Author: "Nour Makke" - Searchworks@Jio Institute Digital Library Search Results

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

9. 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

10. 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

11. Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Author: C. Quintans, I.A. Savin, I. Konorov, M. Quaresma, A. Vidon, B. Marianski, Bakur Parsamyan, F. Tosello, M. Jandek, Anne-Laure Martin, Andres Cicuttin, A. Moretti, Valery E. Lyubovitskij, Andrea Ferrero, Norihiro Doshita, N. d'Hose, V.D. Samoylenko, W.-D. Nowak, H. Schmieden, J.M. Friedrich, V.F. Konstantinov, S. Huber, E. Zemlyanichkina, A. Gridin, C. Naim, F. Gautheron, M. A. Faessler, L. Dhara, B. Badelek, A. Maggiora, G. Nukazuka, B. Ketzer, Jen-Chieh Peng, B.M. Veit, A. Rychter, S. Wallner, S. Ishimoto, H. Fischer, V.N. Kolosov, S. Dalla Torre, R.P. Kurjata, S. V. Donskov, M. Pešek, A. Magnon, S.S. Dasgupta, S. Ramos, D.V. Peshekhonov, K. Zaremba, V.A. Polyakov, G.V. Meshcheryakov, Yu. V. Mikhailov, Adam Szabelski, A.G. Olshevsky, G. Sbrizzai, A.S. Nunes, S. Gerassimov, D. Panzieri, Janusz Marzec, N. Horikawa, D.I. Ryabchikov, A. Srnka, Z. Kral, G. D. Alexeev, W. Dünnweber, A. Amoroso, R. Longo, C.-Y. Hsieh, S. Platchkov, P. Zavada, G. Hamar, N. du Fresne von Hohenesche, Yu. Kisselev, A. Kveton, M. Stolarski, J. Lichtenstadt, M. Büchele, W. Augustyniak, Maria Liz Crespo, R. Heitz, V. Frolov, Soumen Paul, M. Chiosso, I. Gnesi, J.H. Koivuniemi, K. Juraskova, M. V. Zavertyaev, M. Ostrick, A. Nagaytsev, F. Balestra, V. Jary, M. Pešková, O.Yu. Denisov, T. Szameitat, N. Pierre, Miroslav Sulc, P. Sznajder, S. Tessaro, D. Hahne, M. Wilfert, D. Neyret, Jan Tomsa, W. Meyer, J.F.C.A. Veloso, O.P. Gavrichtchouk, Martin Bodlak, D. Steffen, L. Sinha, R.R. Dusaev, A.V. Efremov, E. Mitrofanov, Mikhail Mikhasenko, V. Tskhay, Alexandr Selyunin, T. Matsuda, F. Tessarotto, Laura Gonzalez Silva, K. Kurek, M. Wagner, Nour Makke, A. Thiel, W. C. Chang, Yakov Petrovich Kulinich, R. Beck, A. Kerbizi, M. Krämer, F. Krinner, M. Grosse Perdekamp, O.M. Kouznetsov, Andrew Ivanov, C. Riedl, S. Sarkar, B. Grube, M.G. Alexeev, Yu.A. Khokhlov, Franco Bradamante, A. Grasso, S. Uhl, P. Bordalo, Alessandro Bressan, D. von Harrach, J. Giarra, Johannes Bernhard, Ch. Dreisbach, A. Guskov, A. Antoshkin, V. Anosov, Frank Klein, C. Regali, Arseniy Rybnikov, Kamil Augsten, Aram Kotzinian, S.A. Mamon, Markus Ball, Y.-S. Lian, M. Meyer, A.G. Chumakov, F. Kunne, K. Kondo Horikawa, B.I. Vasilishin, Z.V. Kroumchtein, F. Kaspar, J. Pretz, J. Pochodzalla, P. Jörg, S. Levorato, V.E. Burtsev, N. Mitrofanov, Naomi C R Makins, M. Finger, V. Andrieux, Y. Bedfer, C. Chatterjee, M. Virius, J. Smolik, O. Subrt, Y. Miyachi, Yuxiang Zhao, A. Sandacz, C. Franco, S. Dasgupta, F. Pereira, Nikolay Anfimov, R. Joosten, J. Barth, Gerhard K. Mallot, E. Fuchey, Jan Matousek, G. Reicherz, M. Ziembicki, M. Slunecka, J. Nový, S.-U. Chung, François Herrmann, P.-J. Lin, G.V. Khaustov, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, A. Vauth, T. Iwata, M. Gorzellik, E. M. Kabuß, Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., 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., 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., 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., Jandek, M., Jary, V., Joosten, R., Jorg, P., Juraskova, K., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo Horikawa, 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., Kveton, A., 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., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Naim, C., Nagaytsev, A., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesek, M., Peshekhonov, D. V., Peskova, M., 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., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmieden, H., Selyunin, A., Silva, L., Sinha, L., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., 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., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M., 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: Quantum chromodynamics, Muoproduction, Hard exclusive meson production, Generalised Parton Distributions, COMPASS, Photon, generalized parton distribution, Proton, Parton, measured [cross section], 01 natural sciences, Generalised Parton Distribution, Photon polarization, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Physics, Range (particle radiation), Large Hadron Collider, lcsh:QC1-999, ddc, angular dependence, beam [muon], polarization [photon], Nuclear and High Energy Physics, exclusive reaction, liquid: target [hydrogen], transverse [polarization], polarization: longitudinal, interference, Context (language use), leptoproduction [pi0], Nuclear physics, pi0: leptoproduction, hydrogen: liquid: target, 0103 physical sciences, polarization: transverse, ddc:530, 010306 general physics, longitudinal [polarization], 010308 nuclear & particles physics, muon: beam, cross section: measured, photon: polarization, High Energy Physics::Experiment, lcsh:Physics, experimental results
Abstract: Physics letters / B B805, 135454 (2020). doi:10.1016/j.physletb.2020.135454, Published by North-Holland Publ., Amsterdam
Published: 2020

