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1. Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering

Author: G.D. Alexeev, M.G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badelek, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, C. Braun, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, F. Del Carro, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, C. Elia, D. Eremeev, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, D. Miura, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, D. Neyret, M. Niemiec, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, G. Pesaro, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, F. Sozzi, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki
Subjects: SIDIS, Di-hadron, Spin, Fragmentation, Transversity, Collins effect, Physics, QC1-999
Abstract: A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected in the years 2003–2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160GeV/c at the CERN SPS were analysed. The asymmetries provide access to the transversity distribution functions via a fragmentation function that in principle may be independently obtained from e+e− annihilation data. Results are presented, discussed and compared to existing measurements as well as to model predictions. Asymmetries of π+π− pairs measured with the proton target as a function of the Bjorken scaling variable are sizeable in the range x>0.032, indicating non-vanishing transversity distribution and di-hadron interference fragmentation functions. As already pointed out by several authors, the small asymmetries of π+π− measured on the 6LiD target can be interpreted as indication for a cancellation of u and d-quark transversity distributions.
Published: 2023
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2. Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of ρ0 mesons

Author: G.D. Alexeev, M.G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badelek, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, F. Del Carro, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, C. Elia, D. Eremeev, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, D. Miura, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, F. Sozzi, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki
Subjects: SIDIS, Spin, Fragmentation, Collins asymmetry, Sivers asymmetry, Physics, QC1-999
Abstract: The production of vector mesons in deep inelastic scattering is an interesting yet scarcely explored channel to study the transverse spin structure of the nucleon and the spin-dependence of fragmentation. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced ρ0 mesons. The analysis is based on the data set collected in deep inelastic scattering in 2010 using a 160GeV/c μ+ beam impinging on a transversely polarized NH3 target. The ρ0 mesons are selected from oppositely charged hadron pairs, and the asymmetries are extracted as a function of the Bjorken-x variable, the transverse momentum of the pair and the fraction of the energy z carried by the pair. Indications for positive Collins and Sivers asymmetries are observed.
Published: 2023
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3. Double J/ψ production in pion-nucleon scattering at COMPASS

Author: G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, D. Eremeev, P.D. Eversheim, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, C. Franco, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, S. Groote, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, Yu.A. Khokhlov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, S. Koshkarev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki
Subjects: COMPASS, Charmonia production, Double J/ψ, Single parton scattering, Intrinsic charm, Physics, QC1-999
Abstract: We present the study of the production of double J/ψ mesons using COMPASS data collected with a 190 GeV/c π− beam scattering off NH3, Al and W targets. Kinematic distributions of the collected double J/ψ events are analysed, and the double J/ψ production cross section is estimated for each of the COMPASS targets. The NH3 results are compared to predictions from single- and double-parton scattering models as well as the pion intrinsic charm and the tetraquark exotic resonance hypotheses. It is demonstrated that the single parton scattering production mechanism gives the dominant contribution that is sufficient to describe the data. An upper limit on the double intrinsic charm content of the pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double J/ψ mass spectrum.
Published: 2023
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4. Probing transversity by measuring Λ polarisation in SIDIS

Author: G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, C. Elia, D. Eremeev, P.D. Eversheim, P. Faccioli, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, C. Franco, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, D.-H. Kang, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, T.S. Negrini, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki
Subjects: Quantum chromodynamics, Deep inelastic scattering, Lambda polarisation, Transversity, COMPASS, Physics, QC1-999
Abstract: Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions h1q are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of Λ hyperons produced in SIDIS off transversely polarised nucleons, where the transverse polarisation of the struck quark might be transferred to the final-state hyperon. In this article, we present the COMPASS results on the transversity-induced polarisation of Λ and Λ¯ hyperons produced in SIDIS off transversely polarised protons. Within the experimental uncertainties, no significant deviation from zero was observed. The results are discussed in the context of different models taking into account previous experimental results on h1u and h1d.
Published: 2022
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5. Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

Author: R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, E. Burtin, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured μ+ and μ− cross sections for deeply virtual Compton scattering on the squared four-momentum transfer t from the initial to the final proton. The slope B of the t-dependence is fitted with a single exponential function, which yields B=(4.3±0.6stat|sys−0.3+0.1)(GeV/c)−2. This result can be converted into a transverse extension of partons in the proton, 〈r⊥2〉=(0.58±0.04stat|sys−0.02+0.01±0.04model)fm. For this measurement, the average virtuality of the photon mediating the interaction is 〈Q2〉=1.8(GeV/c)2 and the average value of the Bjorken variable is 〈xBj〉=0.056. Keywords: Quantum chromodynamics, Deep inelastic scattering, Exclusive reactions, Deeply virtual Compton scattering, Generalized Parton Distributions, Proton size, COMPASS
Published: 2019
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6. Measurement of PT-weighted Sivers asymmetries in leptoproduction of hadrons

Author: M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, V. Barone, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, A.A. Lednev, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, Y. Zhao, E. Zemlyanichkina, and M. Ziembicki
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum PT, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. Using the high-statistics data collected by the COMPASS Collaboration in 2010 with a transversely polarised proton target, we have evaluated two types of PT-weighted Sivers asymmetries, which are both proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetries and used to extract the first transverse moments of the Sivers distributions for u and d quarks.
Published: 2019
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7. Corrigendum to 'Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c' [Phys. Lett. B 740 (2015) 303–311]

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180∘ is required for the phases with respect to the L=2,M=1 wave, of the following waves: L=1,3,5 with M=1, and L=2 with M=2. After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η(′) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η(′)π− center-of-mass system and the y-axis pointing in the direction of precoilGJ×pbeamGJ.
Published: 2020
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8. Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS

Author: G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, C. Franco, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavičková, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki
Subjects: Quantum chromodynamics, pQCD, Deep-inelastic scattering, Hadron multiplicities, COMPASS, Physics, QC1-999
Abstract: The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, for the first time, for antiprotons and protons. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2 > 1 (GeV/c)2 for the photon virtuality and W>5 GeV/c2 for the invariant mass of the produced hadronic system. Bjorken-x is restricted to the range 0.01 to 0.40. Protons and antiprotons are identified in the momentum range from 20 GeV/c to 60 GeV/c and required to carry a large fraction of the virtual-photon energy, z>0.5. In the whole studied z-region, the p¯ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Kaons were previously analysed in the momentum range 12 GeV/c to 40 GeV/c. In the present analysis this range is extended up to 55 GeV/c, whereby events with larger virtual-photon energies are included in the analysis and the observed K− over K+ ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that at COMPASS energies the phase space available for single-hadron production in deep-inelastic scattering should be taken into account in the standard pQCD formalism.
Published: 2020
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9. Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Author: J. Agarwala, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a 6LiD target. In both cases, the amplitudes of the cos⁡ϕh and cos⁡2ϕh modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of z, the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero cos⁡2ϕh modulation gives indication for a non-zero Boer-Mulders effect.
Published: 2020
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10. Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Author: M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, C. Naim, A. Nagaytsev, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Silva, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki
Subjects: Quantum chromodynamics, Muoproduction, Hard exclusive meson production, Generalised Parton Distributions, COMPASS, Physics, QC1-999
Abstract: We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ− cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2
Published: 2020
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11. K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Author: R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, G. Pesaro, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, R. Windmolders, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2>1(GeV/c)2 for the photon virtuality and W>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.010.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.
Published: 2018
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12. Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q2

Author: M. Aghasyan, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, J. Veloso, A. Vidon, M. Virius, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photon virtualities 0.006(GeV/c)2
Published: 2018
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13. New analysis of ηπ tensor resonances measured at the COMPASS experiment

Author: A. Jackura, C. Fernández-Ramírez, M. Mikhasenko, A. Pilloni, V. Mathieu, J. Nys, V. Pauk, A.P. Szczepaniak, G. Fox, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, J. Veloso, A. Vidon, M. Virius, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: We present a new amplitude analysis of the ηπ D-wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.
Published: 2018
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14. First measurement of the Sivers asymmetry for gluons using SIDIS data

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, A. Vauth, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink
Subjects: Deep inelastic scattering, Gluon, Sivers, TMD, PDF, Physics, QC1-999
Abstract: The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.
Published: 2017
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15. Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink
Subjects: SIDIS, Drell–Yan, Spin, Azimuthal asymmetries, Sivers, TMDs, Physics, QC1-999
Abstract: Eight proton transverse-spin-dependent azimuthal asymmetries are extracted in four regions of the photon virtuality Q2 from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon–nucleon scattering. These Q2 regions correspond to the four regions of the di-muon mass Q2 used in the ongoing analyses of the COMPASS Drell–Yan measurements, which allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. In addition, for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function various two-dimensional kinematic dependences are presented. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics.
Published: 2017
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16. Final COMPASS results on the deuteron spin-dependent structure function g1d and the Bjorken sum rule

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, A. Vauth, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink
Subjects: COMPASS, Deep inelastic scattering, Spin, Structure function, Parton helicity distributions, Physics, QC1-999
Abstract: Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a 6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)24GeV/c2 in the mass of the hadronic final state. The deuteron double-spin asymmetry A1d and the deuteron longitudinal-spin structure function g1d are presented in bins of x and Q2. Towards lowest accessible values of x, g1d decreases and becomes consistent with zero within uncertainties. The presented final g1d values together with the recently published final g1p values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1 world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour-singlet axial charge a0, which is identified in the MS‾ renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2=3(GeV/c)2)=0.32±0.02stat±0.04syst±0.05evol. Together with the recent results on the proton spin structure function g1p, the results on g1d constitute the COMPASS legacy on the measurements of g1 through inclusive spin-dependent deep inelastic scattering.
Published: 2017
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17. Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink
Subjects: Deep inelastic scattering, Kaon multiplicities, Quark fragmentation functions, Strange quark, Physics, QC1-999
Abstract: Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6LiD target. They cover the kinematic domain 1(GeV/c)25 GeV/c2 in the invariant mass of the hadronic system. The results from the sum of the z-integrated K+ and K− multiplicities at high x point to a value of the non-strange quark fragmentation function larger than obtained by the earlier DSS fit.
Published: 2017
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18. Exclusive ω meson muoproduction on transversely polarised protons

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, R. Heitz, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, E. Seder, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)2
Published: 2017
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19. Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

Author: C. Adolph, M. Aghasyan, R. Akhunzyanov, G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, R. Heitz, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, R. Kuhn, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, E. Seder, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink
Subjects: Deep inelastic scattering, Pion multiplicities, Fragmentation functions, Physics, QC1-999
Abstract: Multiplicities of charged pions and charged hadrons produced in deep-inelastic scattering were measured in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y and the relative hadron energy z. Data were obtained by the COMPASS Collaboration using a 160GeV muon beam and an isoscalar target (6LiD). They cover the kinematic domain in the photon virtuality Q2>1(GeV/c)2, 0.004
Published: 2017
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20. Interplay among transversity induced asymmetries in hadron leptoproduction

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, N. d'Hose, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, G. Pesaro, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows quantitative relationships to be established among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.
Published: 2016
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21. Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, R. Kuhn, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: COMPASS, Deep inelastic scattering, Double spin asymmetry, High pT, ΔG, Physics, QC1-999
Abstract: We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2
Published: 2016
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22. The spin structure function g1p of the proton and a test of the Bjorken sum rule

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, C. Azevedo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, W.-C. Chang, M. Chiosso, I. Choi, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse-Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C. -Yu Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, R. Windmolders, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: New results for the double spin asymmetry A1p and the proton longitudinal spin structure function g1p are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g1p(x) by about a factor of two in the region x≲0.02. A next-to-leading order QCD fit to the g1 world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, ΔΣ, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g1p. The uncertainty of ΔΣ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g1NS(x,Q2) yields as ratio of the axial and vector coupling constants |gA/gV|=1.22±0.05 (stat.)±0.10 (syst.), which validates the sum rule to an accuracy of about 9%.
Published: 2016
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23. Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, G. Pesaro, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.
Published: 2015
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24. Search for exclusive photoproduction of Zc±(3900) at COMPASS

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ±. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN of 3.7×10−3 has been established at the confidence level of 90%. Keywords: COMPASS, Zc(3900), Photoproduction, Tetraquark
Published: 2015
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25. Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: Exclusive production of ηπ− and η′π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η′π− over ηπ− is found for the L=1,3,5 waves, which carry non-qq¯ quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in η′π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L=2 are different.
Published: 2015
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26. Viscosupplementation of hyaluronic acid gels in case of osteoarthritis

Author: Mubarakshina O.A. Mubarakshina, Peshekhonov D.V. Peshekhonov, Peshekhonov L.K. Peshekhonov, Somova M.N. Somova, and Batishcheva G.A. Batishcheva
Subjects: chemistry.chemical_compound, chemistry, business.industry, Hyaluronic acid, Medicine, Viscosupplementation, Osteoarthritis, Pharmacology, business, medicine.disease
Published: 2020
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27. Straw Chambers for the NA64 Experiment

Author: V. M. Lysan, V. A. Kramarenko, G. D. Kekelidze, D.V. Peshekhonov, A. A. Solin, V. Yu. Volkov, T. Enik, Petr Volkov, and A. V. Solin
Subjects: Physics, Straw tube, Nuclear and High Energy Physics, Radiation, Large Hadron Collider, Physics::Instrumentation and Detectors, Dark matter, Mechanical engineering, Straw, Atomic and Molecular Physics, and Optics, Task (computing), High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, Nuclear Experiment
Abstract: The aim of this work is to describe the characteristics and properties of the particle-tracking detectors created at the Joint Institute for Nuclear Research by the glued straw tube technology for the NA64 experiment on the extracted electron beam of the CERN SPS. The physical task of the experiment is to search for phenomena of the dark sector and dark matter.
Published: 2019
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28. Constraints on New Physics in Electron g−2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector

Author: B. Radics, Rimsky Alejandro Rojas, S. V. Kuleshov, L. Molina Bueno, Dipanwita Banerjee, A. N. Toropin, A. Yu. Trifonov, B. Ketzer, A. V. Dermenev, Petr Volkov, M. Kirsanov, V. A. Kramarenko, Valery E. Lyubovitskij, L. Kravchuk, Viktor Matveev, V.N. Kolosov, V.D. Samoylenko, V. Yu. Volkov, Sergey Kovalenko, David R. Cooke, E. Depero, Nikolaos Charitonidis, S. Gerassimov, T. Enik, A. Gardikiotis, V.E. Burtsev, V. M. Lysan, N. V. Krasnikov, A.G. Chumakov, Yu Andreev, D. Shchukin, Vassili Kachanov, V. O. Tikhomirov, André Rubbia, Igor Konorov, B.I. Vasilishin, D. V. Kirpichnikov, Paolo Crivelli, R.R. Dusaev, D.V. Peshekhonov, A. Feshchenko, Vladimir Frolov, G. D. Kekelidze, Johannes Bernhard, V.A. Polyakov, M. Hösgen, Sergei Gninenko, H. Sieber, I. Tlisova, Yu. V. Mikhailov, S. V. Donskov, and A. E. Karneyeu
Subjects: Physics, Particle physics, Anomalous magnetic dipole moment, Scalar (mathematics), General Physics and Astronomy, Fine-structure constant, Electron, Coupling (probability), 7. Clean energy, 01 natural sciences, Pseudoscalar, 0103 physical sciences, 010306 general physics, Pseudovector, Boson
Abstract: We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e^{-}Z→e^{-}ZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such a process was found in the full NA64 dataset of 2.84×10^{11} electrons on target. We place new bounds on the S, P, V, A coupling strengths to electrons, and set constraints on their contributions to the electron anomalous magnetic moment a_{e}, |Δa_{X}|≲10^{-15}-10^{-13} for the X mass region 1 MeV≲m_{X}≲1 GeV. These results are an order of magnitude more sensitive compared to the current accuracy on a_{e} from the electron g-2 experiments and recent high-precision determination of the fine structure constant.
Published: 2021
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29. Corrigendum to 'Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c' [Phys. Lett. B 740 (2015) 303–311]

Author: S. Takekawa, L. Steiger, E. M. Kabuß, R. Panknin, I.A. Savin, N.S. Rossiyskaya, A. Srnka, A. Grasso, Frank Klein, Yu. Kisselev, M. Ostrick, E.R. Bielert, M. Boer, S. Ramos, M. Wilfert, S.-U. Chung, F. Tessarotto, J. Pretz, S.S. Dasgupta, S. Neubert, V. Anosov, S. Gerassimov, D.V. Peshekhonov, C. Quintans, N. Horikawa, M. Büchele, P. Sznajder, H. Wollny, P. Jörg, M. V. Zavertyaev, François Herrmann, Yu. Ivanshin, O.Yu. Shevchenko, S. Levorato, C. Braun, Z.V. Kroumchtein, B. Badelek, M. Stolarski, J.H. Koivuniemi, T. Iwata, M. Krämer, T. Szameitat, Asher Berlin, Fabrice Gautheron, S. Tessaro, D. Hahne, C. Marchand, D.I. Ryabchikov, M. A. Faessler, M. Gorzellik, Ch. Höppner, T. Nagel, A. Lehmann, C. Regali, O. Kouznetsov, K. Königsmann, Miroslav Sulc, R. Joosten, F. Hinterberger, B. Ketzer, R. Sulej, Yu.A. Khokhlov, J. Novy, A. Rychter, M. Chiosso, Franco Bradamante, F. Haas, O.P. Gavrichtchouk, I. Gnesi, Martin Bodlak, R. Hashimoto, R.P. Kurjata, M. Slunecka, R. Akhunzyanov, Y. Miyachi, L. Sinha, K. Klimaszewski, T. Matsuda, R. Geyer, M. Ziembicki, M. Finger, S. Sarkar, Laura Silva, A. Maggiora, A. Zink, I. Konorov, B. Gobbo, G. D. Alexeev, Aram Kotzinian, W. Dünnweber, V.N. Kolosov, K. Schönning, A.A. Lednev, K. Kurek, W. Meyer, Maria Liz Crespo, Lei Wang, M. Virius, T. Michigami, V. Jary, F. H. Heinsius, Federica Sozzi, S. Schopferer, R. Windmolders, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, L. Capozza, K. Kondo, S. Goertz, P. Schiavon, Mikhail Mikhasenko, S. Grabmüller, K. Bicker, A.B. Ivanov, S. V. Donskov, A. Magnon, Y. Bedfer, S. Sosio, O.Yu. Denisov, F. Kunne, R. Jahn, S. Dalla Torre, V. Duic, A. Sandacz, Alessandro Bressan, D. von Harrach, A. Austregesilo, C. Elia, G.V. Khaustov, G. Baum, G.V. Meshcheryakov, A.S. Nunes, Bakur Parsamyan, P.D. Eversheim, W. Eyrich, P. Jasinski, D. Panzieri, Janusz Marzec, M.G. Alexeev, S. Uhl, R. Beck, B. Grube, H. Suzuki, Nour Makke, J. Bieling, H. Matsuda, T. Grussenmeyer, M. Quaresma, Michal Dziewiecki, S. Platchkov, Yu. V. Mikhailov, Christian Schill, J. ter Wolbeek, C. Franco, J. Pochodzalla, Jan Matousek, S. Sirtl, A.G. Olshevsky, Andrea Ferrero, F. Nerling, Q. Curiel, R. Birsa, J. Lichtenstadt, M. Levillain, D. Neyret, W.-D. Nowak, H. Schmieden, P. Bordalo, F. Thibaud, J. Barth, V. Frolov, Soumen Paul, J.M. Friedrich, N. Kuchinski, J. Bisplinghoff, Gerhard K. Mallot, K. Schmidt, Norihiro Doshita, S. Huber, Matthias Schott, Anne-Laure Martin, T. Weisrock, N. d'Hose, E. Zemlyanichkina, E. Burtin, V.F. Konstantinov, S. Ishimoto, H. Fischer, V. Andrieux, Adam Szabelski, A. Nagaytsev, F. Balestra, K. Zaremba, V.A. Polyakov, G. Sbrizzai, A. Amoroso, N. du Fresne von Hohenesche, T. Schlüter, E. Rocco, C. Adolph, Johannes Bernhard, A.V. Efremov, A. Guskov, and I. Uman
Subjects: Physics, Nuclear and High Energy Physics, Angular distribution, Recoil, Coordinate system, Phase (waves), Atomic physics, Beam (structure), lcsh:Physics, lcsh:QC1-999
Abstract: In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180 ∘ is required for the phases with respect to the L = 2 , M = 1 wave, of the following waves: L = 1 , 3 , 5 with M = 1 , and L = 2 with M = 2 . After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η ( ′ ) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η ( ′ ) π − center-of-mass system and the y-axis pointing in the direction of p recoil GJ × p beam GJ .
Published: 2020