12. 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

13. Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Author: F. Tosello, Andrea Ferrero, Jen-Chieh Peng, Norihiro Doshita, N. d'Hose, W.-D. Nowak, S. Ramos, S.S. Dasgupta, J. Smolik, Valery E. Lyubovitskij, Nikolay Anfimov, R. Joosten, O. Subrt, A. Koval, B. Ventura, J.F.C.A. Veloso, M. Mikhasenko, R.R. Dusaev, V. Tskhay, G.V. Meshcheryakov, B. Grube, H. Pekeler, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, Anne-Laure Martin, A. Srnka, Yu. V. Mikhailov, F. Tessarotto, K. Kondo Horikawa, G. Mattson, A.B. Ivanov, Alexandr Selyunin, M. Virius, Y. Miyachi, Yuxiang Zhao, Frank Klein, J. Lichtenstadt, M. Quaresma, O.M. Kouznetsov, O.Yu. Denisov, F. Gautheron, C. Chatterjee, K. Zaremba, P.M.M. Correia, V. Andrieux, Y. Bedfer, Markus Ball, Nour Makke, I. Konorov, S. Sarkar, V. Anosov, V.F. Konstantinov, W. C. Chang, M. V. Zavertyaev, V.A. Polyakov, Alessandro Bressan, D. Neyret, A. Sandacz, C. Franco, P. Jörg, G. Sbrizzai, B.M. Veit, S. Wallner, D. von Harrach, F. Kunne, Adam Szabelski, J. Agarwala, Miroslav Sulc, M. Meyer, Z. Kral, S. Levorato, A.G. Chumakov, A. Amoroso, A. Vauth, D.I. Ryabchikov, A. Magnon, C.-Y. Hsieh, V.E. Burtsev, O.P. Gavrichtchouk, S. Ishimoto, Martin Bodlak, L. Sinha, T. Matsuda, W. Augustyniak, H. Fischer, V. Frolov, Soumen Paul, N. Mitrofanov, R. Beck, T. Rudnicki, R.P. Kurjata, A. Kerbizi, Naomi C R Makins, A. Grasso, A. Townsend, M. Büchele, A.G. Olshevsky, K. Lavickova, J. Pretz, R. Longo, D.V. Peshekhonov, A. Nagaytsev, F. Balestra, M. Finger, M. Wilfert, T. Iwata, S. Platchkov, P. Zavada, N. Pierre, Jan Matousek, G. Reicherz, J.H. Koivuniemi, M. Grosse Perdekamp, Maria Liz Crespo, Yakov Petrovich Kulinich, F. Pereira, Y.-S. Lian, M. Gorzellik, S.-U. Chung, A. Antoshkin, P. Sznajder, S. V. Donskov, M. Pešek, V. Jary, A. Gridin, M. Stolarski, J. Nový, M.G. Alexeev, M. A. Faessler, S. Uhl, François Herrmann, P.-J. Lin, J. Giarra, Kamil Augsten, M. Pešková, I. Gnesi, A.S. Nunes, D. Panzieri, Janusz Marzec, J. Berenguer Antequera, Arseniy Rybnikov, M. Ziembicki, D. Steffen, Jan Tomsa, Franco Bradamante, Yu. Kisselev, E. M. Kabuß, A.V. Efremov, C. Riedl, P. Bordalo, Johannes Bernhard, Ch. Dreisbach, A. Guskov, C. Quintans, A. Maggiora, A. Thiel, I.A. Savin, M. Ostrick, G. D. Alexeev, G.V. Khaustov, W. Dünnweber, M. Slunečka, A. Kveton, R. Heitz, Andres Cicuttin, A. Moretti, V.D. Samoylenko, M. Jandek, S.A. Mamon, A. Maltsev, I. Denisenko, S. Dalla Torre, G. Nukazuka, M. Chiosso, J. Pochodzalla, M. Zemko, F. Kaspar, W. Meyer, K. Kurek, A. Vidon, B. Marianski, Bakur Parsamyan, S. Gerassimov, N. Horikawa, S. Tessaro, M. Wagner, F. Krinner, Yu.A. Khokhlov, Aram Kotzinian, B.I. Vasilishin, J. Barth, S. Dasgupta, E. Mitrofanov, Gerhard K. Mallot, D. D'Ago, C. Naim, L. Dhara, B. Badelek, B. Ketzer, H. Schmieden, J.M. Friedrich, S. Huber, E. Zemlyanichkina, A. Rychter, V.N. Kolosov, Agarwala, J., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Berenguer Antequera, J., Bernhard, J., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., 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., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisenko, I., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C., Dunnweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., 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., Grosse Perdekamp, M., 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., Joosten, R., Jorg, P., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo Horikawa, K., 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., Matousek, J., Matsuda, T., Mattson, G., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Novy, 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., Pereira, F., Pesek, M., Peshekhonov, D. V., Peskova, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., 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., Szabelski, A., 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., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M., 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: HERMES experiment, virtual [photon], Hadron, leptoproduction [hadron], measurement methods, Nuclear Theory, Virtual particle, HERMES, 01 natural sciences, SIDIS, COMPASS, hadron: leptoproduction, High Energy Physics - Experiment, azimthal asymmetrie, production [diffraction], High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), semi-inclusive reaction [deep inelastic scattering], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], COMPASS experiment, Nuclear Experiment, Physics, deep inelastic scattering: semi-inclusive reaction, nucleon, hep-ph, photon: energy, TMD obsvervable, angular dependence, High Energy Physics - Phenomenology, modulation, hadron: final state, TMD obsvervables, beam [muon], asymmetry [angular distribution], interpretation of experiments, deuteron: target, transverse momentum [quark], Nucleon, diffraction: production, Particle Physics - Experiment, Quark, Nuclear and High Energy Physics, Particle physics, azimthal asymmetries, exclusive reaction, angular distribution: asymmetry, Meson, FOS: Physical sciences, vector meson: production, 0103 physical sciences, kinematics: effect, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, final state [hadron], 010306 general physics, Particle Physics - Phenomenology, Muon, muon: beam, 010308 nuclear & particles physics, production [vector meson], hep-ex, energy [photon], CERN SPS, effect [kinematics], lcsh:QC770-798, quark: transverse momentum, High Energy Physics::Experiment, target [deuteron], photon: virtual
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 $^6$LiD target. In both cases, the amplitudes of the $\cos\phi_h$ and $\cos 2\phi_h$ 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 $\cos 2\phi_h$ modulation gives indication for a non-zero Boer-Mulders effect., Comment: 13 pages, 7 figures
Published: 2019

14. Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q2

Author: P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, Jen-Chieh Peng, V. Andrieux, Adam Szabelski, M. Wilfert, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, T. Matsuda, E.A. Levchenko, M.G. Alexeev, S. Uhl, J. Giarra, Michal Dziewiecki, R.P. Kurjata, Miroslav Sulc, Y.-S. Lian, V. Anosov, F. Tessarotto, M. Grosse Perdekamp, F. Giordano, Laura Gonzalez Silva, Johannes Bernhard, Ch. Dreisbach, E. M. Kabuß, A. Nagaytsev, F. Balestra, N. Pierre, A. Guskov, Andres Cicuttin, A. Moretti, Z.V. Kroumchtein, P. Jörg, A. Grasso, A. Srnka, C. Quintans, J.F.C.A. Veloso, Frank Klein, F. Kunne, G. D. Alexeev, I.A. Savin, M. Ziembicki, I. Orlov, S. Ramos, I. Konorov, W. Dünnweber, K. Königsmann, Valery E. Lyubovitskij, V.D. Samoylenko, Yakov Petrovich Kulinich, F. Gautheron, W.-D. Nowak, K. Schmidt, Andrea Ferrero, Norihiro Doshita, F. H. Heinsius, R. Heitz, K. Zaremba, O.M. Kouznetsov, L. Dhara, Markus Ball, G. Hamar, S. Levorato, V.E. Burtsev, N. Mitrofanov, B. Badelek, C. Regali, Yu. Kisselev, G.V. Khaustov, R. Salac, Nikolay Anfimov, N. d'Hose, O.Yu. Denisov, Z. Kral, Naomi C R Makins, V.A. Polyakov, A. Maggiora, S. Dalla Torre, S. Sarkar, B. Ketzer, A. Rychter, M. Ostrick, Arseniy Rybnikov, A. Vauth, J. Smolik, G.V. Meshcheryakov, G. Sbrizzai, R. Longo, E.R. Bielert, M. Büchele, V.N. Kolosov, R. Birsa, A. Amoroso, Yu. V. Mikhailov, K. Schönning, S. Sirtl, O. Subrt, M. Finger, W. Augustyniak, S. V. Donskov, M. Pešek, R. Joosten, N. du Fresne von Hohenesche, J. Lichtenstadt, R. Beck, J.H. Koivuniemi, Mikhail Mikhasenko, T. Iwata, E. Fuchey, A. Kerbizi, A.S. Nunes, S.S. Dasgupta, M. Quaresma, D.V. Peshekhonov, D. Panzieri, M. Gorzellik, L. Capozza, K. Kondo, F. Pereira, Y. Miyachi, A.A. Lednev, Janusz Marzec, E. Seder, D.I. Ryabchikov, K. Bicker, M. V. Zavertyaev, T. Grussenmeyer, M. Pešková, Jan Matousek, G. Reicherz, Celso Augusto Guimarães Santos, Franco Bradamante, Y. Bedfer, P. Sznajder, C. Riedl, J. Nový, D. Neyret, Jan Tomsa, H. Schmieden, C. Chatterjee, B. Grube, S.-U. Chung, J.M. Friedrich, A.V. Efremov, D. Steffen, A. Gridin, S. Huber, T. Szameitat, M. A. Faessler, A. Sandacz, M. Meyer, A.G. Chumakov, A. Thiel, C. Franco, François Herrmann, E. Zemlyanichkina, M. Krämer, P. Schiavon, M. Virius, P. Kremser, S.A. Mamon, Ilya Kuznetsov, M. Slunecka, A. Antoshkin, P. Bordalo, M. Aghasyan, H. Matsuda, J. Pochodzalla, F. Nerling, J. Pretz, A. Kveton, Kamil Augsten, S. Dasgupta, A. Austregesilo, T. Sawada, M. Stolarski, I. Gnesi, M. Chiosso, W. Meyer, K. Kurek, M. Tasevsky, E. Mitrofanov, Alexandr Selyunin, Nour Makke, W. C. Chang, Andrew Ivanov, Alessandro Bressan, D. von Harrach, S. Platchkov, P. Zavada, J. Barth, Maria Liz Crespo, Gerhard K. Mallot, V. Jary, T. Weisrock, S. Gerassimov, N. Horikawa, F. Tosello, S. Tessaro, D. Hahne, F. Krinner, Yu.A. Khokhlov, Aram Kotzinian, R. Windmolders, R.R. Dusaev, V. Tskhay, B.I. Vasilishin, J. ter Wolbeek, G. Nukazuka, A. Magnon, Anne-Laure Martin, V.F. Konstantinov, S. Wallner, S. Ishimoto, H. Fischer, N.S. Rogacheva, A. Vidon, B. Marianski, Bakur Parsamyan, A.G. Olshevsky, M. Levillain, C.-Y. Hsieh, V. Frolov, Soumen Paul, and I. J. Choi
Subjects: Physics, Nuclear and High Energy Physics, Muon, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Elementary particle, 01 natural sciences, Asymmetry, Baryon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton, media_common
Abstract: We present a precise measurement of the proton longitudinal double-spin asymmetry A 1 p and the proton spin-dependent structure function g 1 p at photon virtualities 0.006 ( GeV / c ) 2 Q 2 1 ( GeV / c ) 2 in the Bjorken x range of 4 × 10 − 5 x 4 × 10 − 2 . The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160 GeV and 200 GeV . The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x , the measured values of A 1 p and g 1 p are found to be positive. It is for the first time that spin effects are found at such low values of x .
Published: 2018

15. New analysis of ηπ tensor resonances measured at the COMPASS experiment

Author: L. Sinha, T. Matsuda, C. Quintans, A. Jackura, E.A. Levchenko, Andrew Ivanov, M.G. Alexeev, D. von Harrach, S. Uhl, J. Giarra, Michal Dziewiecki, Nikolay Anfimov, Franco Bradamante, M. Krämer, Jen-Chieh Peng, N. C. R. Makins, S.S. Dasgupta, W.-D. Nowak, Fabrice Gautheron, E. Fuchey, R. Joosten, P. Jörg, E. M. Kabuß, César Fernández-Ramírez, Jan Matousek, Aram Kotzinian, S.A. Mamon, M. A. Faessler, Adam P. Szczepaniak, M. Aghasyan, J. Pochodzalla, P. Bordalo, F. Kunne, A. Maggiora, A. Vauth, A. Antoshkin, M. Slunecka, Geoffrey C. Fox, R.R. Dusaev, V. Tskhay, W. Augustyniak, S. Ramos, S. Levorato, V.E. Burtsev, B.I. Vasilishin, V. Andrieux, Kamil Augsten, Adam Szabelski, N. I. Zhuravlev, M. Tasevsky, E. Mitrofanov, I.A. Savin, N. Mitrofanov, P. Sznajder, K. Kondo, P. Kremser, K. Schmidt, Andrea Ferrero, G.V. Meshcheryakov, J. Lichtenstadt, Sagari Sarkar, Yu. V. Mikhailov, O.Yu. Denisov, Z. Kral, P. Schiavon, M. Stolarski, D. Steffen, M. Gorzellik, Y. Bedfer, M. Büchele, J. ter Wolbeek, F. Giordano, C. Chatterjee, J. Nový, A. Kveton, S. Sirtl, S.-U. Chung, J.H. Koivuniemi, Jan Tomsa, A. Thiel, Norihiro Doshita, S. Platchkov, M. Grosse Perdekamp, E. Seder, P. Zavada, H. Matsuda, D. Neyret, R. Beck, A. Kerbizi, A. Nagaytsev, F. Balestra, N. Pierre, A. Grasso, A.V. Efremov, François Herrmann, Miroslav Sulc, Laura Silva, F. Tessarotto, M. Ziembicki, Celso Augusto Guimarães Santos, F. Pereira, G. Nukazuka, N. d'Hose, A. Magnon, J. Smolik, W. Meyer, Maria Liz Crespo, V. Jary, K. Zaremba, Yakov Petrovich Kulinich, S. Gerassimov, F. H. Heinsius, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, M. Pešková, Valery E. Lyubovitskij, S. V. Donskov, M. Pešek, R. Akhunzyanov, Takahiro Iwata, V.A. Polyakov, A.S. Nunes, M. Finger, S. Dalla Torre, N. Horikawa, D. Panzieri, Janusz Marzec, S. Dasgupta, A. Austregesilo, O. Subrt, G. Sbrizzai, G.V. Khaustov, F. Tosello, G. D. Alexeev, C. Riedl, T. Grussenmeyer, C. Regali, W. Dünnweber, I. Konorov, A. Amoroso, K. Bicker, V. Anosov, Yu. Kisselev, Johannes Bernhard, Ch. Dreisbach, A. Guskov, R. Salac, S. Tessaro, D. Hahne, P.D. Eversheim, N. du Fresne von Hohenesche, T. Schlüter, M. Ostrick, Andrea Bressan, T. Szameitat, Y. Miyachi, H. Suzuki, C.D.R. Azevedo, E.R. Bielert, A.G. Olshevsky, A.A. Lednev, R. Birsa, Jannes Nys, F. Krinner, R. Heitz, Yu.A. Khokhlov, M. Levillain, C.-Y. Hsieh, V. Frolov, J. Barth, Soumen Paul, Gerhard K. Mallot, A. Sandacz, T. Weisrock, I. J. Choi, Ilya Kuznetsov, F. Nerling, A. Srnka, K. Königsmann, M. V. Zavertyaev, H. Schmieden, J.M. Friedrich, S. Huber, E. Zemlyanichkina, Alessandro Pilloni, N.S. Rogacheva, Y.-S. Lian, A. Vidon, B. Marianski, Bakur Parsamyan, Z.V. Kroumchtein, L. Dhara, Anne-Laure Martin, G. Hamar, B. Badelek, V.F. Konstantinov, S. Wallner, S. Ishimoto, H. Fischer, B. Ketzer, A. Rychter, Frank Klein, R. Longo, V.N. Kolosov, K. Schönning, C. Franco, V. Pauk, Markus Ball, Yu. Ivanshin, D.I. Ryabchikov, J.F.C.A. Veloso, R.P. Kurjata, O.M. Kouznetsov, M. Virius, Mikhail Mikhasenko, B. Grube, Alexandr Selyunin, Nour Makke, W. C. Chang, M. Quaresma, D.V. Peshekhonov, I. Gnesi, M. Meyer, A.G. Chumakov, J. Pretz, T. Sawada, M. Chiosso, K. Kurek, Vincent Mathieu, Arseniy Rybnikov, M. Wilfert, O.P. Gavrichtchouk, Martin Bodlak, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, JPAC, 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, Jackura, A., Fernández-Ramírez, C., Mikhasenko, M., Pilloni, A., Mathieu, V., Nys, J., Pauk, V., Szczepaniak, A. P., Fox, G., 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., 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., 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. 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., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., 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, Yu., 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., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krämer, M., Kremser, P., 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., Matoušek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., 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., 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., 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., Schlüter, T., 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, 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., Veloso, J., Vidon, A., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: M012M3, 11.80.Et, COMPASS, 01 natural sciences, High Energy Physics - Experiment, UNITARITY, Subatomär fysik, Pomeron, Compass, excited state, Subatomic Physics, Nuclear and high energy physics, peripheral photoproduction, physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], COMPASS experiment, EXCHANGE, a2(1320), Nuclear Experiment, a2(1700), Quantum chromodynamics, Physics, Unitarity, PP INTERACTIONS, hep-ph, amplitude analysis, MESONS, lcsh:QC1-999, analytic properties, High Energy Physics - Phenomenology, Amplitude, S-matrix, Particle Physics - Experiment, AMPLITUDE ANALYSIS, Nuclear and High Energy Physics, Particle physics, Meson, CONNECTION, PHYSICS, 14.40.Be, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], pomeron, 0103 physical sciences, ddc:530, Tensor, 010306 general physics, M012W3, Particle Physics - Phenomenology, POMERON, hep-ex, 010308 nuclear & particles physics, M162M, 11.55.Bq, 11.55.Fv, meson resonance, M162W, Physics and Astronomy, 450 GEV/C, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, MATRIX, lcsh:Physics
Abstract: We present a new amplitude analysis of the $\eta\pi$ $D$-wave in $\pi^- p\to \eta\pi^- p$ 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 $a_2(1320)$ and the excited $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find $M=(1307 \pm 1 \pm 6)$~MeV and $\Gamma=(112 \pm 1 \pm 8)$~MeV, and for the excited state $a_2^\prime$ we obtain $M=(1720 \pm 10 \pm 60)$~MeV and $\Gamma=(280\pm 10 \pm 70)$~MeV, respectively., Comment: 15 pages, 6 figures
Published: 2018