30. Spin Density Matrix Elements in Exclusive $\omega$ Meson Muoproduction $^*$

Author: Johannes Bernhard, Ch. Dreisbach, A. Guskov, W.-D. Nowak, C. Quintans, G. Nukazuka, Marcin Stolarski, D. D'Ago, C. Naim, F. Tosello, Pietro Faccioli, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, A. Srnka, G.V. Meshcheryakov, Yu. V. Mikhailov, Andrea Ferrero, G. D. Alexeev, Franco Bradamante, M. Faessler, P. Jörg, Arseniy Rybnikov, B. Badelek, Norihiro Doshita, N. d'Hose, B.M. Veit, O.P. Gavrichtchouk, Martin Bodlak, B. Ketzer, S. Gerassimov, N. Horikawa, Jen-Chieh Peng, J. Smolik, S.S. Dasgupta, R. Heitz, L. Sinha, O. Subrt, K. Zaremba, H. Schmieden, E. M. Kabuß, S.A. Mamon, T. Matsuda, A. Townsend, J.M. Friedrich, V.A. Polyakov, Y. Miyachi, A. Gridin, D.I. Ryabchikov, S. Sarkar, A.B. Ivanov, V.E. Burtsev, S. Huber, N. Mitrofanov, S. Tessaro, Yakov Petrovich Kulinich, G. Sbrizzai, Alexandr Selyunin, Yuxiang Zhao, A. Vauth, M. Wagner, Alessandro Bressan, D. von Harrach, F. Krinner, E. Zemlyanichkina, M.G. Alexeev, A. Amoroso, Yu.A. Khokhlov, J. Pochodzalla, S. Uhl, O.Yu. Denisov, J. Giarra, D. Neyret, Andres Cicuttin, A. Moretti, V.D. Samoylenko, C. Regali, I.A. Savin, Nour Makke, A. Sandacz, J. Nový, M. Chiosso, Naomi C R Makins, Yu. Kisselev, T. Iwata, R. Joosten, G. Reicherz, A. Maltsev, W. C. Chang, F. Gautheron, A. Vidon, B. Marianski, J. Barth, J.F.C.A. Veloso, A. Rychter, M. Finger, Bakur Parsamyan, J.H. Koivuniemi, K. Kurek, V.N. Kolosov, C. Chatterjee, M. Gorzellik, M. Ostrick, I. Denisenko, S. Dalla Torre, Gerhard K. Mallot, Y.-S. Lian, R. Beck, A. Kerbizi, A. Magnon, M. Quaresma, M. Slunečka, M. Pešková, M. Meyer, M. V. Zavertyaev, O.M. Kouznetsov, Anne-Laure Martin, C.-Y. Hsieh, V. Frolov, H. Pekeler, M. Virius, A.G. Chumakov, Miroslav Sulc, Antonin Kveton, D.V. Peshekhonov, W. Augustyniak, Aram Kotzinian, S. Platchkov, P. Zavada, M. Ziembicki, C. Franco, F. Tessarotto, Soumen Paul, R.P. Kurjata, B.I. Vasilishin, Jan Tomsa, M. Grosse Perdekamp, P.M.M. Correia, I. Konorov, P. Sznajder, J. Pretz, A. Antoshkin, M. Jandek, V.F. Konstantinov, W. Meyer, Maria Liz Crespo, F. Kaspar, D. Steffen, K. Lavickova, A. Grasso, V. Andrieux, A.V. Efremov, I. Gnesi, S. Wallner, Y. Bedfer, R. Longo, Kamil Augsten, V. Jary, S. Ishimoto, H. Fischer, A. Thiel, Valery E. Lyubovitskij, A.G. Olshevsky, G.V. Khaustov, A. Maggiora, S. Levorato, S. Dasgupta, Frank Klein, Jan Matousek, Mikhail Mikhasenko, S. V. Donskov, M. Pešek, F. Kunne, Markus Ball, R.R. Dusaev, V. Tskhay, A.S. Nunes, D. Panzieri, Janusz Marzec, E. Mitrofanov, T. Szameitat, A. Koval, J. Lichtenstadt, B. Ventura, B. Grube, M. Zemko, S.-U. Chung, François Herrmann, P.-J. Lin, K. Kondo Horikawa, G. Mattson, V. Anosov, Z. Kral, J. Berenguer Antequera, W. Dünnweber, A. Nagaytsev, F. Balestra, N. Pierre, T. Rudnicki, C. Riedl, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Antequera, J. Berenguer, Bernhard, J., Bodlak, M., Bradamante, F., Bressan, A., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Correia, P. M. M., Crespo, M. L., D’Ago, D., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisenko, I., Denisov, O. Yu., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., Faccioli, P., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Guskov, A., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D’Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, V., Jörg, P., Joosten, R., Kabuß, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Horikawa, K. Kondo, Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Koval, A., Kral, Z., Krinner, F., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lavickova, K., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Lin, P. -J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Maltsev, A., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, T., Mattson, G., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Nový, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pešek, M., Peshekhonov, D. V., Pešková, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Regali, C., Reicherz, G., Riedl, C., Rudnicki, T., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmieden, H., Selyunin, A., Sinha, L., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szameitat, T., Sznajder, P., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Ventura, B., Vidon, A., Virius, M., Wagner, M., Wallner, S., Zaremba, K., Zavada, P., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., and Ziembicki, M.
Subjects: virtual [photon], generalized parton distribution, Physics and Astronomy (miscellaneous), Hadron, parton: distribution function, Virtual particle, Parton, SDME, COMPASS, 01 natural sciences, Omega, High Energy Physics - Experiment, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], spin: density matrix, Nuclear Experiment, Quantum chromodynamics, Physics, density matrix [spin], vector meson, helicity: conservation law, Helicity, kinematics, omega(783): production, Production (computer science), distribution function [parton], Particle Physics - Experiment, exclusive reaction, Particle physics, liquid: target [hydrogen], Meson, polarization: longitudinal, lcsh:Astrophysics, +muon+p+omega%28783%29%22">muon p --> muon p omega(783), transverse momentum, meson, hydrogen: liquid: target, lcsh:QB460-466, 0103 physical sciences, polarization: transverse, ddc:530, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous), DIS, background, muon: beam, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, conservation law [helicity], Automatic Keywords, lcsh:QC770-798, High Energy Physics::Experiment, experimental results, photon: virtual
Abstract: We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $\omega$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ \mu ^{+}$ and $ \mu ^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W, Comment: 31 pages, 12 figures, 1 appendix
Published: 2020
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31. K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Author: S. Gerassimov, N. Horikawa, A. Srnka, A.G. Olshevsky, A. Rychter, F. Tosello, S. Tessaro, D. Hahne, R. Longo, M. Wilfert, V.N. Kolosov, L. Capozza, K. Kondo, F. Krinner, Yu.A. Khokhlov, Y.-S. Lian, C. Quintans, Alexandr Selyunin, Andrea Ferrero, I. Konorov, Y. Bedfer, K. Zaremba, C. Regali, C. Chatterjee, T. Sawada, Norihiro Doshita, V.A. Polyakov, Nour Makke, W. C. Chang, N. d'Hose, F. Kunne, Valery E. Lyubovitskij, C. Franco, R.R. Dusaev, V. Tskhay, Z.V. Kroumchtein, M. Chiosso, G. Sbrizzai, M. Quaresma, J. Barth, J. Smolik, E. Seder, J.F.C.A. Veloso, S.A. Mamon, O. Subrt, A. Amoroso, C.-Y. Hsieh, L. Dhara, B. Badełek, M. Ziembicki, Franco Bradamante, F. Pereira, N. du Fresne von Hohenesche, O.M. Kouznetsov, M. Stolarski, T. Szameitat, M. Grosse Perdekamp, B.M. Veit, A. Grasso, A. Gridin, A. Vidon, B. Marianski, Bakur Parsamyan, W. Augustyniak, S. Ramos, D.V. Peshekhonov, G. Pesaro, S. Platchkov, P. Zavada, Maria Liz Crespo, Miroslav Sulc, A. Kveton, Y. Miyachi, A.A. Lednev, P. Schiavon, M. A. Faessler, G.V. Khaustov, V. Frolov, B. Ketzer, Soumen Paul, R. Birsa, Jen-Chieh Peng, J. Lichtenstadt, P. Sznajder, J. Pochodzalla, V. Jary, Anne-Laure Martin, P. Jörg, S.S. Dasgupta, I. Gnesi, H. Schmieden, D. Steffen, Andrew Ivanov, S. Sarkar, Yu. Kisselev, O.P. Gavrichtchouk, Martin Bodlak, J.M. Friedrich, A. Sandacz, A. Vauth, H. Matsuda, R. Salac, M. Ostrick, S. Levorato, L. Sinha, T. Matsuda, D. Neyret, S. Dasgupta, A. Austregesilo, P. Bordalo, R. Akhunzyanov, Laura Silva, V.F. Konstantinov, Yakov Petrovich Kulinich, E.R. Bielert, D.I. Ryabchikov, A. Thiel, Q. Curiel, V.E. Burtsev, N. Mitrofanov, S. Huber, S. Wallner, E.A. Levchenko, S. Ishimoto, D. von Harrach, H. Fischer, E. M. Kabuß, E. Zemlyanichkina, Naomi C R Makins, G. D. Alexeev, R.P. Kurjata, Jan Tomsa, M. V. Zavertyaev, W. Dünnweber, K. Bicker, I.A. Savin, C. Marchand, M. Büchele, M.G. Alexeev, M. Krämer, S. Uhl, M. Finger, G. Hamar, J. Giarra, A.V. Efremov, Ilya Kuznetsov, J.H. Koivuniemi, Michal Dziewiecki, Andres Cicuttin, A. Moretti, I. Orlov, V.D. Samoylenko, Jan Matousek, G. Reicherz, Nikolay Anfimov, M. Pešková, M. Gorzellik, R. Heitz, M. Virius, J. Nový, R. Joosten, O.Yu. Denisov, Z. Kral, S. Dalla Torre, A. Antoshkin, P.D. Eversheim, F. Klein, Kamil Augsten, S.-U. Chung, G.V. Meshcheryakov, H. Suzuki, C.D.R. Azevedo, Yu. V. Mikhailov, R. Beck, A. Kerbizi, S. Sirtl, A. Maggiora, F. Tessarotto, Mikhail Mikhasenko, F. Nerling, François Herrmann, B. Grube, Johannes Bernhard, Ch. Dreisbach, S. V. Donskov, A. Guskov, M. Pešek, A.S. Nunes, Andrea Bressan, Markus Ball, D. Panzieri, Janusz Marzec, M. Tasevsky, E. Mitrofanov, G. Nukazuka, M. Slunecka, A. Magnon, Takahiro Iwata, Federica Sozzi, W. Meyer, K. Kurek, Gerhard K. Mallot, Aram Kotzinian, R. Windmolders, B.I. Vasilishin, M. Meyer, A.G. Chumakov, J. Pretz, Arseniy Rybnikov, W.-D. Nowak, V. Anosov, V. Andrieux, Adam Szabelski, A. Nagaytsev, F. Balestra, N. Pierre, F. Gautheron, C. Riedl, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Burtsev, V. E., Capozza, L., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krämer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kuznetsov, I. I., Kveton, A., Lednev, A. A., Levchenko, E. A., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Mamon, S. A., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesaro, G., Pešek, M., Pešková, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmieden, H., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wallner, S., Wilfert, M., Windmolders, R., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., and Ziembicki, M.
Subjects: Hadron, 0 [higher-order], target: isoscalar, 01 natural sciences, COMPASS, deep inelastic scattering [muon+ nucleon], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), K: multiplicity, High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], isoscalar [target], Invariant mass, Nuclear Experiment, Boson, Physics, Quantum chromodynamics, quark: fragmentation function, higher-order: 0, photon, perturbation theory: higher-order, hep-ph, мюоны, lcsh:QC1-999, Bjorken [scaling], High Energy Physics - Phenomenology, beam [muon], рассеяние, factorization [cross section], multiplicity [pi], Particle Physics - Experiment, perturbation theory [quantum chromodynamics], Particle physics, Nuclear and High Energy Physics, Meson, FOS: Physical sciences, ratio [multiplicity], fragmentation function [quark], x-dependence, scaling: Bjorken, charged particle: multiplicity, phase space, multiplicity [charged particle], [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], виртуальные фотоны, 0103 physical sciences, ddc:530, universality, quantum chromodynamics: perturbation theory, 010306 general physics, Particle Physics - Phenomenology, muon+ nucleon: deep inelastic scattering, Muon, multiplicity: ratio, pi: multiplicity, 010308 nuclear & particles physics, hep-ex, muon: beam, Multiplicity (mathematics), cross section: factorization, CERN SPS, Deep inelastic scattering, higher-order [perturbation theory], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], каоны, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, multiplicity [K], hadronization, lcsh:Physics, experimental results
Abstract: The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2>1$ (GeV/$c)^2$ for the photon virtuality and $W>5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/$c$ to 40 GeV/$c$, thereby restricting the range in Bjorken-$x$ to $0.010.75$. For very large values of $z$, $i.e.$ $z>0.8$, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation., Comment: 16 pages, 7 figures
Published: 2018
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32. Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

Author: L. Silva, S.S. Dasgupta, A.G. Chumakov, J. Nový, Y. Miyachi, P.D. Eversheim, P. Zavada, E. Zemlyanichkina, François Herrmann, S. Uhl, Y. Bedfer, A. Antoshkin, G. Sbrizzai, N.S. Rogacheva, A. Ferrero, G.V. Khaustov, A. Magnon, F. Pereira, I. Konorov, J. ter Wolbeek, Maria Liz Crespo, C. Regali, J. Marzec, A. Kveton, G.D. Alexeev, K. Schmidt, P. Kremser, O.Yu. Denisov, F. Gautheron, F. Nerling, Yu.A. Khokhlov, K. Kondo, N. C. R. Makins, M. Faessler, V.N. Kolosov, A. Amoroso, H. Matsuda, D. Neyret, C.D.R. Azevedo, V. Jary, V. Anosov, M. Grosse Perdekamp, S. Sarkar, Y.-S. Lian, R. Beck, A. Selyunin, B. Grube, M. Stolarski, M. Tasevsky, T. Sawada, N. Horikawa, M. Sulc, S. Tessaro, D. Hahne, V.D. Samoylenko, J. Giarra, N. d'Hose, W. Meyer, R. Joosten, Andres Cicuttin, O. Subrt, S. Wallner, S. Platchkov, R. Salac, Jen-Chieh Peng, V.A. Polyakov, J. Veloso, N. Zhuravlev, G.V. Meshcheryakov, A. Sandacz, M. Virius, F. H. Heinsius, S. Ishimoto, M. Aghasyan, A.M. Kotzinian, M. Zavertyaev, Jan Matousek, G. Reicherz, S. Dalla Torre, C. Quintans, M. Pešek, J. Barth, Alan D. Martin, M. Chiosso, N.V. Anfimov, Jan Tomsa, M. Ostrick, R.P. Kurjata, M. Finger, E. Kabuß, R.R. Dusaev, A.S. Nunes, T. Weisrock, R. Birsa, K. Augsten, V. Frolov, A. Maggiora, A. Vauth, A.A. Lednev, V.E. Lyubovitskij, C. Chatterjee, P. Jörg, Yakov Petrovich Kulinich, Gerhard K. Mallot, Andrey Ivanov, Frank Klein, P. Bordalo, A. Nagaytsev, Johannes Bernhard, Ch. Dreisbach, D. Panzieri, K. Zaremba, E.R. Bielert, Markus F. Krämer, J. Pochodzalla, K. Königsmann, M. Slunecka, A. Guskov, J.M. Friedrich, A. Srnka, H. Suzuki, S. Dasgupta, B. Marianski, T. Grussenmeyer, A. Rybnikov, Andrea Bressan, Anatoli Vasilievich Efremov, L. Dhara, T. Matsuda, M. Meyer, M. Dziewiecki, Markus Ball, M. Gorzellik, W.-D. Nowak, Yu. Kisselev, P. Schiavon, C. Santos, E. Mitrofanov, Bakur Parsamyan, W. Dünnweber, Martin Bodlak, Yu. Ivanshin, M.G. Alexeev, Ilya Kuznetsov, W. C. Chang, S.V. Donskov, D. Steffen, M. Wilfert, J. Smolik, K. Bicker, S. Ramos, L. Sinha, J. Pretz, E. Fuchey, S. Levorato, A. Austregesilo, A. Gridin, I. J. Choi, N. Mitrofanov, C. Franco, Stephan M. Paul, M. Levillain, A. Thiel, C. Riedl, V. Andrieux, Mikhail Mikhasenko, F. Krinner, I.A. Savin, O.P. Gavrichtchouk, N. Makke, I. Orlov, A. Szabelski, F. Giordano, E.A. Levchenko, N. du Fresne von Hohenesche, S. Gerassimov, N. Pierre, R. Longo, M. Quaresma, N. Doshita, B. Ketzer, A. Vidon, Yu.V. Mikhailov, I. Gnesi, G. Hamar, V.F. Konstantinov, P. Sznajder, Z. Kral, T. Iwata, B.I. Vasilishin, A. Grasso, V. Tskhay, H. Fischer, M. Ziembicki, M. Büchele, A. Rychter, S. Sirtl, Z.V. Kroumchtein, F. Balestra, S.-U. Chung, F. Tosello, T. Szameitat, D. von Harrach, K. Schönning, F. Tessarotto, J.H. Koivuniemi, Franco Bradamante, A. Kerbizi, J. Lichtenstadt, F. Kunne, M. Pešková, E. Seder, K. Kurek, G. Nukazuka, D.V. Peshekhonov, R. Heitz, O.M. Kouznetsov, V.E. Burtsev, R. Akhunzyanov, S.A. Mamon, H. Schmieden, C.-Y. Hsieh, B. Badełek, W. Augustyniak, D.I. Ryabchikov, A.G. Olshevsky, and S. Huber
Subjects: Physics, Nuclear and High Energy Physics, Muon, Mass distribution, 010308 nuclear & particles physics, Branching fraction, Hadron, State (functional analysis), 01 natural sciences, Momentum, 0103 physical sciences, Tetraquark, Atomic physics, 010306 general physics, X(3872)
Abstract: We have searched for exclusive production of exotic charmonia in the reaction μ + N → μ + ( J / ψ π + π − ) π ± N ′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J / ψ π + π − mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X ( 3872 ) . The shape of the π + π − mass distribution from the observed decay into J / ψ π + π − shows disagreement with previous observations for X ( 3872 ) . The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X ( 3872 ) with C = − 1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J / ψ π + π − is determined to be 71±28(stat)±39(syst) pb.
Published: 2018
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33. Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS

Author: G. D. Alexeev, W. Dünnweber, R. Heitz, O.Yu. Denisov, A. Gridin, M. A. Faessler, W.-D. Nowak, R. Beck, A. Kerbizi, G.V. Meshcheryakov, A. Srnka, Yu. V. Mikhailov, F. Kunne, M. Grosse Perdekamp, C.-Y. Hsieh, V. Frolov, Soumen Paul, A. Grasso, W. Augustyniak, Miroslav Sulc, P. Sznajder, D.V. Peshekhonov, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, T. Matsuda, G. Nukazuka, A. Townsend, D. Steffen, A. Thiel, M. Stolarski, Yu. Kisselev, Pietro Faccioli, F. Tessarotto, Jan Tomsa, M.G. Alexeev, S. Uhl, A.V. Efremov, J. Giarra, I. Gnesi, M. Ostrick, Franco Bradamante, V. Anosov, M. Mikhasenko, A. Rychter, J. Lichtenstadt, Andres Cicuttin, A. Moretti, K. Zaremba, V.D. Samoylenko, V.A. Polyakov, V.N. Kolosov, A.G. Olshevsky, A. Maltsev, M. Quaresma, A.B. Ivanov, Alexandr Selyunin, I. Denisenko, S. Dalla Torre, G. Sbrizzai, M. Zemko, A. Amoroso, Arseniy Rybnikov, Nour Makke, W. C. Chang, D. Neyret, C. Chatterjee, Y. Miyachi, D. D'Ago, C. Naim, Yuxiang Zhao, Johannes Bernhard, Ch. Dreisbach, A. Guskov, B.M. Veit, R.R. Dusaev, M. V. Zavertyaev, V. Tskhay, Anne-Laure Martin, A. Sandacz, Antonin Kveton, C. Franco, B. Badelek, D.I. Ryabchikov, F. Tosello, K. Kondo Horikawa, M. Meyer, G. Mattson, A.G. Chumakov, B. Ketzer, E. M. Kabuß, C. Quintans, V.F. Konstantinov, S. Wallner, Norihiro Doshita, N. d'Hose, J.F.C.A. Veloso, Yakov Petrovich Kulinich, S. Ishimoto, J. Nový, H. Schmieden, I.A. Savin, H. Fischer, A. Antoshkin, M. Slunečka, J.M. Friedrich, J. Smolik, O.M. Kouznetsov, J. Berenguer Antequera, O. Subrt, S. Huber, A. Vidon, B. Marianski, Kamil Augsten, Bakur Parsamyan, J. Pretz, Valery E. Lyubovitskij, E. Zemlyanichkina, S. Platchkov, P. Zavada, R.P. Kurjata, M. Jandek, A. Maggiora, Maria Liz Crespo, K. Lavickova, R. Longo, S. Levorato, Frank Klein, Markus Ball, S.A. Mamon, S. V. Donskov, M. Pešek, V. Jary, A.S. Nunes, A. Koval, B. Ventura, B. Grube, Y.-S. Lian, S. Sarkar, J. Pochodzalla, D. Panzieri, Janusz Marzec, M. Chiosso, Alessandro Bressan, D. von Harrach, F. Kaspar, W. Meyer, K. Kurek, T. Rudnicki, P.M.M. Correia, I. Konorov, Aram Kotzinian, A. Magnon, Jen-Chieh Peng, B.I. Vasilishin, P. Jörg, V.E. Burtsev, F. Gautheron, N. Mitrofanov, Z. Kral, S.S. Dasgupta, A. Nagaytsev, F. Balestra, N. Pierre, Naomi C R Makins, S. Gerassimov, C. Riedl, M. Büchele, A. Vauth, M. Finger, N. Horikawa, J.H. Koivuniemi, T. Iwata, M. Gorzellik, M. Ziembicki, M. Pešková, M. Virius, S. Tessaro, G.V. Khaustov, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, M. Wagner, H. Pekeler, F. Krinner, Yu.A. Khokhlov, J. Barth, Gerhard K. Mallot, R. Joosten, S. Dasgupta, V. Andrieux, S.-U. Chung, Y. Bedfer, E. Mitrofanov, François Herrmann, P.-J. Lin, Jan Matousek, G. Reicherz, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: Proton, Isoscalar, Hadron, 0 [higher-order], Deep-inelastic scattering, target: isoscalar, 01 natural sciences, COMPASS, deep inelastic scattering [muon+ nucleon], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], anti-p: multiplicity, Invariant mass, isoscalar [target], Nuclear Experiment (nucl-ex), Nuclear Experiment, Hadron multiplicities, Quantum chromodynamics, Physics, multiplicity [K+], quark: fragmentation function, higher-order: 0, K+: multiplicity, photon, perturbation theory: higher-order, higher-order: 1, multiplicity [anti-p], lcsh:QC1-999, Bjorken [scaling], beam [muon], factorization [cross section], 1 [higher-order], Particle Physics - Experiment, perturbation theory [quantum chromodynamics], Nuclear and High Energy Physics, FOS: Physical sciences, ratio [multiplicity], pQCD, fragmentation function [quark], scaling: Bjorken, x-dependence, Nuclear physics, phase space, 0103 physical sciences, ddc:530, quantum chromodynamics: perturbation theory, 010306 general physics, muon+ nucleon: deep inelastic scattering, p: multiplicity, Muon, multiplicity [K-], multiplicity: ratio, 010308 nuclear & particles physics, hep-ex, muon: beam, cross section: factorization, CERN SPS, Deep inelastic scattering, multiplicity: measured [charged particle], higher-order [perturbation theory], K-: multiplicity, Antiproton, High Energy Physics::Experiment, lcsh:Physics, charged particle: multiplicity: measured, hadronization, multiplicity [p], experimental results
Abstract: The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2$ > 1 (GeV/$c$)$^2$ for the photon virtuality and $W > 5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. The range in Bjorken-$x$ is restricted to $0.01 < x < 0.40$. Protons and antiprotons are identified in the momentum range $20 ��60$ GeV/$c$. In the whole studied $z$-region, the $\bar{\rm p}$ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Extending our earlier analysis of the K$^-$ over K$^+$ multiplicity ratio by including now events with larger virtual-photon energies, this ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that the phase space available for hadronisation should be taken into account in the pQCD formalism., 19 pages, 7 figures, 3 tables
Published: 2020
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34. Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

Author: C. Quintans, A. Vidon, N. C. R. Makins, E. Fuchey, M. V. Zavertyaev, Nikolay Anfimov, Mikhail Mikhasenko, K. Zaremba, V.A. Polyakov, Y.-S. Lian, Franco Bradamante, R. Joosten, C. Marchand, Alexandr Selyunin, G. Sbrizzai, Jan Matousek, G. Reicherz, M. Levillain, C.-Y. Hsieh, B. Grube, V. Frolov, A. Amoroso, N. du Fresne von Hohenesche, C. Riedl, Aram Kotzinian, Nour Makke, W. C. Chang, S.A. Mamon, P. Schiavon, Soumen Paul, V. Andrieux, H. Schmieden, J.M. Friedrich, Adam Szabelski, S. V. Donskov, M. Pešek, A. Srnka, Z.V. Kroumchtein, M. Quaresma, S.-U. Chung, S. Huber, I. J. Choi, A.S. Nunes, P.D. Eversheim, W. Duennweber, J. Pochodzalla, R. Akhunzyanov, T. Sawada, J. Novy, D. Panzieri, Janusz Marzec, K. Schoennig, R.P. Kurjata, H. Suzuki, C.D.R. Azevedo, H. Matsuda, Ilya Kuznetsov, S. Platchkov, M. Faessler, M. Stolarski, François Herrmann, D.V. Peshekhonov, B.I. Vasilishin, M. Virius, T. Grussenmeyer, F. Tessarotto, E. Zemlyanichkina, P. Bordalo, A. Nagaytsev, F. Balestra, N. Pierre, Andres Cicuttin, A. Moretti, R.R. Dusaev, F. Nerling, V. Tskhay, M. Chiosso, G. Hamar, Frank Klein, M. Kraemer, J. ter Wolbeek, Jan Tomsa, G. D. Alexeev, I.A. Savin, W. Meyer, A.V. Efremov, I. Orlov, V.D. Samoylenko, D.I. Ryabchikov, M. Slunecka, Yu. Kisselev, F. Gautheron, Miroslav Sulc, Markus Ball, Yu. Ivanshin, R. Salac, I. Gnesi, F. Tosello, K. Kurek, M. Ziembicki, M. Ostrick, O.P. Gavrichtchouk, W.-D. Nowak, Martin Bodlak, L. Sinha, M. Buechele, L. Dhara, T. Matsuda, E.R. Bielert, B. Badelek, N. I. Zhuravlev, Norihiro Doshita, M. Meyer, A.G. Chumakov, E. Burtin, A. Maggiora, E.A. Levchenko, B. Ketzer, N. d'Hose, G.V. Meshcheryakov, A. Austregesilo, J. Barth, V.F. Konstantinov, S. Dalla Torre, G.V. Khaustov, A. Rychter, Yu. V. Mikhailov, S. Wallner, R. Longo, V.N. Kolosov, S. Sirtl, J.F.C.A. Veloso, J. Smolik, A. Vauth, O. Subrt, P. Zavada, S. Ishimoto, H. Fischer, Gerhard K. Mallot, J. Pretz, Alan D. Martin, M.G. Alexeev, S. Uhl, A.G. Olshevsky, R. Heitz, A. Grasso, Maria Liz Crespo, Y. Miyachi, A.A. Lednev, O.M. Kouznetsov, J. Giarra, Michal Dziewiecki, M. Grosse Perdekamp, C. Franco, D. Neyret, W. Augustyniak, S. Ramos, M. Gorzellik, V. Jary, F. Pereira, O.Yu. Denisov, S. Gerassimov, N. Horikawa, A. Sandacz, Andrew Ivanov, Arseniy Rybnikov, S. Sarkar, Z. Kral, F. Kunne, T. Szameitat, K. Juraskova, S. Tessaro, D. Hahne, P. Sznajder, N.S. Rogacheva, D. von Harrach, C. Regali, F. Krinner, Yu.A. Khokhlov, B. Marianski, Bakur Parsamyan, D. Steffen, P. Joerg, S. Levorato, R. Beck, A. Kerbizi, V.E. Burtsev, N. Mitrofanov, A. Thiel, M. Tasevsky, E. Mitrofanov, G. Pesaro, A. Gridin, E. Seder, Celso Augusto Guimarães Santos, J. Lichtenstadt, Valery E. Lyubovitskij, M. Finger, R. Birsa, Andrea Ferrero, S. Dasgupta, A. Antoshkin, K. Kondo, Kamil Augsten, Y. Bedfer, C. Chatterjee, V. Anosov, J.H. Koivuniemi, M. Pešková, Jen-Chieh Peng, S.S. Dasgupta, A. Kveton, G. Nukazuka, A. Magnon, I. Konorov, Laura Silva, Yakov Petrovich Kulinich, E. M. Kabuss, Takahiro Iwata, B.M. Veit, K. Bicker, Johannes Bernhard, Ch. Dreisbach, A. Guskov, Andrea Bressan, M. Wilfert, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., Burtin, E., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C., Dunnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y., Iwata, T., Jary, V., Joosten, R., Jorg, P., Juraskova, K., Kabuss, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kramer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kuznetsov, I. I., Kveton, A., Lednev, A. A., Levchenko, E. A., Levillain, M., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Nerling, F., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesek, M., Peskova, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmieden, H., Schonning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wallner, S., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: Photon, generalized parton distribution, muon: polarization, Proton, Generalized Parton Distribution, Parton, measured [cross section], Proton size, nucl-ex, momentum transfer dependence, 01 natural sciences, COMPASS, Subatomär fysik, p: size, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Monte Carlo, Quantum chromodynamics, Physics, Range (particle radiation), photon: production, Generalized Parton Distributions, Deep inelastic scattering, Deeply virtual Compton scattering, Exclusive reactions, Exclusive reaction, lcsh:QC1-999, transverse, beam [muon], slope, size: (transverse), Particle Physics - Experiment, Quark, Nuclear and High Energy Physics, exclusive reaction, slope: (calculated), liquid: target [hydrogen], photon: mediation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, hydrogen: liquid: target, 0103 physical sciences, ddc:530, Nuclear Physics - Experiment, 010306 general physics, beam: polarization, hep-ex, 010308 nuclear & particles physics, muon: beam, 160 GeV/c, +muon+p+photon%22">muon p --> muon p photon, size [p], Compton scattering, cross section: measured, CERN SPS, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, lcsh:Physics, experimental results
Abstract: Physics letters / B B793, 188-194 (2019). doi:10.1016/j.physletb.2019.04.038, Published by North-Holland Publ., Amsterdam
Published: 2019
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35. Resonance production and ππ S -wave in π−+p→π−π−π++precoil at 190 GeV/c

Author: N. Horikawa, Sergey Donskov, R. Jahn, M. Boer, F. Tosello, W-C Chang, S. Platchkov, E. M. Kabuß, S. Tessaro, D. Hahne, E. Fuchey, I.A. Savin, A.A. Lednev, V.D. Samoylenko, W. Augustyniak, S. Ramos, M. Slunečka, F. Krinner, M. Gorzellik, Yu.A. Khokhlov, Jan Matousek, G. Nukazuka, F. Nerling, P. Sznajder, W.-D. Nowak, P.D. Eversheim, Yu.V. Mikhailov, Laura Silva, O.P. Gavrichtchouk, S. Paul, Michael Kramer, H. Suzuki, C.D.R. Azevedo, M. Wilfert, Martin Bodlak, L. Sinha, J. Nový, T. Matsuda, A. Zink, K. Kondo, G.V. Khaustov, Yu. Kisselev, A. Lehmann, Duic, M. Levillain, Takahiro Iwata, M. Pešek, Aram Kotzinian, D.I. Ryabchikov, A.S. Nunes, M. Ostrick, D. Panzieri, J.F.C.A. Veloso, Janusz Marzec, Y. Bedfer, K. Klimaszewski, S. Dasgupta, E.R. Bielert, Johannes Bernhard, A. Guskov, T. Grussenmeyer, K. Zaremba, M. Ziembicki, M. Büchele, K. Schmidt, C. Quintans, W. Meyer, Maria Liz Crespo, K. Bicker, François Herrmann, V.A. Polyakov, I. J. Choi, Andres Cicuttin, I. Orlov, F. H. Heinsius, M.G. Alexeev, S. Uhl, J.H. Koivuniemi, G. Reicherz, C. Regali, Norihiro Doshita, J. ter Wolbeek, M. Grosse Perdekamp, S. Dalla Torre, A. Austregesilo, Michal Dziewiecki, N. d'Hose, N.S. Rossiyskaya, Marcin Stolarski, P. Kremser, T. Szameitat, S. Takekawa, F. Thibaud, J. Barth, Andrew Ivanov, G.V. Meshcheryakov, Adam Szabelski, J. Pretz, S. Sirtl, S. Sarkar, Ferdinando Giordano, A. Grasso, Gerhard K. Mallot, O.Yu. Denisov, D. von Harrach, G. Sbrizzai, O. Kouznetsov, F. Kunne, T. Weisrock, S. U. Chung, I. Konorov, Franco Bradamante, Miroslav Sulc, Federica Sozzi, S. Schopferer, Y. Miyachi, A. Nagaytsev, F. Balestra, F. Hinterberger, R. Joosten, P. Montuenga, A. Magnon, P. Schiavon, P. Jörg, A. Bressan, Andrea Ferrero, T. Michigami, A. Amoroso, V.N. Kolosov, Tskhay, A. Sandacz, O.Yu. Shevchenko, S. Levorato, F. Haas, S.S. Dasgupta, R. Beck, H. Matsuda, Naomi C R Makins, N. du Fresne von Hohenesche, Celso Augusto Guimarães Santos, T. Schlüter, R. Birsa, C. Riedl, M. Finger, R. Akhunzyanov, M. Virius, Anosov, C. Adolph, J. C. Peng, G. D. Alexeev, W. Dünnweber, S. G. Gerassimov, A.V. Efremov, Fabrice Gautheron, M. A. Faessler, H. Schmieden, J.M. Friedrich, N. Kuchinski, A. Srnka, J. Bisplinghoff, S. Huber, Vladimir Nikolaenko, E. Zemlyanichkina, A. Rychter, R. Longo, K. Schönning, C-Y Hsieh, S. Grabmüller, Frolov, Frank Klein, J. Pochodzalla, C. Franco, Anne-Laure Martin, F. A. Pereira, K. Königsmann, Yu. Ivanshin, P. Bordalo, E. Burtin, V.F. Konstantinov, A. Maggiora, L. Dhara, C. Braun, R.P. Kurjata, Andrieux, H. Fischer, B. Badelek, R. Hashimoto, Jary, Z.V. Kroumchtein, M. V. Zavertyaev, B. Ketzer, B. Marianski, Bakur Parsamyan, C. Marchand, A.G. Olshevsky, J. Lichtenstadt, Q. Curiel, D. Neyret, B. Grube, D.V. Peshekhonov, S. Ishimoto, M. Chiosso, I. Gnesi, K. Kurek, Alexandr Selyunin, W. Eyrich, Nour Makke, M. Quaresma, and F. Tessarotto
Subjects: Quantum chromodynamics, Physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, 01 natural sciences, Nuclear physics, Amplitude, Recoil, 0103 physical sciences, S-wave, Pi, Isobar, 010306 general physics
Abstract: The COMPASS collaboration has collected the currently largest data set on diffractively produced pi(-) pi(-) pi(+) final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, 0.5 < m(3 pi) < 2.5 GeV/c(2), and in 11 bins of the reduced four-momentum transfer squared, 0.1 < t' < 1.0 (GeV/c)(2). This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant 3 pi production. In this paper, we present detailed studies on selected 3p partial waves with J(PC) = 0(-+) ,1(++) ,2(-+) ,2(++) ,and 4(++). In these waves, we observe the well-known groundstate mesons as well as a new narrow axial-vector meson a(1)(1420) decaying into f(0) (980)pi. In addition, we present the results of a novel method to extract the amplitude of the pi(-)pi(+) subsystem with I(G)J(PC) = 0(+)0(++) in various partial waves from the pi(-)pi(-)pi(+) data. Evidence is found for correlation of the f (0)(980) and f(0)(1500) appearing as intermediate pi(-)pi(+) isobars in the decay of the known pi(1800) and pi(2)(1880).
Published: 2017
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36. Sivers asymmetry extracted in SIDIS at the hard scales of the Drell-Yan process at COMPASS