16. Final COMPASS results on the deuteron spin-dependent structure functiong1dand the Bjorken sum rule

Author: K. Königsmann, Anne-Laure Martin, A. Maggiora, S. Takekawa, F. Pereira, T. Szameitat, R.P. Kurjata, M. Grosse Perdekamp, N.S. Rossiyskaya, F. Giordano, M. Roskot, Y. Miyachi, A.A. Lednev, Nikolay Anfimov, M. Meyer, Jen-Chieh Peng, A. Sandacz, V. Tskhay, Laura Silva, K. Zaremba, A. Vauth, V.A. Polyakov, M. Slunecka, V.F. Konstantinov, S. Wallner, A. Grasso, Yakov Petrovich Kulinich, R. Joosten, S. Gerassimov, Andrew Ivanov, N. Horikawa, M. Gorzellik, O.P. Gavrichtchouk, Martin Bodlak, S. Ishimoto, H. Fischer, N. I. Zhuravlev, K. Klimaszewski, D.V. Peshekhonov, G. Sbrizzai, P.D. Eversheim, F. Tosello, V. Anosov, S. Grabmüller, P. Jörg, K. Kondo, D. von Harrach, H. Suzuki, C.D.R. Azevedo, L. Sinha, T. Matsuda, J. Nový, S. Sarkar, V. Andrieux, A. Zink, Adam Szabelski, J. Pretz, A. Amoroso, S. Tessaro, A. Srnka, D. Hahne, S. Levorato, Y. Bedfer, Yu. Kisselev, R. Salac, S.-U. Chung, C. Chatterjee, F. Tessarotto, K. Bicker, B. Marianski, Andres Cicuttin, I. Orlov, N. Mitrofanov, M. Tasevsky, Bakur Parsamyan, F. Krinner, S. V. Donskov, M. Pešek, M. Aghasyan, V.D. Samoylenko, M. Ostrick, François Herrmann, I. Konorov, G. Reicherz, P. Kremser, E. Mitrofanov, I. Gnesi, J. Pochodzalla, A.S. Nunes, D.I. Ryabchikov, J. Vondra, E.R. Bielert, Yu.A. Khokhlov, D. Panzieri, Janusz Marzec, T. Sawada, P. Bordalo, S.S. Dasgupta, A.G. Olshevsky, T. Grussenmeyer, S. Dalla Torre, B. Badełek, C. Adolph, E. M. Kabuß, Naomi C R Makins, S. Platchkov, P. Zavada, A. Nagaytsev, F. Balestra, J.F.C.A. Veloso, M.G. Alexeev, M. Ziembicki, Markus Ball, M. Chiosso, S. Uhl, N. Pierre, M. V. Zavertyaev, I.A. Savin, Yu. Ivanshin, W. Meyer, Maria Liz Crespo, F. Thibaud, J. Giarra, Michal Dziewiecki, S. Dasgupta, A. Austregesilo, E. Fuchey, M. Finger, K. Kurek, F. H. Heinsius, W. Augustyniak, S. Ramos, Alexandr Selyunin, J. Barth, V. Jary, O.M. Kouznetsov, F. Haas, Jan Matousek, G. Nukazuka, G. Hamar, G.V. Khaustov, M. Büchele, Mikhail Mikhasenko, J.H. Koivuniemi, P. Sznajder, W.-D. Nowak, A. Magnon, W. Eyrich, Gerhard K. Mallot, Nour Makke, C. Riedl, V. Duic, Arseniy Rybnikov, D. Steffen, A.V. Efremov, B. Grube, M. Stolarski, W. C. Chang, A. Lehmann, Takahiro Iwata, M. Virius, A. Thiel, Q. Curiel, F. Klein, Miroslav Sulc, Johannes Bernhard, Ch. Dreisbach, A. Guskov, G.V. Meshcheryakov, M. Quaresma, Andrea Bressan, Yu. V. Mikhailov, S. Sirtl, M. Levillain, T. Weisrock, C.-Y. Hsieh, V. Frolov, Soumen Paul, Y.-S. Lian, I. J. Choi, Aram Kotzinian, R. Windmolders, Z.V. Kroumchtein, N. du Fresne von Hohenesche, J. ter Wolbeek, F. Kunne, C. Regali, E. Seder, Celso Augusto Guimarães Santos, Fabrice Gautheron, M. A. Faessler, A. Rychter, R. Longo, V.N. Kolosov, O.Yu. Denisov, K. Schönning, R. Beck, A. Kerbizi, R. Akhunzyanov, C. Franco, G. D. Alexeev, W. Dünnweber, H. Schmieden, J.M. Friedrich, R. Heitz, K. Schmidt, Andrea Ferrero, Norihiro Doshita, N. d'Hose, J. Smolik, O. Subrt, M. Krämer, S. Huber, F. Nerling, Kamil Augsten, J. Lichtenstadt, E. Zemlyanichkina, D. Neyret, M. Wilfert, L. Dhara, C. Braun, R. Birsa, C. Quintans, B. Ketzer, Franco Bradamante, P. Schiavon, and H. Matsuda
Subjects: Physics, Quark, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Compass, 0103 physical sciences, Proton spin crisis, High Energy Physics::Experiment, Sum rule in quantum mechanics, 010306 general physics, Nucleon
Abstract: Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a 6 LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)2 4GeV/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

17. 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

18. The spin structure functiong1pof the proton and a test of the Bjorken sum rule

Author: N.S. Rossiyskaya, F. Giordano, F. Haas, A. Grasso, V. Anosov, A.G. Olshevsky, F. Tessarotto, Laura Silva, C. Riedl, S. Ramos, Fabrice Gautheron, Q. Curiel, D. Neyret, L. Capozza, K. Kondo, A. Srnka, P. Sznajder, R. Jahn, A. Lehmann, J. Pretz, V. Andrieux, K. Bicker, P.D. Eversheim, J. Lichtenstadt, Adam Szabelski, K. Klimaszewski, M. Büchele, Andres Cicuttin, H. Suzuki, I. Orlov, C.D.R. Azevedo, V.D. Samoylenko, G. Reicherz, S. Dalla Torre, O.Yu. Denisov, K. Zaremba, F. Kunne, J.H. Koivuniemi, W.-D. Nowak, P. Kremser, V.A. Polyakov, D.I. Ryabchikov, G. Sbrizzai, M. Levillain, E. M. Kabuß, A. Nagaytsev, Yu. Kisselev, V. Frolov, E. Burtin, A. Amoroso, V.F. Konstantinov, Takahiro Iwata, F. Balestra, M. Ostrick, Soumen Paul, R. Beck, S. Ishimoto, M. Stolarski, Jen-Chieh Peng, H. Fischer, E. Rocco, E.R. Bielert, R. Joosten, C. Adolph, R. Akhunzyanov, G. Baum, I.A. Savin, Andrea Ferrero, Miroslav Sulc, Bakur Parsamyan, F. Hinterberger, V. Tskhay, G. D. Alexeev, E. Fuchey, R.P. Kurjata, I. J. Choi, A.B. Ivanov, M. Boer, S. Dasgupta, A. Austregesilo, A.V. Efremov, O.P. Gavrichtchouk, F. Krinner, Martin Bodlak, M. Finger, L. Sinha, Aram Kotzinian, S. G. Gerassimov, T. Matsuda, Johannes Bernhard, Jan Matousek, A. Guskov, A. Zink, Frank Klein, Andrea Bressan, Alexandr Selyunin, R. Windmolders, M. Chiosso, A. Magnon, R. Birsa, M. Gorzellik, Yu. Ivanshin, M. Krämer, W. Meyer, Maria Liz Crespo, V.I. Nikolaenko, M.G. Alexeev, S. Uhl, S. Sarkar, G.V. Meshcheryakov, Michal Dziewiecki, K. Kurek, V. Jary, M. Ziembicki, Yu. V. Mikhailov, S. Sirtl, B. Grube, W. Eyrich, Nour Makke, F. H. Heinsius, W. C. Chang, Y. Bedfer, S.-U. Chung, D. von Harrach, S. V. Donskov, M. Pešek, A.S. Nunes, C.-Yu. Hsieh, François Herrmann, G.V. Khaustov, D. Panzieri, Janusz Marzec, I. Konorov, M. Quaresma, T. Grussenmeyer, D.V. Peshekhonov, M. Slunecka, T. Szameitat, Federica Sozzi, S. Schopferer, I. Gnesi, J. ter Wolbeek, Z.V. Kroumchtein, N. du Fresne von Hohenesche, F. Thibaud, J. Barth, Gerhard K. Mallot, T. Weisrock, N. Horikawa, F. Tosello, S. Tessaro, D. Hahne, P. Schiavon, Yu.A. Khokhlov, H. Matsuda, M. Wilfert, C. Quintans, O. Kouznetsov, Franco Bradamante, J.F.C.A. Veloso, V. Duic, Alan D. Martin, S.S. Dasgupta, M. V. Zavertyaev, H. Schmieden, R. Hashimoto, J.M. Friedrich, N. Kuchinski, J. Bisplinghoff, S. Huber, C. Marchand, E. Zemlyanichkina, C. Regali, A. Rychter, R. Longo, V.N. Kolosov, K. Schönning, K. Königsmann, S. Platchkov, F. Nerling, J. Novy, C. Franco, A. Maggiora, Celso Augusto Guimarães Santos, S. Grabmüller, K. Schmidt, Norihiro Doshita, N. d'Hose, J. Pochodzalla, P. Bordalo, T. Nagel, L. Dhara, C. Braun, Y. Miyachi, A.A. Lednev, T. Michigami, B. Badelek, A. Sandacz, B. Ketzer, S. Takekawa, F. Pereira, M. Virius, P. Jörg, O.Yu. Shevchenko, S. Levorato, M. Grosse-Perdekamp, and Naomi C R Makins
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, 010308 nuclear & particles physics, Deep inelastic scattering, 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Sum rule in quantum mechanics, 010306 general physics, Nucleon, Spin-½
Abstract: New results for the double spin asymmetry A(1)(p) and the proton longitudinal spin structure function g(1)(p) 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 g(1)(p)(x) by about a factor of two in the region x less than or similar to 0.02. A next-to-leading order QCD fit to the g(1) world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, Delta Sigma, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g(1)(p). The uncertainty of Delta Sigma 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 g(1)(NS) (x, Q(2)) yields as ratio of the axial and vector coupling constants vertical bar gA/gV vertical bar = 1.22 +/- 0.05 (stat.) +/- 0.10 (syst.), which validates the sum rule to an accuracy of about 9%.
Published: 2016