Author: V. Andrieux, S. Grabmüller, Adam Szabelski, Alexandr Selyunin, W. Eyrich, K. Schmidt, Andrea Ferrero, Nour Makke, W. C. Chang, P. Kremser, M. Aghasyan, D.I. Ryabchikov, Jen-Chieh Peng, Norihiro Doshita, J. Pochodzalla, A. Nagaytsev, F. Balestra, A. Rychter, N. Pierre, W. Augustyniak, N. d'Hose, R. Longo, A. Thiel, V.N. Kolosov, P. Sznajder, K. Schönning, D. Steffen, J. Smolik, Miroslav Sulc, M. Tasevsky, E. Mitrofanov, P. Schiavon, O. Subrt, A. Lehmann, Q. Curiel, Andrew Ivanov, G. Nukazuka, D. von Harrach, C. Adolph, N.S. Rossiyskaya, F. Giordano, H. Matsuda, K. Klimaszewski, E. Seder, Celso Augusto Guimarães Santos, S. Gerassimov, Frank Klein, N. Horikawa, Y. Miyachi, A.A. Lednev, Yakov Petrovich Kulinich, Andres Cicuttin, I. Orlov, V.D. Samoylenko, P. Jörg, G. Reicherz, K. Königsmann, M. Slunecka, A. Magnon, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, S. Ramos, S. Dalla Torre, F. Tosello, S. Tessaro, V. Tskhay, S. Levorato, M. Wilfert, T. Matsuda, A. Zink, D. Hahne, D.V. Peshekhonov, Markus Ball, A. Sandacz, N. Mitrofanov, M. Finger, M. Ziembicki, K. Bicker, C. Franco, Yu. Ivanshin, A. Grasso, P. Bordalo, Takahiro Iwata, C. Regali, Yu.A. Khokhlov, L. Dhara, S.S. Dasgupta, M. Meyer, S. Platchkov, P. Zavada, G. Hamar, N. I. Zhuravlev, Federica Sozzi, F. H. Heinsius, Johannes Bernhard, Ch. Dreisbach, A. Guskov, M. Stolarski, W. Meyer, Maria Liz Crespo, C. Braun, B. Badelek, M. Grosse Perdekamp, A.V. Efremov, J. Vondra, M.G. Alexeev, M. V. Zavertyaev, Y.-S. Lian, I. Gnesi, F. Thibaud, J. Barth, F. Nerling, Mikhail Mikhasenko, B. Ketzer, Andrea Bressan, V. Jary, S. Uhl, J. Giarra, S. Takekawa, F. Pereira, Gerhard K. Mallot, Michal Dziewiecki, B. Grube, I. Konorov, F. Haas, C. Elia, G.V. Khaustov, R. Birsa, N. C. R. Makins, J. Lichtenstadt, M. Quaresma, J. Pretz, Alan D. Martin, H. Schmieden, Yu. Kisselev, Z.V. Kroumchtein, R. Salac, N. du Fresne von Hohenesche, T. Weisrock, J.M. Friedrich, E. Fuchey, Aram Kotzinian, C. Riedl, F. Kunne, D. Neyret, M. Ostrick, R.P. Kurjata, K. Zaremba, E.R. Bielert, Franco Bradamante, S. Huber, J.F.C.A. Veloso, S. Dasgupta, M. Virius, A. Maggiora, E. Zemlyanichkina, J. ter Wolbeek, A. Austregesilo, Jan Matousek, O.M. Kouznetsov, A. Srnka, V.A. Polyakov, M. Büchele, Arseniy Rybnikov, F. Krinner, J.H. Koivuniemi, V. Duic, W.-D. Nowak, J. Nový, G. Sbrizzai, A. Amoroso, T. Sawada, S.-U. Chung, M. Chiosso, M. Krämer, K. Kurek, M. Gorzellik, Nikolay Anfimov, François Herrmann, M. Faessler, R. Joosten, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, K. Kondo, Y. Bedfer, C. Chatterjee, Kamil Augsten, E. M. Kabuß, C. Quintans, I.A. Savin, S. Sarkar, S. V. Donskov, M. Pešek, A.S. Nunes, D. Panzieri, Janusz Marzec, T. Grussenmeyer, T. Szameitat, B. Marianski, Bakur Parsamyan, V.F. Konstantinov, S. Wallner, S. Ishimoto, H. Fischer, A.G. Olshevsky, Fabrice Gautheron, R. Akhunzyanov, G. D. Alexeev, W. Dünnweber, R. Heitz, V. Anosov, G.V. Meshcheryakov, Yu. V. Mikhailov, S. Sirtl, O.Yu. Denisov, F. Tessarotto, Laura Gonzalez Silva, M. Levillain, C.-Y. Hsieh, V. Frolov, Soumen Paul, M. Roskot, R. Beck, I. J. Choi, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, Andrea, Büchele, M., Chang, W. C., Chatterjee, Chandradoy, Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C. h., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lian, Y. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pešek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Rossiyskaya, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, Adam, Szameitat, T., Sznajder, P., Takekawa, Stefano, Tasevsky, M., Tessaro, Susanna, Tessarotto, F., Thibaud, F., Thiel, A., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Zink, A., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay
Subjects: Drellâ Yan, Drell-Yan process, Photon, Hadron, parton: distribution function, Drell-Yan, Parton, transverse momentum dependence, 01 natural sciences, COMPASS, SIDIS, High Energy Physics - Experiment, Sivers function, Subatomär fysik, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Compass, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], dimension: 2, Nuclear Experiment, Drell–Yan, Spin, Azimuthal asymmetries, Sivers, TMDs, media_common, Physics, Quantum chromodynamics, deep inelastic scattering: semi-inclusive reaction, polarized target: transverse, photon, Drell–Yan process, hep-ph, lcsh:QC1-999, Azimuthal asymmetrie, High Energy Physics - Phenomenology, kinematics, Siver, polarized beam: longitudinal, Nucleon, spin: asymmetry, Particle Physics - Experiment, Particle physics, Nuclear and High Energy Physics, angular distribution: asymmetry, media_common.quotation_subject, FOS: Physical sciences, Asymmetry, Nuclear physics, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], DrellâYan, 0103 physical sciences, muon nucleon: deep inelastic scattering, quantum chromodynamics, muon nucleon: scattering, 010306 general physics, Particle Physics - Phenomenology, nucleon: transverse momentum, 010308 nuclear & particles physics, 160 GeV/c, hep-ex, CERN SPS, muon+ p: deep inelastic scattering, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, lcsh:Physics, experimental results
Abstract: Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. Various two-dimensional kinematic dependences are presented for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics., 13 pages, 6 figures
Published: 2017
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37. High purity 100 GeV electron identification with synchrotron radiation

Author: V. V. Myalkovskiy, B. Radics, Adrian Fabich, B. Ketzer, B.I. Vasilishin, Danila Tlisov, A.G. Chumakov, Igor Konorov, V.D. Samoylenko, David R. Cooke, S. V. Donskov, A. Gardikiotis, P. Ulloa, Viktor Matveev, S. N. Gninenko, Mikhail Kirsanov, André Rubbia, M. Hösgen, Yu. V. Mikhailov, V.A. Polyakov, D.V. Peshekhonov, Anton Karneyeu, R.R. Dusaev, G. Vasquez Arenas, Paolo Crivelli, D. Banerjee, Filipp Dubinin, V. M. Lysan, V. O. Tikhomirov, S. Emmenegger, Sergey Kuleshov, Viktor Kramarenko, Valery E. Lyubovitskij, Vladimir Frolov, Alexander Dermenev, V.E. Burtsev, E. Depero, Vladimir Peshekhonov, and Alexander Toropin
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Synchrotron radiation, FOS: Physical sciences, Electron, 01 natural sciences, law.invention, High Energy Physics - Experiment, Nuclear physics, Synchrotron detector, Hadron rejection, High energy electron tagging, High Energy Physics - Experiment (hep-ex), Dipole magnet, law, 0103 physical sciences, Beam dump, Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, Physics, Large Hadron Collider, 010308 nuclear & particles physics, hep-ex, Instrumentation and Detectors (physics.ins-det), Charged particle, Beamline, Physics::Accelerator Physics, High Energy Physics::Experiment, Beam (structure), Particle Physics - Experiment
Abstract: In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique to reject heavy charged particle contamination in the 100 GeV electron beam of the H4 beam line at CERN SPS. The method is based on the detection with BGO scintillators of the synchrotron radiation emitted by the electrons passing through a bending dipole magnet. A 100 GeV $\pi^-$ beam is used to test the method in the NA64 experiment resulting in a suppression factor of $10^{-5}$ while the efficiency for electron detection is $\sim$95%. The spectra and the rejection factors are in very good agreement with the Monte Carlo simulation. The reported suppression factors are significantly better than previously achieved., Comment: 10 pages, 6 figures
Published: 2017

38. First measurement of the Sivers asymmetry for gluons using SIDIS data

Author: S. V. Donskov, O.Yu. Denisov, M. Pešek, C. Regali, K. Königsmann, Aram Kotzinian, A.S. Nunes, D.V. Peshekhonov, D. Panzieri, Janusz Marzec, T. Grussenmeyer, P.D. Eversheim, R. Beck, A. Kerbizi, M. Wilfert, J. ter Wolbeek, H. Suzuki, C.D.R. Azevedo, A. Maggiora, G.V. Meshcheryakov, Yu. V. Mikhailov, S. Sirtl, C. Adolph, Arseniy Rybnikov, S. Gerassimov, N. Horikawa, F. Giordano, A. Grasso, W.-D. Nowak, F. Tosello, S. Tessaro, F. Tessarotto, Laura Gonzalez Silva, Yu. Kisselev, D. Hahne, J. Nový, R. Salac, M. Ostrick, M. Stolarski, I. Gnesi, Andrew Ivanov, E.R. Bielert, A.G. Olshevsky, F. Krinner, A. Rychter, S.S. Dasgupta, R. Akhunzyanov, Yu.A. Khokhlov, T. Szameitat, R. Longo, G. Nukazuka, P. Kremser, G. D. Alexeev, D.I. Ryabchikov, W. Dünnweber, M. Levillain, C.-Y. Hsieh, S.-U. Chung, E. Seder, M. Krämer, V. Frolov, Soumen Paul, M. V. Zavertyaev, V. Anosov, Franco Bradamante, D. von Harrach, V.N. Kolosov, K. Schönning, F. Thibaud, J. Barth, Celso Augusto Guimarães Santos, M. Ziembicki, T. Sawada, I. J. Choi, E. M. Kabuß, A. Magnon, C. Quintans, M. Tasevsky, Gerhard K. Mallot, E. Mitrofanov, R. Heitz, Miroslav Sulc, I.A. Savin, P. Schiavon, F. H. Heinsius, O.P. Gavrichtchouk, M. Chiosso, Martin Bodlak, L. Sinha, François Herrmann, T. Weisrock, T. Matsuda, A. Zink, Takahiro Iwata, G.V. Khaustov, Fabrice Gautheron, H. Matsuda, V. Tskhay, Alexandr Selyunin, N.S. Rogacheva, K. Kurek, V. Andrieux, Adam Szabelski, M. Meyer, L. Dhara, C. Braun, B. Marianski, M. Grosse Perdekamp, M.G. Alexeev, A.V. Efremov, B. Badelek, S. Uhl, A. Vauth, F. Kunne, Bakur Parsamyan, W. Eyrich, Nour Makke, J. Giarra, W. C. Chang, S. Grabmüller, Michal Dziewiecki, B. Ketzer, M. Roskot, S. Takekawa, Anne-Laure Martin, F. Pereira, A. Antoshkin, S. Platchkov, P. Zavada, H. Schmieden, J.M. Friedrich, W. Meyer, Maria Liz Crespo, J. Pretz, K. Zaremba, M. Slunecka, V.A. Polyakov, S. Huber, V. Jary, V.F. Konstantinov, M. Gorzellik, S. Wallner, S. Ishimoto, Kamil Augsten, E. Zemlyanichkina, H. Fischer, M. Aghasyan, G. Sbrizzai, Johannes Bernhard, Ch. Dreisbach, P. Bordalo, A. Guskov, A. Amoroso, J. Pochodzalla, Yakov Petrovich Kulinich, Andrea Bressan, A. Nagaytsev, N. du Fresne von Hohenesche, F. Balestra, N. I. Zhuravlev, N. Pierre, M. Finger, F. Haas, N. C. R. Makins, K. Bicker, E. Fuchey, R. Birsa, J. Lichtenstadt, C. Riedl, Jan Matousek, M. Quaresma, D. Neyret, Nikolay Anfimov, R. Joosten, S. Dasgupta, J. Vondra, A. Austregesilo, Y.-S. Lian, J.F.C.A. Veloso, K. Kondo, Y. Bedfer, O.M. Kouznetsov, A. Srnka, C. Chatterjee, Z.V. Kroumchtein, V. Duic, W. Augustyniak, S. Ramos, K. Schmidt, P. Sznajder, Andrea Ferrero, Norihiro Doshita, N. d'Hose, D. Steffen, J. Smolik, O. Subrt, A. Lehmann, A. Thiel, Q. Curiel, K. Klimaszewski, Y. Miyachi, A.A. Lednev, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, S. Dalla Torre, Frank Klein, I. Konorov, A. Sandacz, C. Franco, Jen-Chieh Peng, Markus Ball, Yu. Ivanshin, F. Nerling, G. Hamar, M. Büchele, Mikhail Mikhasenko, M. Faessler, J.H. Koivuniemi, B. Grube, R.P. Kurjata, M. Virius, P. Jörg, S. Levorato, N. Mitrofanov, S. Sarkar, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), COMPASS, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., BadeÅ‚ek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Bã¼chele, M., Chang, W. -. C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y. u., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C. h., Duic, V., Quintans, C., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Ramos, S., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grabmã¼ller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jary, V., Joosten, R., Jã¶rg, P., Kabuãÿ, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Kã¶nigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krã¤mer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y. -. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marianski, B., Martin, A., Marzec, J., Matouå¡ek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Novã½, J., Nowak, W. -. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -. C., Pereira, F., Peå¡ek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Ziembicki, M., Zink, A., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schã¶nning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Thiel, A., Tosello, F., Tskhay, V., Uhl, S., Vauth, A., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., and Zhuravlev, N.
Subjects: hadron: angular distribution, muon+: polarized beam, Nuclear Theory, Parton, muon+ deuteron: deep inelastic scattering, hadron: transverse momentum, transverse momentum dependence, 01 natural sciences, COMPASS, High Energy Physics - Experiment, Subatomär fysik, Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), photon gluon: fusion, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton, Nuclear Experiment, media_common, Quantum chromodynamics, Physics, gluon: distribution function, deep inelastic scattering: semi-inclusive reaction, higher-order: 0, polarized target: transverse, hep-ph, Deep inelastic scattering, Gluon, PDF, Sivers, TMD, Nuclear and High Energy Physics, lcsh:QC1-999, High Energy Physics - Phenomenology, Siver, effect: Collins, Nucleon, Compton scattering, numerical calculations: Monte Carlo, spin: asymmetry, Particle Physics - Experiment, Quark, Particle physics, data analysis method, deuteron: polarized target, hadron: asymmetry, angular distribution: asymmetry, neural network, media_common.quotation_subject, polarization: longitudinal, FOS: Physical sciences, Asymmetry, Nuclear physics, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, quantum chromodynamics, 010306 general physics, Particle Physics - Phenomenology, 010308 nuclear & particles physics, hep-ex, 160 GeV/c, High Energy Physics::Phenomenology, nucleon: spin: transverse, CERN SPS, muon+ p: deep inelastic scattering, correlation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, absorption, lcsh:Physics, Lepton, experimental results
Abstract: The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. In this letter the evaluation of the Sivers asymmetry for gluons in the same process is presented. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon-gluon fusion, QCD Compton scattering and leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/$c$ muon beam scattered off transversely polarised deuterons and protons. With a significance of more than two standard deviations a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero., Comment: 18 pages, 8 figures
Published: 2017
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39. Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

Author: A. Maggiora, J. Lichtenstadt, S.-U. Chung, N.S. Rossiyskaya, F. Giordano, K. Schmidt, Norihiro Doshita, M. Gorzellik, M. Wilfert, V.I. Nikolaenko, M. Grosse Perdekamp, F. Thibaud, N. d'Hose, V. Anosov, H. Schmieden, J.M. Friedrich, Y.-S. Lian, François Herrmann, C. Adolph, Laura Silva, M. Meyer, A. Grasso, J. Bisplinghoff, M. V. Zavertyaev, M. Roskot, M. Krämer, J. Barth, J. Smolik, W. Augustyniak, S. Ramos, R. Akhunzyanov, S. Huber, E. M. Kabuß, C. Regali, C. Marchand, Y. u. Ivanshin, Gerhard K. Mallot, S. Takekawa, P.D. Eversheim, I. Konorov, H. Suzuki, C.D.R. Azevedo, M. Stolarski, E. Zemlyanichkina, Yakov Petrovich Kulinich, S. Grabmüller, D.V. Peshekhonov, G. D. Alexeev, N. C. R. Makins, P. Zavada, W. Meyer, Maria Liz Crespo, V. Jary, J. Pretz, T. Weisrock, A.V. Efremov, S. Platchkov, M. Tasevsky, F. Pereira, E. Mitrofanov, C. Quintans, Z.V. Kroumchtein, N. du Fresne von Hohenesche, G.V. Meshcheryakov, P. Sznajder, Kamil Augsten, Yu. V. Mikhailov, S. Sirtl, I.A. Savin, W. Dünnweber, V. Andrieux, L. Dhara, M. Faessler, C. Braun, K. Bicker, Adam Szabelski, Mikhail Mikhasenko, D. Steffen, M. Aghasyan, E. Fuchey, Aram Kotzinian, R. Windmolders, Nikolay Anfimov, B. Marianski, B. Badelek, K. Zaremba, F. Tessarotto, Miroslav Sulc, F. Hinterberger, V.A. Polyakov, F. Nerling, R. Jahn, J. Pochodzalla, Andrew Ivanov, A. Magnon, B. Ketzer, G. Sbrizzai, A. Nagaytsev, F. Balestra, N. Pierre, Bakur Parsamyan, O.P. Gavrichtchouk, M. Finger, P. Bordalo, Jan Matousek, M. Ziembicki, Martin Bodlak, A. Rychter, Johannes Bernhard, A. Guskov, P. Montuenga, P. Kremser, R. Longo, F. Haas, L. Sinha, T. Matsuda, A. Zink, V.N. Kolosov, K. Schönning, A. Amoroso, A. Lehmann, R. Joosten, D.I. Ryabchikov, Y. Miyachi, A.A. Lednev, F. H. Heinsius, D. von Harrach, K. Königsmann, M. Slunecka, C. Riedl, Arseniy Rybnikov, B. Grube, T. Michigami, R. Heitz, J. ter Wolbeek, I. Gnesi, Yu. Kisselev, R. Birsa, G.V. Khaustov, Andrea Bressan, L. Capozza, C. Franco, K. Kondo, Franco Bradamante, W.-D. Nowak, N. I. Zhuravlev, Federica Sozzi, A. Sandacz, S. Gerassimov, N. Horikawa, K. Klimaszewski, Frank Klein, V.F. Konstantinov, Y. Bedfer, Jen-Chieh Peng, S. Schopferer, F. Tosello, E. Seder, S. Tessaro, D. Hahne, Fabrice Gautheron, M.G. Alexeev, Chandradoy Chatterjee, S. Ishimoto, H. Fischer, A.G. Olshevsky, M. Levillain, C.-Y. Hsieh, Celso Augusto Guimarães Santos, V. Frolov, S. Uhl, Yu.A. Khokhlov, T. Szameitat, Andres Cicuttin, Q. Curiel, P. Schiavon, Soumen Paul, D. Neyret, T. Sawada, I. Orlov, V.D. Samoylenko, Alexandr Selyunin, G. Reicherz, Michal Dziewiecki, P. Jörg, R. Kuhn, V. Tskhay, W. Eyrich, I. J. Choi, Nour Makke, O.Yu. Shevchenko, S. Levorato, H. Matsuda, Andrea Ferrero, W. C. Chang, Shuddha Shankar Dasgupta, S. Dalla Torre, M. Chiosso, M. Büchele, Alan D. Martin, S. Sarkar, J.H. Koivuniemi, S. Dasgupta, N. Mitrofanov, R.P. Kurjata, A. Austregesilo, F. Krinner, M. Quaresma, O.Yu. Denisov, M. Virius, F. Kunne, G. Nukazuka, K. Kurek, S. V. Donskov, M. Pešek, R. Hashimoto, A.S. Nunes, Takahiro Iwata, R. Beck, D. Panzieri, Janusz Marzec, T. Grussenmeyer, J. Vondra, J.F.C.A. Veloso, O.M. Kouznetsov, A. Srnka, R. Salac, M. Ostrick, E.R. Bielert, V. Duic, M. Boer, J. Nový, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, Renato, Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Capozza, L., Chang, W. C., Chatterjee, Chandradoy, Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Yu, Dhara, L., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuhn, R., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lian, Y. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marchand, C., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Nový, J., Nowak, W. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pešek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Rossiyskaya, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Seder, E., Selyunin, A., Shevchenko, O. Yu, Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, Federica, Srnka, A., Steffen, D., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, Adam, Szameitat, T., Sznajder, P., Takekawa, Stefano, Tasevsky, M., Tessaro, Susanna, Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Weisrock, T., Wilfert, M., Windmolders, R., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., and Zink, A.
Subjects: Quark, Nuclear and High Energy Physics, Photon, Isoscalar, Hadron, Nuclear Theory, HERMES, target: isoscalar, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, COMPASS, scaling: Bjorken, Nuclear physics, Pion, Astronomi, astrofysik och kosmologi, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Astronomy, Astrophysics and Cosmology, Pion multiplicities, Nuclear Physics - Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], quantum chromodynamics: perturbation theory, 010306 general physics, Nuclear Experiment, RICH, Deep inelastic scattering, Fragmentation functions, Physics, quark: fragmentation function, Muon, pi: multiplicity, hep-ex, 010308 nuclear & particles physics, Scattering, muon: beam, higher-order: 0, Fragmentation function, photon, hadron: energy, lcsh:QC1-999, kinematics, Pion multiplicitie, High Energy Physics::Experiment, Particle Physics - Experiment, lcsh:Physics
Abstract: Multiplicities of charged pions and charged hadrons produced in deep-inelastic scattering were measured in three-dimensional bins of the Bjorken scaling variable x , the relative virtual-photon energy y and the relative hadron energy z . Data were obtained by the COMPASS Collaboration using a 160GeV muon beam and an isoscalar target ( 6 LiD). They cover the kinematic domain in the photon virtuality Q2>1(GeV/c)2 , 0.004 1(GeV/c$)^2$, $0.004 < x < 0.4$, $0.2 < z < 0.85$ and $0.1 < y < 0.7$. In addition, a leading-order pQCD analysis was performed using the pion multiplicity results to extract quark fragmentation functions.
Published: 2017
Full Text: View/download PDF

40. Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

Author: S.S. Dasgupta, M. V. Zavertyaev, Q. Curiel, H. Schmieden, J.M. Friedrich, D. Neyret, A. Maggiora, N.S. Rossiyskaya, F. Giordano, M. Wilfert, E. M. Kabuß, L. Capozza, S. Huber, K. Königsmann, I.A. Savin, K. Kondo, Y. Bedfer, C. Quintans, Frank Klein, D.V. Peshekhonov, F. Haas, M. Gorzellik, W. Augustyniak, S. Ramos, E. Zemlyanichkina, A. Grasso, J. Nový, K. Zaremba, Y.-S. Lian, V.A. Polyakov, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, S.-U. Chung, P. Jörg, C. Chatterjee, G. Sbrizzai, Anne-Laure Martin, F. Thibaud, Markus Ball, Andrea Ferrero, A. Amoroso, S. Dasgupta, A. Austregesilo, Yu. Ivanshin, P. Sznajder, S. Levorato, Andrew Ivanov, C. Riedl, I. Gnesi, François Herrmann, J. Barth, D. Steffen, G.V. Meshcheryakov, S. Sarkar, N. Mitrofanov, S. Platchkov, M. Faessler, Yu. V. Mikhailov, S. Sirtl, M. Ziembicki, Z.V. Kroumchtein, N. du Fresne von Hohenesche, Nikolay Anfimov, A. Lehmann, A. Thiel, M. Tasevsky, F. H. Heinsius, R. Joosten, S. Grabmüller, E. Mitrofanov, Franco Bradamante, F. Nerling, R.P. Kurjata, Gerhard K. Mallot, V.F. Konstantinov, S. Wallner, M. Levillain, C. Regali, G.V. Khaustov, S. V. Donskov, M. Pešek, L. Dhara, T. Sawada, C. Braun, C.-Y. Hsieh, V. Frolov, Soumen Paul, M. Virius, S. Ishimoto, H. Fischer, B. Badelek, M. Stolarski, C. Adolph, N. C. R. Makins, Y. Miyachi, A.A. Lednev, D. von Harrach, M. Aghasyan, A.S. Nunes, K. Klimaszewski, T. Weisrock, W. Dünnweber, B. Ketzer, Alexandr Selyunin, A. Rychter, J. Pochodzalla, D. Panzieri, Janusz Marzec, I. J. Choi, A. Sandacz, V. Andrieux, Andres Cicuttin, I. Orlov, P. Schiavon, E. Fuchey, Miroslav Sulc, M. Chiosso, R. Longo, W. Eyrich, S. Gerassimov, N. Horikawa, V.N. Kolosov, G. Hamar, P. Bordalo, B. Marianski, Adam Szabelski, V.D. Samoylenko, G. Reicherz, Nour Makke, F. Tosello, T. Grussenmeyer, K. Schmidt, O.P. Gavrichtchouk, Jan Matousek, K. Schönning, W. C. Chang, Norihiro Doshita, Bakur Parsamyan, K. Kurek, Martin Bodlak, L. Sinha, S. Dalla Torre, M. Grosse Perdekamp, T. Matsuda, S. Tessaro, N. d'Hose, A. Zink, D. Hahne, Mikhail Mikhasenko, H. Matsuda, S. Takekawa, J. Vondra, A.V. Efremov, J. Smolik, F. Krinner, M. Quaresma, M. Slunecka, F. Pereira, O. Subrt, Yu.A. Khokhlov, A. Nagaytsev, F. Balestra, N. Pierre, J.F.C.A. Veloso, C. Franco, P. Zavada, Arseniy Rybnikov, O.M. Kouznetsov, A. Srnka, N. I. Zhuravlev, Federica Sozzi, W. Meyer, Maria Liz Crespo, W.-D. Nowak, M.G. Alexeev, S. Uhl, Aram Kotzinian, V. Duic, Michal Dziewiecki, B. Grube, R. Windmolders, M. Meyer, V. Jary, T. Szameitat, J. Pretz, V. Tskhay, Yu. Kisselev, R. Salac, J. ter Wolbeek, E. Seder, Fabrice Gautheron, Celso Augusto Guimarães Santos, M. Ostrick, E.R. Bielert, O.Yu. Denisov, F. Kunne, R. Beck, R. Akhunzyanov, G. D. Alexeev, R. Heitz, M. Krämer, Kamil Augsten, M. Finger, M. Roskot, V. Anosov, R. Birsa, J. Lichtenstadt, Laura Silva, Yakov Petrovich Kulinich, Jen-Chieh Peng, K. Bicker, P. Kremser, D.I. Ryabchikov, G. Nukazuka, A. Magnon, I. Konorov, Takahiro Iwata, A.G. Olshevsky, M. Büchele, Johannes Bernhard, Ch. Dreisbach, A. Guskov, J.H. Koivuniemi, Andrea Bressan, F. Tessarotto, Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, Renato, Bodlak, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Capozza, L., Chang, W. C., Chatterjee, Chandradoy, Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, SHUDDHA SHANKAR, Denisov, O. Yu, Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C. h., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lian, Y. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pešek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Rossiyskaya, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, Federica, Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, Adam, Szameitat, T., Sznajder, P., Takekawa, Stefano, Tasevsky, M., Tessaro, Susanna, Tessarotto, F., Thibaud, F., Thiel, A., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., Windmolders, R., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Zink, A., Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CERN [Genève], and Universidade de Aveiro
Subjects: Quark, Strange quark, Particle physics, Nuclear and High Energy Physics, Isoscalar, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Kaon multiplicitie, High Energy Physics - Experiment, Subatomär fysik, Nuclear physics, High Energy Physics - Experiment (hep-ex), Subatomic Physics, 0103 physical sciences, Nuclear Physics - Experiment, ddc:530, Invariant mass, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Physics, Muon, hep-ex, 010308 nuclear & particles physics, Scattering, Quark fragmentation function, Deep inelastic scattering, lcsh:QC1-999, Quark fragmentation functions, Kaon multiplicities, High Energy Physics::Experiment, Particle Physics - Experiment, lcsh:Physics
Abstract: Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6 LiD target. They cover the kinematic domain 1 (GeV/c)2 < Q2 < 60 (GeV/c)^2 in the photon virtuality, 0.004 < x < 0.4, 0.1 < y < 0.7, 0.20 < z < 0.85, and W > 5 GeV/c^2 in the invariant mass of the hadronic system. The results from the sum of the z-integrated K+ and K- multiplicities at high x point to a value of the non-strange quark fragmentation function larger than obtained by the earlier DSS fit., 10 pages, 9 figures
Published: 2017
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41. Challenges in QCD matter physics --The scientific programme of the Compressed Baryonic Matter experiment at FAIR