19. Odd and even partial waves ofηπ−andη′π−inπ−p→η(′)π−pat191GeV/c

Author: C. Regali, G.V. Khaustov, Aram Kotzinian, V. Anosov, E. Burtin, S.S. Dasgupta, Bohdan Zelinka, P. Jörg, Jindřich Matoušek, Yu.V. Mikhailov, Maria Liz Crespo, P. Jasinski, S. Goertz, Stephan M. Paul, Günter Baum, O.Yu. Shevchenko, S. Levorato, L. Wang, V. Jary, J. ter Wolbeek, P. Schiavon, J. Lichtenstadt, B. Grube, F. Thibaud, J. Barth, Gerhard K. Mallot, R. Jahn, Erwin Bielert, H. Matsuda, R. Geyer, M. Finger, S. Takekawa, M. Boer, A.A. Lednev, T. Weisrock, Subir Sarkar, Anatoli Vasilievich Efremov, I. Konorov, T. Iwata, D.I. Ryabchikov, A.S. Nunes, L. Steiger, F. Kunne, Laura Silva, D. Panzieri, Janusz Marzec, A. Magnon, F. Nerling, N. Horikawa, Suh-urk Chung, R. Panknin, Sergey Donskov, V.D. Samoylenko, T. Nagel, Asher Berlin, S. Tessaro, D. Hahne, W. Eyrich, Nour Makke, M. Büchele, J. Bieling, E. M. Kabuß, R.P. Kurjata, Oleg Yu Denisov, Elena Rocco, N.S. Rossiyskaya, J.H. Koivuniemi, S. Ramos, Miroslav Sulc, F. Hinterberger, M. Gorzellik, J. Pretz, Y. Miyachi, P.D. Eversheim, Yu.A. Khokhlov, Roland Windmolders, M. Wilfert, I.A. Savin, M. Levillain, A. Grasso, H. Suzuki, Johannes Bernhard, V. Frolov, A. Guskov, M. Quaresma, M. Virius, C. Quintans, T. Matsuda, Frank Klein, O.P. Gavrichtchouk, K. Bicker, Martin Bodlak, Vladimir A. Polyakov, Andrey Ivanov, L. Sinha, T. Michigami, S. Dasgupta, Krzysztof Kurek, Stefano Dalla Torre, S. Platchkov, Andrea Bressan, Anna D. Martin, Christian Höppner, Karin Schönning, H. Wollny, D.V. Peshekhonov, P. Sznajder, O. Kouznetsov, Franco Bradamante, Yu. Ivanshin, M. Chiosso, M. Ziembicki, A. Sandacz, V. Andrieux, Adam Szabelski, T. Szameitat, F. H. Heinsius, Matthias Schott, W. Meyer, Thomas Grussenmeyer, Markus F. Krämer, M.G. Alexeev, S. Uhl, Marcin Stolarski, A. Lehmann, Yu. Kisselev, I. Gnesi, A. Austregesilo, C. Elia, Michal Dziewiecki, K. Schmidt, Andrea Ferrero, F. Tessarotto, I. Uman, Sebastian Neubert, Norihiro Doshita, A. Nagaytsev, F. Balestra, Armin Zink, K. Klimaszewski, Josef Nový, N. d'Hose, Andres Cicuttin, I. Orlov, G. Reicherz, Bakur Parsamyan, Z.V. Kroumchtein, B. Gobbo, Federica Sozzi, S. Schopferer, Felix Herrmann, A.G. Olshevsky, W.-D. Nowak, Q. Curiel, D. Neyret, G.V. Meshcheryakov, S. Sirtl, R. Birsa, P. Bordalo, Florian Haas, V.F. Konstantinov, M. Ostrick, S. Ishimoto, H. Fischer, A. Maggiora, M. V. Zavertyaev, H. Schmieden, S. Grabmüller, J.M. Friedrich, N. Kuchinski, D. v. Harrach, J. Bisplinghoff, M. Slunečka, S. Huber, E. Zemlyanichkina, L. Capozza, K. Kondo, Y. Bedfer, J. Pochodzalla, R. Joosten, C. Braun, B. Badelek, K. Zaremba, G. Sbrizzai, A. Rychter, A. Amoroso, N. du Fresne von Hohenesche, T. Schlüter, C. Adolph, S. Sosio, K. Königsmann, R. Akhunzyanov, G. D. Alexeev, W. Dünnweber, Mic Finger, C. Franco, S. G. Gerassimov, Fabrice Gautheron, M. A. Faessler, Bernhard Franz Ketzer, R. Sulej, A. Srnka, V.N. Kolosov, Christian Schill, V. Duic, Reinhard Beck, R. Hashimoto, and C. Marchand
Subjects: Discrete mathematics, Domatic number, Czech, Physics, Nuclear and High Energy Physics, language, Graph, language.human_language, Bildung
Abstract: DFG [1102]; German Bundesministerium fur Bildung und Forschung; Czech Republic MEYS [ME492, LA242]; SAIL (CSR), Govt. of India; CERN-RFBR [08-02-91009, 12-02-91500]; Portuguese FCT - Fundacao para a Ciencia e Tecnologia [CERN/FP/109323/2009, CERN/FP/116376/2010, CERN/FP/123600/2011]; MEXT; JSPS [18002006, 20540299, 18540281]; Daiko Foundation; Yamada Foundation; DFG; EU [283286]; Israel Science Foundation; Polish NCN [DEC-2011/01/M/ST2/02350]
Published: 2015

20. 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

21. 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

22. 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

23. 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

24. 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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25. Novel MPGD based Detectors of Single Photons in COMPASS RICH-1

Author: Yuxiang Zhao, B. Gobbo, F. Tessarotto, M. Büchele, J.F.C.A. Veloso, R. Birsa, J. Novy, S. Dalla Torre, C. Chatterjee, Nour Makke, P. Ciliberti, G. Sbrizzai, Andrea Bressan, Celso Augusto Guimarães Santos, F. A. B. Pereira, Franco Bradamante, G. Hamar, M. Finger, D. Panzieri, A. Maggiora, C.D.R. Azevedo, François Herrmann, Alan D. Martin, M. Slunečka, O. Denisov, S. Schopferer, J. Agarwala M. Alexeev, G. Menon, L. Steiger, M. Gregori, Miroslav Sulc, M. Chiosso, K. Steiger, H. Fischer, S. Levorato, S. Dasgupta, Agarwalaa, J., Alexeev, M., Azevedo, C. D. R., Birsa, R., Bradamante, F., Bressan, A., Büchele, M., Chatterjee, C., Chiosso, M., Ciliberti, P., Dalla Torre, S., Dasgupta, S., Denisov, O., Fingerg, M., Fischer, M. Finger Jr. H., Gobbo, B., Gregori, M., Hamar, G., Herrmann, F., Levorato, S., Maggiora, A., Makke, N., Martin, A., Menon, G., Novy, J., Panzieri, D., Pereira, F. A. B., Santos, C. A., Sbrizzai, G., Schopferere, S., Slunecka, M., Steiger, K., Steiger, L., Sulc, M., Tessarotto, F., Veloso, J. F. C. A., and Zhao, Y. X.
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Photon, Physics::Instrumentation and Detectors, COMPASS, MPGD, Photon detectors, RICH, THGEM, Instrumentation, FOS: Physical sciences, Photon detector, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Innovative gas detectors [13], Compass, 0103 physical sciences, Detectors and Experimental Techniques, 010306 general physics, physics.ins-det, Cherenkov radiation, Nuclear and High Energy Physic, Physics, Large Hadron Collider, 010308 nuclear & particles physics, business.industry, hep-ex, Detector, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Upgrade, Gas electron multiplier, High Energy Physics::Experiment, business, Particle Physics - Experiment
Abstract: COMPASS is a fixed target experiment at CERN SPS aimed to study Hadron Structure and Spectroscopy. Hadron Identification in the momentum range between 3 and 55 GeV/c is provided by a large gaseous Ring Imaging Cherenkov Counter (RICH-1). To cope with the challenges imposed by the new physics program of COMPASS, RICH-1 have been upgraded by replacing four MWPCs based photon detectors with newly developed MPGD based photon detectors. The architecture of the novel detectors is a hybrid combination of two layers of THGEMs and a MicroMegas. The top of the first THGEM is coated with CsI acting as a reflective photo-cathode. The anode is segmented in pads capacitively coupled to the APV-25 based readout. The new hybrid detectors have been commissioned during 2016 COMPASS data taking and stably operated during 2017 run. In this paper all aspects of the novel photon detectors for COMPASS RICH-1 are discussed., 4 Pages, 8 Figures, Proceedings for conference NDIP2017
Published: 2017

26. 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

27. 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

28. 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

29. Recent results on hadron structure from COMPASS

Author: Nour Makke
Subjects: Physics, Nuclear physics, Quasielastic scattering, Particle physics, Compass, Hadron, Transverse momentum, Fragmentation function, High Energy Physics::Experiment, Inelastic scattering, Nuclear Experiment, Deep inelastic scattering, Inelastic neutron scattering
Abstract: A review of the most recent measurements of longitudinal and transverse momentum dependent distributions and fragmentation functions accessed in the inclusive and the semi-inclusive deep inelastic scattering from COMPASS is given.
Published: 2016