Author: V. Jakovlev, R. Talukdar, Alberica Toia, V.M. Golovatyuk, P. Ivanov, Abhijit Bhattacharyya, M. Kohn, Yu. Onishchuk, M. Tanha, Suman Sau, E. Friske, L. Kumar, A. Roy, Valerica Baban, Yaping Wang, V. Blinov, D. Svirida, Pradip Kumar Sahu, D. Dementiev, A. Gomez Ramirez, M. Petris, Ming Shao, D. Blau, Yu. P. Tsyupa, A. Rost, D. P. Mahapatra, Y. F. Ryabov, D. Wielanek, Anju Bhasin, C. Lara, Saikat Biswas, Shusu Shi, E. P. Akishina, F. Seck, V. Jain, Hongfang Chen, O. Malyatina, B. Komkov, I. Carevic, V. Baublis, Raghunath Sahoo, D. Normanov, Tetyana Galatyuk, S. Amar-Youcef, Cristian Andrei, Yu. I. Bocharov, A. Vorobiev, M. Strikhanov, Y. Leifels, O. Petukhov, A. Petrovici, Dezso Varga, Oana Ristea, W. Verhoeven, J. Sánchez Rosado, Victor Golovtsov, S. Belogurov, E. Kryshen, M. Dey, Johannes Lehrbach, Y. P. Viyogi, A. V. Kazantsev, A. Himmi, M. Anđelić, Oleg Bezshyyko, Cheng Li, A. Raportirenko, Xu Cai, C. Kreidl, Daniela Bartos, T. Balog, Volker Lindenstruth, A. Chaus, M. Mohisin Khan, Mate Csanad, J. Pluta, A. Senger, Matthias Balzer, Christoph Blume, H. Appelshäuser, Di Jiang, B. Kämpfer, A. Lymanets, I. Berceanu, S. Gorbunov, S. Sarangi, V. Pospíšil, N. Heine, A. Veshikov, Yuanjing Li, V. Kushpil, Ch. Klein-Bösing, I. Selyuzhenkov, S. Razin, Guofeng Song, D. Belyakov, G. Berezin, V. Kyva, Andrei Ionut Herghelegiu, Heiko Engel, K. Schmidt, V. Klochkov, Alla Maevskaya, P.-A. Loizeau, L. Golinka-Bezshyyko, V.A. Karnaukhov, J. Bendarouach, C. Xiang, A.D. Sheremetiev, V. F. Chepurnov, Hr Schmidt, Zbigniew Sosin, M. Singla, I. Momot, O. Andreeva, I. Alexandrov, R. N. Singaraju, S. Avdeev, Evgeny Alexandrov, R. Płaneta, Gennady Ososkov, D. Hutter, A. Reinefeld, C.J. Schmidt, Andrei Dorokhov, Vikram Patel, K.-H. Becker, N. Kurepin, E. Lebedeva, C. P. Singh, Y. K. Sun, K. Jaaskelainen, Andras Szabo, J. Rożynek, Sanjeev Singh Sambyal, V. S. Negi, Krzysztof Piasecki, W. F. J. Müller, M. Baznat, N. Miftakhov, Feng Liu, N. Ahmad, L. Skoda, G. D. Kekelidze, Vladimir Ivanov, Krzysztof Kasinski, Xi-Wei Wang, D. Miskowiec, Serguei Volkov, Sudhir Raniwala, I. Tsakov, A. Nedosekin, Peter Senger, T. Barczyk, S. Dubnichka, C. Ristea, N.G. Tuturas, E. V. Atkin, D. Karmanov, W. Zabolotny, Tatiana Karavicheva, Subhasis Samanta, Yu.V. Zanevsky, S. Bähr, O. Batenkov, M. Petrovici, B. Milanovic, Muhammad Farooq, R. Karabowicz, I. Vassiliev, P. Staszel, Sheng Dong, Udo Wolfgang Kebschull, P. Koczon, Goutam Gangopadhyay, P. Zumbruch, Vladimir Plujko, Y. Berdnikov, Shue He, Volodymyr Vovchenko, V. Mialkovski, W. Zipper, T. Bus, O. Tarassenkova, S. K. Sahu, V. Militsija, Yu. Zaitsev, C. Müntz, S. K. Ghosh, Sushanta Tripathy, E. Rostchin, V. Shumikhin, I. Fröhlich, I. Panasenko, A. Laso Garcia, L. Dutka, Yu.S. Anisimov, B. Linnik, T. Tischler, A. Ivashkin, R. Kotte, Calin Besliu, T. Akishina, Rashmi Raniwala, Sheng Zheng, K. Koch, J. Kunkel, A. Shabunov, E. Lobanova, Wojciech Kucewicz, T. Breitner, M. Al-Turany, R. P. Adak, Claudiu Cornel Schiaua, S. Masciocchi, Zhongbao Yin, Xinjie Huang, Jens Wiechula, Nu Xu, I. Kisel, Christian Sturm, T. Mahmoud, V. Kalinin, A. Abuhoza, Mohd Danish Azmi, P. Zrelov, Jing Zhou, M. Dželalija, C. Deveaux, M. Goffe, Ke-Jun Wu, S. Strohauer, S. Bashir, D. Argintaru, B. Heß, A. Turowiecki, M. B. Golubeva, F. Ahmad, S. Gläßel, V. Plotnikov, Manuel Penschuck, Supriya Das, Grzegorz Kasprowicz, Vladislav Manko, O. Vasylyev, D. Kresan, L. Kudin, Yu. V. Gusakov, Dongdong Hu, Vladimir Nikulin, M. Ivanov, D. Gottschalk, Karl-Heinz Kampert, A. Kolosova, G. Caragheorgheopol, K. Dey, K. Mikhailov, Anand Kumar Dubey, J. Scholten, S. P. D. Figuli, T. Blank, Ajit Kumar, Vladimir Peshekhonov, Igor Pshenichnov, E. Badura, Michael Deveaux, I. Rostovtseva, M. Kiš, Jürgen Becker, Evgeny Karpechev, B. W. Kolb, Valery Pugatch, Xiaofeng Luo, I. Som, E. Ovcharenko, F.F. Guber, H. Büsching, H. Cherif, N. R. Panda, Zubayer Ahammed, R. Najman, Fouad Rami, M. Gumiński, J. Pieper, Jerzy Gajda, G. Kozlov, H. Jahan, A. Drozd, V. Butuzov, Joachim Stroth, I. K. Yoo, Thomas Janson, M. Petri, R. Holzmann, D. Finogeev, S. Golovnya, Ping Cao, E. Malankin, Buddhadeb Bhattacharjee, L. Meder, Junfeng Yang, Lei Zhao, C. Simon, S. Kuznetsov, I. Valin, M. Zyzak, H. Hartmann, T. Satława, Yi Wang, Anton Andronic, Daicui Zhou, Zebo Tang, M. Prokudin, V. Saveliev, Qiyan Li, I. M. Deppner, Mahitosh Mandal, F. Uhlig, J. A. Lucio Martínez, J. Book, L. Mik, S. Schatral, S. K. Pal, A. Petrovskiy, J. Pietraszko, B. Debnath, E. Usenko, O. Svoboda, Gy. Wolf, V.V. Elsha, J. Lehnert, Pengfei Lyu, S. Seddiki, Peter Fischer, Huanhuan Fan, D. Doering, J. Frühauf, C. Wendisch, Yu Zhang, V. Kozlov, P. Tlustý, Piotr Otfinowski, N. Baranova, Sergey Kiselev, J. Rautenberg, Dmitry Mal'kevich, I. Kadenko, I. Lobanov, Mikhail Zhalov, A. Rodriguez Rodriguez, D. Emschermann, Vikas Singhal, Pavel Akishin, M. Bach, P. Kravtsov, X. Zhu, C. Nandi, I. Korolko, Rongxing Yang, E. Nandy, D. Ivanischev, Anil Prakash, A. Semennikov, I. E. Yushmanov, S. Parzhitskiy, M. Vznuzdaev, A. Khvorostukhin, A. Kiryakov, Soma Mukherjee, LuYao Chen, M. Pugach, Piotr Kmon, J. Gebelein, V. Kleipa, C. Bergmann, Kai Schweda, S. Rabtsun, Victor Ivanov, Tivadar Kiss, M. Dreschmann, I. G. Alekseev, A. K. Kurilkin, A. Volochniuk, E. Krebs, A. Lebedev, V. Kramarenko, N. Topil'skaya, S. Das, S. Lebedev, S. Querchfeld, Madan M. Aggarwal, N.I. Zamiatin, Amrendra K. Singh, Swagata Mandal, A. Khanzadeev, C. Simons, Gilles Claus, U. Frankenfeld, V.V. Ivanov, A. Chernogorov, Pascal Dillenseger, V. Dobyrn, Z. Dubnichkova, S. Löchner, Bhartendu K. Singh, S. Ahmad, Rishat Sultanov, J. Kallunkathariyil, A. Wieloch, T. Matulewicz, R. Berendes, A. Shabanov, Saniya Khan, V. Friese, Anik Gupta, L. Kochenda, M. Kirejczyk, Pavel Kisel, Amlan Chakrabarti, Ashwini Kumar, Michal Koziel, A. Berdnikov, A. Sadovsky, T. O. Ablyazimov, S. Mahajan, M. Merkin, Robert Szczygiel, C. Pauly, Krzysztof Poźniak, F. Roether, Alexey Kurepin, Alexander Voronin, A. Bubak, Nikolai Shumeiko, Nicolas Winckler, A. V. Kryanev, Andrey Reshetin, A. Simakov, Sukalyan Chattopadhyay, E. M. Ilgenfritz, B. Sikora, Jihye Song, J. Hehner, Zhi Deng, M. Irfan, J. Saini, S. A. Lone, L. Naumann, D. Eschweiler, A. M. Marin Garcia, P. Kähler, O. Derenovskaya, A.P. Ierusalimov, Alexandru Jipa, K. Agarwal, T. Tolyhi, H. Malygina, Xingming Fan, Amalia Pop, Dmitry Golubkov, E. M. Verbitskaya, L. Radulescu, Ryszard S. Romaniuk, D. Pfeifer, Yifei Zhang, Rajarshi Ray, V. Zryuev, M. Teklishyn, M. Träger, S. Morozov, H. Flemming, A. Oancea, A. Wilms, P. Ghosh, A. Grzeszczuk, V. Mikhaylov, Patrick Simon Reichelt, Ankhi Roy, Sanguk Won, Vladimir Samsonov, T. Esanu, V. Akishina, D.V. Peshekhonov, A.I. Zinchenko, M. Żoładź, Xin Li, I. Sibiryak, J. Wüstenfeld, Aleksey Voronin, M. Korolev, Guangming Huang, A. Kugler, E. Kaptur, J. Michel, J. Tarasiuk, Manjit Kaur, A. Bychkov, F. Lemke, Bekhzod S Yuldashev, T. K. Bhattacharyya, S. Gorokhov, F. Schintke, P. Klaus, Adrian Byszuk, Ionel Lazanu, Dong Wang, Michael Dürr, M. Krieger, H. Deppe, Sibaji Raha, O. Sander, S. Kowalski, K. Wiśniewski, Alexander Malakhov, I. Filozova, Shengqin Feng, M. Calin, S. Reinecke, V. Kucher, M. Weber, A. Kovalchuk, V. Petráček, M. Adamczyk, K.K. Gudima, Johannes Peter Wessels, P. Sitzmann, J. Markert, V. K. Eremin, Alexandru Bercuci, Marc Winter, Mateusz Baszczyk, M.I. Ciobanu, E. Bao, M. Kuc, U. Brüning, O. V. Fateev, Piotr Maj, J. de Cuveland, M. G. Târzilă, Pavel Larionov, R. Averbeck, Jianping Cheng, Jacek Rauza, C. E. Muñoz Castillo, N. D'Ascenzo, O. Bertini, Wendi Deng, G. Kretschmar, I. Skwira-Chalot, W. Niebur, K. Oh, V. P. Ladygin, T. Morhardt, C. Höhne, M. G. Wiebusch, Partha Pratim Bhaduri, Dong Han, Oleg Karavichev, N. Herrmann, R. Visinka, F. Constantin, C. García Chávez, J. Brzychczyk, Sidharth Kumar Prasad, D. Soyk, V. V. Kirakosyan, W. Koenig, D. Bertini, Z. Majka, F. Khasanov, J. Eschke, P. Gryboś, E. Lavrik, V. Cătănescu, K. Siwek-Wilczyńska, P. K. Kurilkin, J.M. Heuser, Adeel Akram, Yu. Murin, Alexander Akindinov, A. K. Bhati, I. Kres, J. Förtsch, Rafal Kleczek, Jiajun Zheng, S. Manz, T. K. Nayak, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), CBM, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: J/psi(3100), Phase transition, matter: interaction, Hadron, Nuclear Theory, hypernucleus, 7. Clean energy, 01 natural sciences, Critical point (thermodynamics), transport theory, hadron: gas, Nuclear Experiment, neutron star, QCD matter, Brookhaven RHIC Coll, quark gluon: plasma, Physics, Large Hadron Collider, fireball, elliptic flow, strong interaction, Observable, heavy ion, CERN LHC Coll, QCD matter, Quark-Gluon-Plasma (QGP), QCD phase diagram, strong interaction, hadronic matter, partonic matte, heavy-ion, 2-4.9 GeV/nucleon, Nuclear and High Energy Physics, Particle physics, CBM, charmonium, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Strong interaction, review, nonperturbative, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], symmetry: chiral, quantum chromodynamics: critical phenomena, strangeness, 0103 physical sciences, density: high, Darmstadt GSI FAIR, structure, 010306 general physics, equation of state, quantum chromodynamics: matter, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, nucleus, temperature: high, baryon, Neutron star, Automatic Keywords, HADES, charm
Abstract: International audience; Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 ( $\sqrt{s_{NN}}=$ 2.7--4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials ( $\mu_B > 500$ MeV), effects of chiral symmetry, and the equation of state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2024, in the context of the worldwide efforts to explore high-density QCD matter.
Published: 2017
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42. Leading order determination of the gluon polarisation from DIS events with high-pThadron pairs

Author: S. Koblitz, S. Ramos, F. Haas, R. Geyer, R. Panknin, E. Rondio, Fabrice Gautheron, M. A. Faessler, V.Yu. Alexakhin, J. Polak, V.N. Kolosov, Christian Schill, N.S. Rossiyskaya, F. Kunne, R. Jahn, F. Tessarotto, C. Heß, C. Adolph, A. Korzenev, A. Grasso, J. M. Le Goff, D. Chaberny, V. Duic, E. M. Kabuß, O.P. Gavrichtchouk, A.A. Lednev, A. Nagaytsev, F. Balestra, A. Srnka, L. Sinha, T. Matsuda, G. D. Alexeev, F. Nerling, A.V. Efremov, W. Dünnweber, Yu.V. Mikhailov, R. Gushterski, Yu. Alexandrov, Yu. Kisselev, George I. Smirnov, S. Hedicke, Z.V. Kroumchtein, I.A. Savin, S. Grabmüller, I. Konorov, W.-D. Nowak, O.Yu. Denisov, A. Zvyagin, M. Ostrick, Bakur Parsamyan, C. Quintans, K. Zaremba, Alessandro Bressan, D. von Harrach, S. Gerassimov, G. Piragino, T. Guthörl, N. Horikawa, Sergey Donskov, L. Dhara, S. Ishimoto, Frank Klein, C. Braun, V.A. Polyakov, G. Sbrizzai, Ch. Höppner, A. Amoroso, S. Uhl, S.U. Chung, L. Schmitt, Oleg V. Ivanov, Maxence Vandenbroucke, B. Badelek, R. Birsa, Matthias Schott, N. du Fresne von Hohenesche, T. Schlüter, M. Giorgi, Michal Dziewiecki, E. Perevalova, S. Tessaro, E. Rocco, A. Richter, K. Klimaszewski, S. Das, R. Gazda, M. Chiosso, A.G. Olshevsky, Laura Silva, B. Ketzer, I. Uman, A. Morreale, Andres Cicuttin, A. Filin, A. Magnon, G. Reicherz, R. Joosten, V.D. Samoylenko, K. Kurek, A. Padee, L. G. Tkatchev, Yu.A. Khokhlov, D. Neyret, S. Paul, J. Pochodzalla, M. Stolarski, J.M. Friedrich, K. Bicker, R. Bertini, Andrea Ferrero, S. Dalla Torre, J. Bisplinghoff, S. Huber, G.V. Khaustov, S.S. Dasgupta, A. Mutter, Jean-Francois Rajotte, D.I. Ryabchikov, A.S. Nunes, Vladimir Nikolaenko, Miroslav Sulc, Aram Kotzinian, F. Hinterberger, P. Bordalo, D. Kang, R. Windmolders, H. Wollny, D. Panzieri, L. Lauser, O. Kouznetsov, E. Zemlyanichkina, W. Meyer, Maria Liz Crespo, J. Lichtenstadt, J. Marzec, Yu. Ivanshin, M.G. Alekseev, P. Jasinski, Franco Bradamante, M. V. Zavertyaev, Anne-Laure Martin, K. Schönning, Alexey Antonov, A. Bravar, P. Sznajder, J. ter Wolbeek, Johannes Bernhard, J. Nassalski, S. Sosio, S. Takekawa, M. Bettinelli, Michael Kramer, A. Guskov, K. Kondo, J. Barth, Y. Bedfer, E. Burtin, V.F. Konstantinov, A. Lehmann, C. Franco, J.H. Koivuniemi, C. Marchand, Gerhard K. Mallot, S. Goertz, V. Rapatsky, Sarben Sarkar, H. Fischer, P. Schiavon, K. Königsmann, A. Maggiora, B. Grube, N. dʼHose, N.V. Vlassov, Günter Baum, O.Yu. Shevchenko, S. Levorato, R. Garfagnini, M. Finger, Murray Moinester, François Herrmann, S. Platchkov, Lei Wang, M. Slunecka, M. Virius, W. Wiślicki, G.B. Pontecorvo, B. Gobbo, N. I. Zhuravlev, Federica Sozzi, S. Schopferer, T. Nagel, J. Pretz, R. Sulej, S. Procureur, T. Michigami, A. Mann, W. Eyrich, Nour Makke, J. Bieling, A. Sandacz, M. Quaresma, M.G. Sapozhnikov, K. Schmidt, D.V. Peshekhonov, Norihiro Doshita, A. N. Sissakian, G. Pesaro, I. Gnesi, P.D. Eversheim, S. Neubert, T. Iwata, M. Ziembicki, F. H. Heinsius, A. Austregesilo, and C. Elia
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, 010308 nuclear & particles physics, Hadron, Deep inelastic scattering, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q(2) > 1 (GeV/c)(2) including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised (LiD)-Li-6 target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction x(g) covering the range 0.04 < x(g) < 0.27. The values obtained at leading order in QCD do not show any significant dependence on x(g). Their average is Delta g/g = 0.125 +/- 0.060 (stat.) +/- 0.063 (syst.) at average x(g) = 0.09 and a scale of mu(2) = 3 (GeV/c)(2).
Published: 2013
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43. Exclusive muoproduction on transversely polarised protons and deuterons

Author: O.P. Gavrichtchouk, M. Ziembicki, L. Sinha, S. Sarkar, L. Steiger, A. Padee, T. Matsuda, A. Srnka, S. Dasgupta, A.V. Efremov, G. D. Alexeev, W. Dünnweber, A. Austregesilo, C. Elia, R. Bertini, Andrea Ferrero, G. Piragino, Jean-Francois Rajotte, D.I. Ryabchikov, M. Wilfert, I. Konorov, E. Rondio, K. Zaremba, M. Krämer, S.-U. Chung, Z.V. Kroumchtein, L. Lauser, A.S. Nunes, D. Panzieri, S. Uhl, M. Giorgi, S. Goertz, C. Quintans, F.H. Heinsius, V.A. Polyakov, G. Sbrizzai, A. Zvyagin, T. Liška, Michal Dziewiecki, S. Neubert, Laura Silva, A. Magnon, S. Grabmüller, A. Amoroso, François Herrmann, L. Dhara, C. Braun, B. Grube, B. Badelek, S. Koblitz, N. du Fresne von Hohenesche, T. Schlüter, E. Rocco, V. Duic, M. Chiosso, O. Kouznetsov, Frank Klein, P.D. Eversheim, Aram Kotzinian, R. Windmolders, G.I. Smirnov, B. Ketzer, A. Filin, Anne-Laure Martin, Franco Bradamante, K. Kurek, G.V. Khaustov, Yu. Kisselev, Fabrice Gautheron, H. Suzuki, M. Slunecka, W. Wiślicki, Murray Moinester, L. Schmitt, J. Pochodzalla, M. Büchele, J. Polak, M. A. Faessler, B. Gobbo, K. Schönning, Alexey Antonov, Ch. Höppner, A. Bravar, J. Lichtenstadt, S. Platchkov, S. Sosio, M. Ostrick, E. M. Kabuß, V.Yu. Alexakhin, K. Bicker, W. Eyrich, W. Schröder, Nour Makke, J.H. Koivuniemi, J. Bieling, N. I. Zhuravlev, Yu. Ivanshin, P. Bordalo, R. Sulej, D. Kang, Federica Sozzi, I.A. Savin, E. Perevalova, O.Yu. Denisov, F. Kunne, C. Franco, M. Stolarski, N. dʼHose, A. Morreale, R. Jahn, A. Korzenev, M. Quaresma, S. Schopferer, V. Rapatsky, P. Schiavon, P. Jasinski, E. Burtin, J.M. Friedrich, J. Bisplinghoff, S.S. Dasgupta, T. Negrini, R. Panknin, N.S. Rossiyskaya, T. Nagel, J. Pretz, Vladimir Nikolaenko, W.-D. Nowak, R. Joosten, M.G. Sapozhnikov, M. V. Zavertyaev, V.F. Konstantinov, Miroslav Sulc, F. Hinterberger, M. Virius, J. ter Wolbeek, A.A. Lednev, W. Meyer, Maria Liz Crespo, E. Zemlyanichkina, S. Ishimoto, L. Capozza, D.V. Peshekhonov, K. Kondo, H. Fischer, T. Michigami, A. Grasso, J. Barth, C. Marchand, Y. Bedfer, G. Pesaro, M.G. Alekseev, F. Nerling, G. Jegou, A. Sandacz, R. Gushterski, I. Gnesi, V. Jary, K. Königsmann, T. Guthörl, Yu. Alexandrov, Gerhard K. Mallot, K. Schmidt, Bakur Parsamyan, A. Nagaytsev, F. Balestra, S. Takekawa, Oleg V. Ivanov, Norihiro Doshita, H. Wollny, A. Maggiora, R. Birsa, S. Das, A.G. Olshevsky, A. N. Sissakian, D. Neyret, V.N. Kolosov, A. Mutter, N.V. Vlassov, J. Marzec, Günter Baum, O.Yu. Shevchenko, S. Levorato, R. Garfagnini, M. Finger, S. Gerassimov, N. Horikawa, K. Klimaszewski, V.D. Samoylenko, Sergey Donskov, Andres Cicuttin, G. Reicherz, A. Mann, S. Tessaro, S. Dalla Torre, Achim Richter, F. Haas, R. Geyer, Christian Schill, Yu.A. Khokhlov, S. Ramos, L. Wang, P. Sznajder, D. von Harrach, A. Lehmann, Maxence Vandenbroucke, L. G. Tkatchev, C. Heß, Yu.V. Mikhailov, Takahiro Iwata, I. Uman, Johannes Bernhard, A. Guskov, M. Bettinelli, Andrea Bressan, F. Tessarotto, G.V. Meshcheryakov, V. Frolov, Soumen Paul, Matthias Schott, and C. Adolph
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Angular momentum, Muon, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Spin-½
Abstract: The transverse target spin azimuthal asymmetry A(UT)(sin(phi-phi s)) in hard exclusive production of rho(0) mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E-q, which are related to the orbital angular momentum of quarks in the nucleon. The Q(2), x-B-j and p(T)(2) dependence of A(UT)(sin(phi-phi s)) is presented in a wide kinematic range: 1 (GeV/c)(2) < Q(2) < 10 (GeV/c)(2), 0.003 < xB(j) < 0.3 and 0.05 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for protons or 0.10 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for deuterons. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E-u and E-d approximately cancel. (C) 2012 Elsevier B.V. All rights reserved.
Published: 2012
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44. The MPD detector at the NICA heavy-ion collider at JINR

Author: O.M. Listratenko, K. I. Davkov, E.I. Litvinenko, P. Polozov, V.M. Slepnev, V. Peresedov, A. Raportirenko, I. A. Tyapkin, M. Protsenko, Kyrill A. Bugaev, F.F. Guber, N. Gorbunov, L.V. Kravchuck, I.A. Polenkevich, V.S. Alfeev, M. Merkin, I.N. Goncharov, Vitaly Pronskikh, Sergei Afanasiev, V.N. Zrjuev, V. I. Davkov, A. Ivashkin, V. I. Kolesnikov, V.M. Lucenko, I. Tymchuk, L. I. Sarycheva, V. Jejer, E. E. Boos, I. Geshkov, N. Krahotin, M.S. Prokudin, A. Guskov, V. B. Dunin, V.A. Babkin, V. M. Lysan, Hamlet Khodzhibagiyan, O.P. Gavrischuk, S.V. Sergeev, M. Kadykov, D. Madigozhin, V.M. Golovatyuk, Vladimir Borisov, S.P. Lobastov, M.B. Golubeva, O.A. Denisovskaia, David Blaschke, Z. Sadygov, Liudmila Malinina, V. I. Yurevich, A.V. Shabunov, S. Razin, A.G. Litvinenko, Grigory Trubnikov, Andrey Reshetin, S. P. Chernenko, V. D. Toneev, L. G. Efimov, A.A. Savenkov, K. Mikhailov, E. Egorov, D.E. Donetz, Nikolai Shumeiko, B.G. Shchinov, Viktor Matveev, I. Stamenov, D. Drnojan, V. F. Chepurnov, N. Anfimov, S.V. Volgin, Gennady Zinovjev, V. Zherebchevskiy, Alexander Sorin, D.N. Bogoslovsky, Oleg Teryaev, V. Mialkovski, B. Grinyov, A. Stavinskiy, Konstantin K. Gudima, Yu.V. Zanevsky, Igor Meshkov, O. Rogachevsky, Tatiana Karavicheva, V.V. Chalyshev, A. V. Friesen, S.N. Igolkin, I. Slepnev, Anatoly Sidorin, S. Ya. Sychkov, I.V. Boguslavski, V.V. Tichomirov, I.E. Chirikov-Zorin, Vladimir Kekelidze, V. Lazarev, N.M. Vladimirova, I.I. Migulina, V. A. Nikitin, Alexander Malakhov, T.M. Solovjeva, N. A. Molokanova, Yu.I. Fedotov, G.J. Musulmanbekov, G. Sharkov, J. Lukstins, D.A. Bliznyuk, Vladimir Peshekhonov, A. Yukaev, A.I. Zinchenko, F. Zazulia, S.N. Bazylev, Vl.F. Chepurnov, P. Zhmurin, D. A. Arkhipkin, G. A. Feofilov, Yu. Potrebenikov, Alexey Kurepin, S. Petrushanko, D.K. Dryablov, V.N. Borshchov, A. N. Sissakian, Andrey Butenko, R.Ya. Zul'karneev, Vladimir Korotkikh, Alexander Snigirev, Yu. Murin, Alexander Kovalenko, Yu.T. Kiryushin, G. D. Kekelidze, G.A. Cheremukhina, S. A. Movchan, A. G. Olshevski, V.I. Voskoboinik, N.A. Kuz’min, D.D. Emelyanov, Yu.R. Zulkarneeva, P. Zh. Aslanyan, Kh.U. Abraamyan, S.S. Tolstoukhov, M. I. Baznat, R. Lednitsky, A. A. Voronin, Viatcheslav Stolin, A.O. Kechechyan, Alla Maevskaya, Igor Lokhtin, A. Sadovsky, Yu. A. Gornushkin, Z. Krumshtein, D.V. Peshekhonov, A. Yu. Isupov, and O. V. Fateev
Subjects: Physics, Nuclear and High Energy Physics, Nuclotron, Particle physics, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking system, Tracking (particle physics), Particle identification, law.invention, Nuclear physics, Electromagnetic calorimeter, law, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, business, Collider, Instrumentation
Abstract: The MultiPurpose Detector (MPD) is designed to study heavy-ion collisions at the Nuclotron-based heavy Ion Collider fAcility (NICA) at JINR, Dubna. Its main components located inside a superconducting solenoid are a tracking system composed of a silicon microstrip vertex detector followed by a large volume time-projection chamber, a time-of-flight system for particle identification and a barrel electromagnetic calorimeter. A zero degree hadron calorimeter is designed specifically to measure the energy of spectators. In this paper, all parts of the apparatus are described and their tracking and particle identification (PID) parameters are discussed in some detail.
Published: 2011
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45. Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Author: M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, D. Chaberny, M. Chiosso, S.U. Chung, A. Cicuttin, M. Colantoni, M.L. Crespo, S. Dalla Torre, S. Das, S.S. Dasgupta, O.Yu. Denisov, L. Dhara, V. Diaz, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, A. El Alaoui, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, J.M. Friedrich, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. von Harrach, T. Hasegawa, F.H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch. Höppner, N. d'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V.F. Konstantinov, A. Korzenev, A.M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z.V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, L. Lauser, J.M. Le Goff, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, N. Makke, G.K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, F. Massmann, T. Matsuda, W. Meyer, T. Michigami, Yu.V. Mikhailov, M.A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, A.S. Nunes, A.G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D.V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J.-F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, H. Santos, M.G. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, L. Schmitt, S. Schopferer, W. Schröder, O.Yu. Shevchenko, H.-W. Siebert, L. Silva, L. Sinha, A.N. Sissakian, M. Slunecka, G.I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L.G. Tkatchev, S. Uhl, I. Uman, M. Virius, N.V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrovo, Y. u., G. D., Alexeev, A., Amoroso, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, A., Bravar, Bressan, Andrea, G., Brona, E., Burtin, M. P., Bussa, D., Chaberny, M., Chiosso, S. U., Chung, A., Cicuttin, M., Colantoni, M. L., Crespo, S., Dalla Torre, S., Da, S. S., Dasgupta, Denisov, O. Y. u., L., Dhara, V., Diaz, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dunnweber, A., Efremov, A., El Alaoui, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger J., R., H., Fischeri, C., Franco, J. M., Friedrich, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, R., Gazda, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmuller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, F., Haa, D., von Harrach, T., Hasegawa, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoppner, C. h., N., D’Hose, C., Ilgnerj, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, P., Jasinski, G., Jegou, R., Joosten, E., Kabu, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Konigsmann, R., Konopka, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, K., Kowalik, M., Kramer, A., Kral, Z. V., Kroumchtein, R., Kuhn, F., Kunne, K., Kurek, L., Lauseri, J. M., Le Goff, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, M., Maggiora, A., Magnon, N., Makke, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, F., Massmann, T., Matsuda, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Mutteri, A., Nagaytsev, T., Nagel, J., Nassalski, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, B., Pawlukiewicz Kaminska, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, G., Pontecorvo, J., Pretz, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, F., Robinet, E., Rocco, E., Rondio, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, H., Santo, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schluter, L., Schmitt, S., Schopfereri, W., Schroder, Shevchenko, O. Y. u., H. W., Siebert, L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, M., Stolarskij, M., Sulc, R., Sulej, Takekawa, Stefano, S., Tessaro, F., Tessarotto, A., Teufel, L. G., Tkatchev, S., Uhl, I., Uman, M., Viriu, N. V., Vlassov, A., Vossen, Q., Weitzel, R., Windmolder, W., Wi´slicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, J., Zhao, N., Zhuravlev, and A., Zvyagin
Subjects: Quark, Nuclear and High Energy Physics, Proton, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, COMPASS, 01 natural sciences, Asymmetry, Semi-inclusive deep inelastic scattering, Spin, Structure function, Parton distribution functions, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, COMPASS experiment, Nuclear Experiment, 010306 general physics, Spin-½, media_common, Physics, function, Muon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Structure, Helicity, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH_3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, \Delta u-bar - \Delta d-bar, is found to be slightly positive, about 1.5 standard deviations away from zero., Comment: 13 pages, 5 figures
Published: 2010
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46. The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule

Author: P. Schiavon, I. Konorov, C. Hess, Miroslav Sulc, M. Ziembicki, F. Hinterberger, F.H. Heinsius, Achim Richter, A. Magnon, F. Massmann, S. Ramos, Norihiro Doshita, N. d'Hose, Alan D. Martin, D. Kang, K. Königsmann, Soumen Paul, T. Hasegawa, E. Rondio, A. Austregesilo, R. Gazda, A. Maggiora, E. Perevalova, R. Kuhn, A. N. Sissakian, S. Das, A.G. Olshevsky, R. Jahn, A. Ferrero, A. Maximov, C. Quintans, D. Cotic, M.P. Bussa, V.D. Samoylenko, O.P. Gavrichtchouk, Vladimir A. Polyakov, D. Neyret, Elena Rocco, J. Polak, W. Kafer, J.H. Koivuniemi, R. Joosten, L. Sinha, S. Neubert, A. Korzenev, T. Matsuda, K. Zaremba, Laura Silva, A.A. Lednev, A. Mutter, A. Lehmann, J. Ball, J. M. Le Goff, S. Platchkov, O. Kouznetsov, Yu.V. Mikhailov, A. Král, R. Windmolders, S. Sarkar, R. Bertini, Franco Bradamante, B. Pawlukiewicz-Kaminska, S.S. Dasgupta, M. V. Zavertyaev, C. Marchand, V. Rapatsky, A. Nagaytsev, F. Balestra, A. Srnka, L. Lauser, S. Grabmüller, W. Wislicki, J. Pochodzalla, V. Duic, G. Sbrizzai, A. Padee, F. Tessarotto, Moinester, P. Jasinski, O.Yu. Denisov, V. Diaz, T. Negrini, J. Marzec, G. Piragino, S. Uhl, P.D. Eversheim, G.B. Pontecorvo, K. Klimaszewski, M. Maggiora, P. Bordalo, F. Nerling, A. Amoroso, M. Chiosso, F. Haas, R. Geyer, Jean-Francois Rajotte, Takahiro Iwata, D.I. Ryabchikov, D. von Harrach, M. Giorgi, A.S. Nunes, S. Koblitz, Andres Cicuttin, L. Schmitt, T. Nagel, D. Panzieri, J. Pretz, T. Schlüter, A. El Alaoui, S. Gerassimov, M. Krämer, N. Horikawa, J. Zhao, K. Kondo, M.G. Alekseev, Sergey Donskov, T. Liška, G. Reicherz, H.-W. Siebert, F. Kunne, R. Gushterski, W. Eyrich, M. Virius, S. Tessaro, V.F. Konstantinov, Johannes Bernhard, A. Guskov, Y. Bedfer, G.V. Khaustov, A. Zvyagin, T. Michigami, S. Dalla Torre, E. Burtin, H. Santos, Q. Weitzel, M. Bettinelli, M. Slunecka, A. Sandacz, B. Gobbo, I.A. Savin, Andrea Bressan, W. Schröder, N. I. Zhuravlev, Ch. Höppner, Yu.A. Khokhlov, A. M. Kotzinian, W. Meyer, Maria Liz Crespo, H. Fischer, M. L. Colantoni, C. Ilgner, J. Barth, R. Konopka, A. Teufel, S. Schopferer, N.V. Vlassov, Günter Baum, M.G. Sapozhnikov, O.Yu. Shevchenko, S. Levorato, Yu. Kisselev, D. Chaberny, S.-U. Chung, V.N. Kolosov, V.I. Nikolaenko, D.V. Peshekhonov, J. Marroncle, A.V. Efremov, R. Garfagnini, Z.V. Kroumchtein, François Herrmann, A. Bravar, A. Mann, M. Ostrick, G. Jegou, K. Kurek, E. Kabuss, Oleg V. Ivanov, R. Hermann, H. Wollny, S. Sosio, Christian Schill, I. Uman, G. Pesaro, S. Takekawa, Yu. Alexandrov, J. Lichtenstadt, M. Stolarski, I. Gnesi, Bakur Parsamyan, G.I. Smirnov, Fabrice Gautheron, M. A. Faessler, R. Panknin, V.Yu. Alexakhin, A. Grasso, R. Sulej, M. Finger, C. Franco, R. Birsa, G. D. Alexeev, W. Dünnweber, J.M. Friedrich, J. Bisplinghoff, E. Zemlyanichkina, L. Dhara, B. Badelek, B. Ketzer, F. Robinet, A. Filin, Grzegorz Brona, Gerhard K. Mallot, A. Vossen, F. Sozzi, J. Nassalski, S. Ishimoto, Frank Klein, K. Kowalik, Yu. Ivanshin, L. G. Tkatchev, S. Goertz, and B. Grube
Subjects: Quantum chromodynamics, Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Muon, Isovector, Proton, 010308 nuclear & particles physics, Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Sum rule in quantum mechanics, 010306 general physics, Spin-½
Abstract: The inclusive double-spin asymmetry, A 1 p , has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q 2 > 1 ( GeV / c ) 2 , 0.004 x 0.7 and improve the statistical precision of g 1 p ( x ) by a factor of two in the region x 0.02 . The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g 1 NS ( x , Q 2 ) . The isovector quark density, Δ q 3 ( x , Q 2 ) , is evaluated from a NLO QCD fit of g 1 NS . The first moment of Δ q 3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | g A / g V | = 1.28 ± 0.07 ( stat . ) ± 0.10 ( syst. ) .
Published: 2010
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47. Development of segmented straws for very high-rate capability coordinate detector

Author: G. D. Kekelidze, L. Naumann, D.V. Peshekhonov, V. O. Tikhomirov, V. I. Davkov, A. A. Savenkov, K. S. Viryasov, K. I. Davkov, R. Geyer, Yu. V. Gusakov, Vladimir Peshekhonov, and V. V. Myalkovskiy
Subjects: Small occupancy, Physics, High rate, Nuclear and High Energy Physics, Tracking detector, Physics::Instrumentation and Detectors, business.industry, High granularity, Detector, Radiation, Tracking (particle physics), Anode, Straw-drift chamber, High Energy Physics::Experiment, Development (differential geometry), Granularity, business, Instrumentation, Computer hardware
Abstract: To reduce the occupancy of the large-size coordinate detectors, the high-granularity straw tracking chamber has been designed and tested. The main tasks were to improve the detector granularity and provide the best value of the detector radiation thickness. We have developed the techniques of the multiple anode production, assembling of the segmented straws and the low-mass readout by means of flat cable. Testing of the constructed prototypes has shown that these techniques can be applied to build the high-granularity straw detectors.
Published: 2008
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48. Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$

Author: M. Grosse Perdekamp, N.S. Rossiyskaya, I.A. Savin, Jen-Chieh Peng, A. Grasso, M. Wilfert, C. Quintans, S. Grabmüller, R. Kuhn, K. Klimaszewski, O.Yu. Denisov, F. Kunne, P.D. Eversheim, S. Takekawa, R. Beck, R. Akhunzyanov, G. D. Alexeev, M. Chiosso, R. Hashimoto, R.P. Kurjata, J. Pochodzalla, P. Bordalo, H. Suzuki, C.D.R. Azevedo, F. Pereira, K. Kondo, R. Jahn, K. Kurek, O. Kouznetsov, Franco Bradamante, V. Anosov, C. Regali, Andres Cicuttin, Fabrice Gautheron, P. Schiavon, G.V. Meshcheryakov, P. Montuenga, S. Gerassimov, N. Horikawa, F. Tosello, B. Marianski, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, T. Matsuda, A. Zink, I. Orlov, V.D. Samoylenko, G. Reicherz, Yu. V. Mikhailov, S. Sirtl, Celso Augusto Guimarães Santos, J. Pretz, Bakur Parsamyan, I. Konorov, S.S. Dasgupta, S. Dalla Torre, H. Matsuda, M. Boer, L. Dhara, C. Braun, S. Tessaro, D. Hahne, M.G. Alexeev, M. V. Zavertyaev, S. Platchkov, Z.V. Kroumchtein, N. du Fresne von Hohenesche, M. Levillain, C.-Y. Hsieh, V. Frolov, Soumen Paul, T. Szameitat, B. Badelek, S. Uhl, Michal Dziewiecki, A. Magnon, C. Marchand, C. Adolph, P. Kremser, D.I. Ryabchikov, B. Ketzer, Yu.A. Khokhlov, A. Srnka, F. Nerling, R. Joosten, S. Sarkar, G. Nukazuka, Andrea Ferrero, M. Faessler, M. Stolarski, M. Gorzellik, S. V. Donskov, M. Pešek, I. J. Choi, V.I. Nikolaenko, Yu. Kisselev, A.S. Nunes, Johannes Bernhard, A. Guskov, D. Panzieri, Janusz Marzec, A.G. Olshevsky, M. Ostrick, T. Grussenmeyer, S. Dasgupta, A. Austregesilo, B. Grube, E.R. Bielert, F. Krinner, Laura Silva, A.V. Efremov, K. Zaremba, V.A. Polyakov, Andrea Bressan, Miroslav Sulc, F. Hinterberger, W. Augustyniak, S. Ramos, J.F.C.A. Veloso, Y. Miyachi, A.A. Lednev, G. Sbrizzai, Frank Klein, M. Virius, Q. Curiel, P. Sznajder, D. Neyret, T. Michigami, H. Schmieden, A. Amoroso, M. Büchele, A. Lehmann, J.M. Friedrich, J. Nový, N. Kuchinski, J.H. Koivuniemi, K. Königsmann, S.-U. Chung, R. Birsa, J. Bisplinghoff, A. Sandacz, K. Bicker, A. Maggiora, Yu. Ivanshin, S. Huber, V. Duic, Takahiro Iwata, W. Dünnweber, E. Zemlyanichkina, K. Schmidt, François Herrmann, M. Ziembicki, P. Jörg, Norihiro Doshita, N. d'Hose, A. Rychter, Aram Kotzinian, R. Longo, V.N. Kolosov, K. Schönning, F. H. Heinsius, O.Yu. Shevchenko, S. Levorato, M. Slunecka, Alexandr Selyunin, G.V. Khaustov, J. ter Wolbeek, W. Eyrich, C. Franco, Naomi C R Makins, Nour Makke, W. C. Chang, Y. Bedfer, F. Tessarotto, Federica Sozzi, M. Krämer, S. Schopferer, M. Quaresma, M. Finger, W.-D. Nowak, D.V. Peshekhonov, Anne-Laure Martin, E. Fuchey, I. Gnesi, F. Giordano, E. Burtin, Jan Matousek, V.F. Konstantinov, J. Lichtenstadt, S. Ishimoto, H. Fischer, V. Andrieux, Adam Szabelski, V. Tskhay, A. Nagaytsev, F. Balestra, W. Meyer, Maria Liz Crespo, V. Jary, Andrew Ivanov, D. von Harrach, F. Thibaud, J. Barth, Gerhard K. Mallot, T. Weisrock, F. Haas, C. Riedl, E. M. Kabuß, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Courant Institute of Mathematical Sciences [New York] (CIMS), New York University [New York] (NYU), NYU System (NYU)-NYU System (NYU), National Center for High-Performance Computing, Max-Planck-Institut für Radioastronomie (MPIFR), Department of Mathematics, King's College London, IBM Research [Zurich], Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), DCC - Departemento de Ciencias da Computação, Universidade Federal de Minas Gerais = Federal University of Minas Gerais [Belo Horizonte, Brazil] (UFMG), Centre de recherche et de restauration des musées de France (C2RMF), Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Federal University of Minas Gerais (UFMG), Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC), Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, Renato, Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Chang, W. C., Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Yu, Dhara, L., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuchinski, N., Kuhn, R., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marchand, C., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Nový, J., Nowak, W. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pešek, M., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Selyunin, A., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, Tessaro, S., Tessarotto, Fulvio, Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, High pT, Hadron, Nuclear Theory, COMPASS, Deep inelastic scattering, Double spin asymmetry, δG, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Lambda, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, lcsh:QC1-999, Gluon, High Energy Physics - Phenomenology, Deuterium, High Energy Physics::Experiment, Nucleon, lcsh:Physics, Particle Physics - Experiment
Abstract: We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$. We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2
Published: 2016
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49. The COMPASS experiment at CERN