30. The COMPASS Setup for Physics with Hadron Beams

Author: O.P. Gavrichtchouk, Martin Bodlak, K. Schmidt, L. Sinha, T. Matsuda, A. Zink, Norihiro Doshita, S. Gerassimov, N. Horikawa, M.G. Alexeev, Yu. Kisselev, S. Uhl, S. Tessaro, D. Hahne, E. M. Kabuß, Michal Dziewiecki, M. Ostrick, L. Steiger, I.A. Savin, E.R. Bielert, S. Goertz, Yu.A. Khokhlov, Murray Moinester, M. L. Colantoni, C. Braun, B. Badelek, J. Pretz, F. Thibaud, P.D. Eversheim, J. Barth, B. Ketzer, J. Lichtenstadt, F. Tessarotto, C. Adolph, Gerhard K. Mallot, Ch. Höppner, A. Samartsev, M. Virius, Miroslav Sulc, F. Hinterberger, M. Gregori, S. Sarkar, M. Wilfert, Z.V. Kroumchtein, R. Panknin, W.-D. Nowak, B. Grube, H. Suzuki, S. Ramos, S. V. Donskov, T. Weisrock, P. Sznajder, A. Lehmann, R. Joosten, S.-U. Chung, N.S. Rossiyskaya, H. Schmieden, A.S. Nunes, D. von Harrach, S. Platchkov, J.M. Friedrich, N. Kuchinski, D. Panzieri, Janusz Marzec, L. Capozza, C. Quintans, Frank Klein, K. Kondo, R. Hashimoto, A. Srnka, J. Bisplinghoff, S. Grabmüller, T. Grussenmeyer, S. Takekawa, Aram Kotzinian, R. Windmolders, Y. Bedfer, A. Grasso, S. Huber, P. Bordalo, D. Durand, François Herrmann, D.I. Ryabchikov, D. Desforge, R. Kuhn, D.V. Peshekhonov, P. Jasinski, J. Novy, E. Zemlyanichkina, F. Nerling, C. Pires, A.V. Efremov, M. Boer, E. Burtin, V.F. Konstantinov, J. ter Wolbeek, H. Wollny, S. Neubert, T. Szameitat, T. Dafni, Ph. Abbon, K. Kurek, Yu. Ivanshin, V.N. Kolosov, K. Schönning, L. Gatignon, S. Sosio, M. Chiosso, S. Ishimoto, H. Fischer, A. Rychter, R. Birsa, C. Regali, G. Pesaro, F. Haas, R. Geyer, O.Yu. Denisov, M. Gorzellik, F. Kunne, Andrea Ferrero, N. d׳Hose, O.M. Kouznetsov, A. Giganon, M. Krämer, V.I. Nikolaenko, T. Nagel, P. Jörg, G. Menon, M. Ziembicki, I. Gnesi, V. Duic, V. Tskhay, J. Pochodzalla, Q. Curiel, A.M. Dinkelbach, Günter Baum, O.Yu. Shevchenko, S. Levorato, D. Neyret, Jan Matousek, Y. Miyachi, A.A. Lednev, Laura Silva, G. Terca, R.P. Kurjata, R. Beck, F. H. Heinsius, A. Berlin, G.V. Meshcheryakov, V. Andrieux, K. Zaremba, Yu. V. Mikhailov, S. Sirtl, Franco Bradamante, A. Austregesilo, Adam Szabelski, I. Konorov, J.-Y. Rousse, C. Elia, T. Michigami, G.V. Khaustov, P. Schiavon, M. Slunecka, V.A. Polyakov, A.B. Ivanov, V. Pesaro, S.S. Dasgupta, G. Sbrizzai, B. Gobbo, M. Levillain, V. Frolov, Soumen Paul, M. V. Zavertyaev, Q. Weitzel, A. Sandacz, W. Eyrich, A. Amoroso, Nour Makke, J. Bieling, K. Bicker, H. Matsuda, Fabrice Gautheron, N. du Fresne von Hohenesche, T. Schlüter, M. Finger, M. Quaresma, M. A. Faessler, Federica Sozzi, E. Rocco, Matthias Schott, S. Schopferer, M. Büchele, R. Sulej, C. Marchand, J.H. Koivuniemi, A. Nagaytsev, R. Akhunzyanov, F. Balestra, W. Meyer, Maria Liz Crespo, J-M. Reymond, G. D. Alexeev, W. Dünnweber, K. Königsmann, A.G. Olshevsky, A. Magnon, Yu. Alexandrov, V. Jary, Christian Schill, Bakur Parsamyan, A. Maggiora, Alan D. Martin, K. Klimaszewski, C. Franco, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, S. Dalla Torre, Takahiro Iwata, D. Cotte, Johannes Bernhard, A. Guskov, Andrea Bressan, V. Anosov, Marcin Stolarski, J. Marroncle, I. Uman, P. Ciliberti, L. Wang, S. Dasgupta, R. Jahn, Abbon, P., Adolph, C., Akhunzyanov, R., Alexandrov, Y. u., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G, Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Ciliberti, Piero, Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Cotte, D., Crespo, M. L., Curiel, Q., Dafni, T., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Desforge, D., Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, V., Dünnweber, W., Durand, D., Dziewiecki, M., Efremov, A., Elia, Carmine, 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., Gatignon, L., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giganon, A., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Gregori, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jörg, P., Joosten, R., 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., 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., Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Marroncle, J., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Menon, G., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Moinester, M. A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesaro, Giulia, Pesaro, V., Peshekhonov, D. V., Pires, C., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Reymond, J. M., Rocco, E., Rossiyskaya, N. S., Rousse, J. Y., Ryabchikov, D. I., Rychter, A., Samartsev, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, Terça, G., Wolbeek, J. Ter, Tessaro, S., Tessarotto, F., Thibaud, F., Tskhay, V., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Weitzel, Q., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), 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, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département d'Ingénierie des Systèmes (ex SIS) (DIS), COMPASS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Calorimetry, Data acquisition and reconstruction, Fixed target experiment for hadron spectroscopy, Front-end electronics, Micro Pattern detectors and Drift chambers, Monte-Carlo simulation, RICH, Instrumentation, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], acquisition and reconstruction, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), Compass, Hadron spectroscopy, 0103 physical sciences, Detectors and Experimental Techniques, 010306 general physics, Physics, Data, Large Hadron Collider, 010308 nuclear & particles physics, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Micro Pattern detectors, and Drift chambers, Gas electron multiplier, Physics::Accelerator Physics, High Energy Physics::Experiment, Particle Physics - Experiment, Beam (structure), Front-end electronic, Micro Pattern detectors and Drift chamber
Abstract: The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well as new or upgraded detectors. The hadron setup is able to operate at the high incident hadron flux available at CERN. It is characterised by large angular and momentum coverages, large and nearly flat acceptances, and good two and three-particle mass resolutions. In 2008 and 2009 it was successfully used with positive and negative hadron beams and with liquid hydrogen and solid nuclear targets. This article describes the new and upgraded detectors and auxiliary equipment, outlines the reconstruction procedures used, and summarises the general performance of the setup., Comment: 91 pages, 101 figures and 7 tables
Published: 2015

31. Transverse Momentum Effects in Unpolarised SIDIS at COMPASS

Author: Nour Makke
Subjects: Physics, Particle physics, Large Hadron Collider, QC1-999, Hadron, FOS: Physical sciences, Observable, Spin structure, High Energy Physics - Experiment, Transverse plane, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Compass, COMPASS experiment, High Energy Physics::Experiment, Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract: Unpolarised semi-inclusive DIS is receiving a growing interest as a powerful tool to access poorly known universal functions that play a key role in many processes, in particular in the study of the spin structure of the nucleon. These functions can be investigated through experimental observables such as hadron multiplicities in the collinear and transverse framework, the dihadron multiplicities, the azimuthal asymmetries and some others. New results on these observables by the COMPASS experiment at CERN will be shown and discussed., Transversity 2014 (7 pages, 5 figures)
Published: 2014