Author: P. Abbon, E. Albrecht, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, M.G. Alekseev, A. Amoroso, H. Angerer, V.A. Anosov, B. Badełek, F. Balestra, J. Ball, J. Barth, G. Baum, M. Becker, Y. Bedfer, P. Berglund, C. Bernet, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, M. Bosteels, F. Bradamante, A. Braem, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, V.N. Bytchkov, M. Chalifour, A. Chapiro, M. Chiosso, P. Ciliberti, A. Cicuttin, M. Colantoni, A.A. Colavita, S. Costa, M.L. Crespo, P. Cristaudo, T. Dafni, N. d’Hose, S. Dalla Torre, C. d’Ambrosio, S. Das, S.S. Dasgupta, E. Delagnes, R. De Masi, P. Deck, N. Dedek, D. Demchenko, O.Yu. Denisov, L. Dhara, V. Diaz, N. Dibiase, A.M. Dinkelbach, A.V. Dolgopolov, A. Donati, S.V. Donskov, V.A. Dorofeev, N. Doshita, D. Durand, V. Duic, W. Dünnweber, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, V. Falaleev, P. Fauland, A. Ferrero, L. Ferrero, M. Finger, H. Fischer, C. Franco, J. Franz, F. Fratnik, J.M. Friedrich, V. Frolov, U. Fuchs, R. Garfagnini, L. Gatignon, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, J.M. Gheller, A. Giganon, M. Giorgi, B. Gobbo, S. Goertz, A.M. Gorin, F. Gougnaud, S. Grabmüller, O.A. Grajek, A. Grasso, B. Grube, A. Grünemaier, A. Guskov, F. Haas, R. Hagemann, J. Hannappel, D. von Harrach, T. Hasegawa, J. Heckmann, S. Hedicke, F.H. Heinsius, R. Hermann, C. Heß, F. Hinterberger, M. von Hodenberg, N. Horikawa, S. Horikawa, I. Horn, C. Ilgner, A.I. Ioukaev, S. Ishimoto, I. Ivanchin, O. Ivanov, T. Iwata, R. Jahn, A. Janata, R. Joosten, N.I. Jouravlev, E. Kabuß, V. Kalinnikov, D. Kang, F. Karstens, W. Kastaun, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, J. Kiefer, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, E.V. Komissarov, K. Kondo, K. Königsmann, A.K. Konoplyannikov, I. Konorov, V.F. Konstantinov, A.S. Korentchenko, A. Korzenev, A.M. Kotzinian, N.A. Koutchinski, O. Kouznetsov, K. Kowalik, D. Kramer, N.P. Kravchuk, G.V. Krivokhizhin, Z.V. Kroumchtein, J. Kubart, R. Kuhn, V. Kukhtin, F. Kunne, K. Kurek, N.A. Kuzmin, M. Lamanna, J.M. Le Goff, M. Leberig, A.A. Lednev, A. Lehmann, V. Levinski, S. Levorato, V. I Lyashenko, J. Lichtenstadt, T. Liska, I. Ludwig, A. Maggiora, M. Maggiora, A. Magnon, G.K. Mallot, A. Mann, I.V. Manuilov, C. Marchand, J. Marroncle, A. Martin, J. Marzec, L. Masek, F. Massmann, T. Matsuda, D. Matthiä, A.N. Maximov, G. Menon, W. Meyer, A. Mielech, Yu.V. Mikhailov, M.A. Moinester, F. Molinié, F. Mota, A. Mutter, T. Nagel, O. Nähle, J. Nassalski, S. Neliba, F. Nerling, D. Neyret, M. Niebuhr, T. Niinikoski, V.I. Nikolaenko, A.A. Nozdrin, A.G. Olshevsky, M. Ostrick, A. Padee, P. Pagano, S. Panebianco, B. Parsamyan, D. Panzieri, S. Paul, B. Pawlukiewicz, H. Pereira, D.V. Peshekhonov, V.D. Peshekhonov, D. Piedigrossi, G. Piragino, S. Platchkov, K. Platzer, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, A.A. Popov, J. Pretz, S. Procureur, C. Quintans, J.-F. Rajotte, S. Ramos, I. Razaq, P. Rebourgeard, D. Reggiani, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, L. Ropelewski, J.Y. Roussé, A.M. Rozhdestvensky, D. Ryabchikov, A.G. Samartsev, V.D. Samoylenko, A. Sandacz, M. Sans Merce, H. Santos, M.G. Sapozhnikov, F. Sauli, I.A. Savin, P. Schiavon, C. Schill, T. Schmidt, H. Schmitt, L. Schmitt, P. Schönmeier, W. Schroeder, D. Seeharsch, M. Seimetz, D. Setter, A. Shaligin, O.Yu. Shevchenko, A.A. Shishkin, H.-W. Siebert, L. Silva, F. Simon, L. Sinha, A.N. Sissakian, M. Slunecka, G.I. Smirnov, D. Sora, S. Sosio, F. Sozzi, A. Srnka, F. Stinzing, M. Stolarski, V.P. Sugonyaev, M. Sulc, R. Sulej, G. Tarte, N. Takabayashi, V.V. Tchalishev, S. Tessaro, F. Tessarotto, A. Teufel, D. Thers, L.G. Tkatchev, T. Toeda, V.V. Tokmenin, S. Trippel, J. Urban, R. Valbuena, G. Venugopal, M. Virius, N.V. Vlassov, A. Vossen, M. Wagner, R. Webb, E. Weise, Q. Weitzel, U. Wiedner, M. Wiesmann, R. Windmolders, S. Wirth, W. Wiślicki, H. Wollny, A.M. Zanetti, K. Zaremba, M. Zavertyaev, J. Zhao, R. Ziegler, M. Ziembicki, Y.L. Zlobin, A. Zvyagin, Abbon, P, Albrecht, E, ALEXAKHIN V., Yu, Alexandrov, Yu, ALEXEEV G., D, ALEKSEEV M., G, Amoroso, A, Angerer, H, ANOSOV V., A, Badelek, B, Balestra, F, Ball, J, Barth, J, Baum, G, Becker, M, Bedfer, Y, Berglund, P, Bernet, C, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bosteels, M, Bradamante, Franco, Braem, A, Bravar, A, Bressan, Andrea, Brona, G, Burtin, E, BUSSA M., P, BYTCHKOV V., N, Chalifour, M, Chapiro, A, Chiosso, M, Ciliberti, Piero, Cicuttin, A, Colantoni, M, COLAVITA A., A, Costa, S, CRESPO M., L, Cristaudo, P, Dafni, T, D'Hose, N, DALLA TORRE, S, D'Ambrosio, C, Das, S, DASGUPTA S., S, Delagnes, E, DE MASI, R, Deck, P, Dedek, N, Demchenko, D, DENISOV O., Yu, Dhara, L, Diaz, V, Dibiase, N, DINKELBACH A., M, DOLGOPOLOV A., V, Donati, A, DONSKOV S., V, DOROFEEV V., A, Doshita, N, Durand, D, Duic, V, Dünnweber, W, Efremov, A, EVERSHEIM P., D, Eyrich, W, Faessler, M, Falaleev, V, Fauland, P, Ferrero, A, Ferrero, L, Finger, M, FINGER M., Jr, Fischer, H, Franco, C, Franz, J, Fratnik, F, FRIEDRICH J., M, Frolov, V, Fuchs, U, Garfagnini, R, Gatignon, L, Gautheron, F, GAVRICHTCHOUK O., P, Gerassimov, S, Geyer, R, GHELLER J., M, Giganon, A, Giorgi, Marcello, Gobbo, B, Goertz, S, GORIN A., M, Gougnaud, F, Grabmüller, S, GRAJEK O., A, Grasso, A, Grube, B, Grünemaier, A, Guskov, A, Haas, F, Hagemann, R, Hannappel, J, VON HARRACH, D, Hasegawa, T, Heckmann, J, Hedicke, S, HEINSIUS F., H, Hermann, R, Hess, C, Hinterberger, F, VON HODENBERG, M, Horikawa, N, Horikawa, S, Horn, I, Ilgner, C, IOUKAEV A., I, Ishimoto, S, Ivanchin, I, Ivanov, O, Iwata, T, Jahn, R, Janata, A, Joosten, R, JOURAVLEV N., I, Kabuss, E, Kalinnikov, V, Kang, D, Karstens, F, Kastaun, W, Ketzer, B, KHAUSTOV G., V, KHOKHLOV Y. U., A, Kiefer, J, Kisselev, Yu, Klein, F, Klimaszewski, K, Koblitz, S, KOIVUNIEMI J., H, KOLOSOV V., N, KOMISSAROV E., V, Kondo, K, Königsmann, K, KONOPLYANNIKOV A., K, Konorov, I, KONSTANTINOV V., F, KORENTCHENKO A., S, Korzenev, A, KOTZINIAN A., M, KOUTCHINSKI N., A, Kouznetsov, O, Kowalik, K, Kramer, D, KRAVCHUK N., P, KRIVOKHIZHIN G., V, KROUMCHTEIN Z., V, Kubart, J, Kuhn, R, Kukhtin, V, Kunne, F, Kurek, K, KUZMIN N., A, Lamanna, M, LE GOFF J., M, Leberig, M, LEDNEV A., A, Lehmann, A, Levinski, V, Levorato, Stefano, I., LYASHENKO V, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, MALLOT G., K, Mann, A, MANUILOV I., V, Marchand, C, Marroncle, J, Martin, Anna, Marzec, J, Masek, L, Massmann, F, Matsuda, T, Matthiä, D, MAXIMOV A., N, Menon, G, Meyer, W, Mielech, A, MIKHAILOV Y. U., V, MOINESTER M., A, Molinié, F, Mota, F, Mutter, A, Nagel, T, Nähle, O, Nassalski, J, Neliba, S, Nerling, F, Neyret, D, Niebuhr, M, Niinikoski, T, NIKOLAENKO V., I, NOZDRIN A., A, OLSHEVSKY A., G, Ostrick, M, Padee, A, Pagano, P, Panebianco, S, Parsamyan, B, Panzieri, D, Paul, S, Pawlukiewicz, B, Pereira, H, PESHEKHONOV D., V, PESHEKHONOV V., D, Piedigrossi, D, Piragino, G, Platchkov, S, Platzer, K, Pochodzalla, J, Polak, J, POLYAKOV V., A, Pontecorvo, G, POPOV A., A, Pretz, J, Procureur, S, Quintans, C, RAJOTTE J., F, Ramos, S, Razaq, I, Rebourgeard, P, Reggiani, D, Reicherz, G, Richter, A, Robinet, F, Rocco, E, Rondio, E, Ropelewski, L, ROUSSÉ J., Y, ROZHDESTVENSKY A., M, Ryabchikov, D, SAMARTSEV A., G, SAMOYLENKO V., D, Sandacz, A, SANS MERCE, M, Santos, H, SAPOZHNIKOV M., G, Sauli, F, SAVIN I., A, Schiavon, Paolo, Schill, C, Schmidt, T, Schmitt, H, Schmitt, L, Schönmeier, P, Schroeder, W, Seeharsch, D, Seimetz, M, Setter, D, Shaligin, A, SHEVCHENKO O., Yu, SHISHKIN A., A, SIEBERT H., W, Silva, L, Simon, F, Sinha, L, SISSAKIAN A., N, Slunecka, M, SMIRNOV G., I, Sora, D, Sosio, S, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, SUGONYAEV V., P, Sulc, M, Sulej, R, Tarte, G, Takabayashi, N, TCHALISHEV V., V, Tessaro, S, Tessarotto, F, Teufel, A, Thers, D, TKATCHEV L., G, Toeda, T, TOKMENIN V., V, Trippel, S, Urban, J, Valbuena, R, Venugopal, G, Virius, M, VLASSOV N., V, Vossen, A, Wagner, M, Webb, R, Weise, E, Weitzel, Q, Wiedner, U, Wiesmann, M, Windmolders, R, Wirth, S, Wisblicki, W, Wollny, H, ZANETTI A., M, Zaremba, K, Zavertyaev, M, Zhao, J, Ziegler, R, Ziembicki, M, ZLOBIN Y., L, and Zvyagin, A.
Subjects: Nuclear and High Energy Physics, straw tube detector, Physics::Instrumentation and Detectors, Project commissioning, FOS: Physical sciences, fixed-target experiment, RICH detector, hadron structure, High Energy Physics - Experiment, target, MWPC, Nuclear physics, High Energy Physics - Experiment (hep-ex), Compass, Hadron spectroscopy, COMPASS experiment, scintillating fibre detector, Nuclear Experiment, silicon microstrip detectors, Instrumentation, Silicon microstrip detectors, Physics, Large Hadron Collider, Structure function, MicroMegas detector, front-end electronics, DAQ, micromegas detector, drift chamber, Physics::Accelerator Physics, High Energy Physics::Experiment, polarised, GEM detector, calorimetry, Particle Physics - Experiment, polarised DIS
Abstract: The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. A large polarized target inside a superconducting solenoid is used for the measurements with the muon beam. Outgoing particles are detected by a two-stage, large angle and large momentum range spectrometer. The setup is built using several types of tracking detectors, according to the expected incident rate, required space resolution and the solid angle to be covered. Particle identification is achieved using a RICH counter and both hadron and electromagnetic calorimeters. The setup has been successfully operated from 2002 onwards using a muon beam. Data with a hadron beam were also collected in 2004. This article describes the main features and performances of the spectrometer in 2004; a short summary of the 2006 upgrade is also given., 84 papes, 74 figures
Published: 2007
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50. Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2

Author: Aram Kotzinian, R. Windmolders, M.G. Sapozhnikov, S. Neliba, L. Schmitt, A. Janata, J. Zhao, E. Burtin, J. Lichtenstadt, R. Geyer, D.V. Peshekhonov, P. Schiavon, V.F. Konstantinov, Q. Weitzel, J. Pretz, L. Ferrero, H. Fischer, A.G. Olshevsky, T. Hasegawa, S. Procureur, R. Ziegler, Yu. Alexandrov, A. Chapiro, M. Fabro, V.F. Obraztsov, M. Maggiora, K. Zaremba, D. Neyret, G.I. Smirnov, Fabrice Gautheron, M. A. Faessler, V.A. Polyakov, R. C. Webb, A. Mielech, S. Ishimoto, Frank Klein, Andres Cicuttin, A. Amoroso, G. Reicherz, J. Marzec, St. Goertz, V.Yu. Alexakhin, A. Korzenev, Colin Bernet, Massimo Lamanna, Yu. Kisselev, A. Sandacz, A. Srnka, R. Sulej, C. Ilgner, S. Platchkov, S. Dalla Torre, V.P. Sugonyaev, N.P. Kravchuk, A. Bravar, M. Ostrick, I. Konorov, M. Stolarski, C. Quintans, Grzegorz Brona, Gerhard K. Mallot, A. Zvyagin, Murray Moinester, S. Ramos, Alessandro Bressan, F. Tessarotto, E. M. Kabuß, A.M. Rozhdestvensky, N. V. Khomutov, A. Gorin, I.A. Savin, T. Matsuda, T. Iwata, Z.V. Kroumchtein, F. Sozzi, D. von Harrach, F. Balestra, Franco Bradamante, F.H. Heinsius, Norihiro Doshita, S. Gerassimov, W. Eyrich, J. Ball, L. G. Tkatchev, V. Falaleev, N. Horikawa, H.-W. Siebert, Yu.V. Mikhailov, S. Koblitz, N. d'Hose, E.V. Komissarov, A. Grasso, Sergey Donskov, S. Paul, V. Diaz Kavka, R. Jahn, A. Magnon, A. N. Sissakian, B. Grube, D. Panzieri, J. Nassalski, O.Yu. Denisov, T. Liška, Yu.A. Khokhlov, I. Ludwig, R. Joosten, K. Kurek, G. D. Alexeev, O.A. Grajek, Miroslav Sulc, F. Hinterberger, C. Marchand, A. Maximov, W. Dünnweber, M. Virius, J.M. Friedrich, V.D. Samoylenko, E. Weise, J. Pochodzalla, M.L. Colantoni, S. Hedicke, O.P. Gavrichtchouk, L. Sinha, J. Marroncle, S.S. Dasgupta, N. Takabayashi, J. Bisplinghoff, A.I. Ioukaev, E. Rondio, K. Kondo, R. De Masi, P. Bordalo, M.P. Bussa, A.A. Shishkin, G.V. Khaustov, Alan D. Martin, J. Heckmann, J. Franz, S. Wirth, Y. Bedfer, J. Hannappel, Paolo Pagano, Vladimir Peshekhonov, J. M. Le Goff, R. Birsa, N.I. Jouravlev, S. Horikawa, P.D. Eversheim, G. Piragino, V. Duic, W. Meyer, Maria Liz Crespo, M.E. Ladygin, A.A. Nozdrin, C. Heß, M. Giorgi, V. Frolov, V.N. Kolosov, F. Stinzing, N.A. Koutchinski, R. Kuhn, D. Kang, K. Königsmann, Christian Schill, A. Padee, O. Nähle, R. Bertini, A.B. Sadovski, R. Hermann, Andrea Ferrero, A. Maggiora, V.A. Dorofeev, L. Dhara, M. Slunecka, B. Badelek, W. Wiślicki, B. Gobbo, A.S. Korentchenko, A.M. Dinkelbach, B. Ketzer, A. Teufel, Oleg V. Ivanov, M. von Hodenberg, F. Kunne, A.A. Popov, N.V. Vlassov, Günter Baum, O.Yu. Shevchenko, V.I. Nikolaenko, R. Garfagnini, M. Finger, V.V. Tchalishev, S. Costa, J.H. Koivuniemi, and S. Panebianco
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, media_common.quotation_subject, Structure function, Zero (complex analysis), 01 natural sciences, Asymmetry, Nuclear physics, Deuterium, 0103 physical sciences, COMPASS experiment, 010306 general physics, Spin-½, media_common
Abstract: We present a precise measurement of the deuteron longitudinal spin asymmetry A 1 d and of the deuteron spin-dependent structure function g 1 d at Q 2 1 ( GeV / c ) 2 and 4 × 10 −5 x 2.5 × 10 −2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A 1 d and g 1 d are found to be consistent with zero in the whole range of x.
Published: 2007
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