32. Measurement of radiative widths of a2(1320) and $ \pi_{2}$ (1670)

Author: M. Boer, A.A. Lednev, R. Panknin, A. Rychter, S. Sosio, C. Franco, P. Schiavon, H. Schmieden, J.M. Friedrich, N. Kuchinski, F. Nerling, François Herrmann, K. Zaremba, W. Eyrich, Nour Makke, N.S. Rossiyskaya, T. Schlueter, V.A. Polyakov, J. Bieling, T. Iwata, J. Bisplinghoff, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, N. Horikawa, G. Sbrizzai, A.G. Olshevsky, M. Quaresma, S. Huber, Vladimir Nikolaenko, E. Zemlyanichkina, Sergey Donskov, A. Bressan, T. Matsuda, Asher Berlin, M. Gorzellik, S. Tessaro, D. Hahne, Q. Curiel, A. Amoroso, M. Pešek, C. Braun, B. Badelek, B. Ketzer, A. Filin, S. Ramos, D. Neyret, H. Matsuda, A. Srnka, D.I. Ryabchikov, A. Grasso, A.S. Nunes, N. du Fresne von Hohenesche, Yu.V. Mikhailov, V. Anosov, Yu.A. Khokhlov, S. Dasgupta, Z.V. Kroumchtein, Frank Klein, M. Kraemer, V. Frolov, K. Schmidt, M. Ziembicki, P. Joerg, I. Gnesi, Anne-Laure Martin, D. Panzieri, Janusz Marzec, Andrew Ivanov, S. Neubert, B. Gobbo, P. Sznajder, Lei Wang, M. Virius, S. Sarkar, T. Guthoerl, S.S. Dasgupta, Aram Kotzinian, Norihiro Doshita, Federica Sozzi, C. Adolph, V. Andrieux, S. Schopferer, F. H. Heinsius, Matthias Schott, Alexander Schmidt, I.A. Savin, M. Wilfert, P. Bordalo, E. M. Kabuss, Laura Silva, N. d'Hose, E. Burtin, M. Slunečka, A. Lehmann, W.-D. Nowak, V.F. Konstantinov, D. von Harrach, P. Jasinski, Yu. Kisselev, S. Uhl, C. Quintans, Roland Windmolders, J. ter Wolbeek, H. Wollny, M.G. Alekseev, V.N. Kolosov, Adam Szabelski, Michal Dziewiecki, M. Ostrick, M. V. Zavertyaev, A. Austregesilo, Johannes Bernhard, C. Elia, A. Guskov, Jan Matousek, K. Schoenning, K. Klimaszewski, Yu. Ivanshin, Maxence Vandenbroucke, M. Finger~jr., G.V. Meshcheryakov, F. Thibaud, J. Barth, H. Fischer, K. Koenigsmann, Christian Schill, O.Yu. Shevchenko, S. Levorato, T. Nagel, Andres Cicuttin, I. Orlov, S. Grabmueller, K. Bicker, G. Reicherz, S. Goertz, P.D. Eversheim, O. Kouznetsov, S. Sirtl, H. Suzuki, Gerhard K. Mallot, A.V. Efremov, T. Szameitat, I. Konorov, Y. Miyachi, S. Dalla Torre, V.D. Samoylenko, J. Lichtenstadt, Franco Bradamante, Elena Rocco, F. Tessarotto, S. Ishimoto, Marcin Stolarski, T. Weisrock, T. Michigami, B. Grube, S. U. Chung, M. Finger, A. Magnon, J. Novy, C. Marchand, M. Chiosso, A. Sandacz, I. Uman, R.P. Kurjata, G.V. Khaustov, K. Kurek, S. Takekawa, G. Baum, L. Steiger, S. Platchkov, J.H. Koivuniemi, W. Meyer, Maria Liz Crespo, Miroslav Sulc, F. Hinterberger, Bakur Parsamyan, V. Jary, J. Pretz, J. Pochodzalla, Ch. Hoeppner, A. Maggiora, A. Nagaytsev, F. Balestra, R. Akhunzyanov, G. D. Alexeev, F. Haas, R. Geyer, S. G. Gerassimov, Fabrice Gautheron, M. A. Faessler, R. Sulej, O.Yu. Denisov, Z. Kral, F. Kunne, R. Beck, R. Birsa, S. Paul, R. Joosten, W. Duennweber, M. Buechele, L. Capozza, K. Kondo, R. Hashimoto, J. Vondra, Y. Bedfer, Andrea Ferrero, V. Duic, R. Jahn, Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Grube, B., Guskov, A., Guthörl, T., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D’Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jörg, P., Joosten, R., 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., Kral, Z., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, Stefano, Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Martin, Anna, Marzec, J., Matousek, J., Matsuda, H., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Orlov, I., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rychter, A., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Takekawa, Stefano, ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Matsuda, T., Lichtenstadt, J., Sznajder, P., and Ziembicki, M.
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Scattering, Momentum transfer, Mathematics::Analysis of PDEs, Primakoff scattering, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Pion, Computer Science::Discrete Mathematics, pi2, Primakoff scattering, radiative width, a2, pi2, Radiative transfer, Coulomb, High Energy Physics::Experiment, Production (computer science), radiative width, Physics::Atomic Physics, Particle Physics - Experiment, a2
Abstract: The COMPASS Collaboration at CERN has investigated the reaction $\pi^- \gamma \rightarrow \pi^-\pi^-\pi^+$ embedded in the Primakoff reaction of $190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $\pi^- \text{Pb} \rightarrow \pi^-\pi^-\pi^+ \text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\text{GeV}/c)^2$. Using a partial-wave analysis the amplitudes and relative phases of the $a_2(1320)$ and $\pi_2(1670)$ mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the $a_2(1320)$ to be $\Gamma_0(a_2(1320) \rightarrow \pi\gamma) = (358 \pm 6_{\textrm{stat}} \pm 42_{\textrm{syst}})~\textrm{keV}$. As the first measurement, $\Gamma_0(\pi_2(1670) \rightarrow \pi\gamma) = (181 \pm 11_{\textrm{stat}} \pm 27_{\textrm{syst}})~\textrm{keV} \cdot (\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}/\textrm{BR}_{f_2 \pi})$ is obtained for the radiative width of the $\pi_2(1670)$, where in this analysis the branching ratio $\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}=0.56$ has been used. We compare these values to previous measurements and theoretical predictions., Comment: 27 pages, 12 figures and 3 tables
Published: 2014

33. Fragmentation Functions measurement at COMPASS

Author: Nour Makke
Subjects: Physics, Quark, Quantum chromodynamics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Fragmentation (computing), FOS: Physical sciences, Nucleon spin structure, Parton, High Energy Physics - Experiment, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract: Fragmentation functions represent a key ingredient to address the proton spin structure in semi-inclusive deep-inelastic scattering and proton-proton collisions. They can not be determined from perturbative Quantum Chromodynamics and have to be extracted from experimental data in different processes. The COMPASS experiment at CERN provides a large data sample and covers a wide kinematic range for precise measurement of hadron multiplicities, directly connected to fragmentation functions. Recent, full-differential results on pion and kaon multiplicities are presented and discussed, Comment: 8 pages, 5 figures, XXI International Workshop on Deep-Inelastic Scattering and Related Subjects - DIS2013, April 22-26 2013, Marseille, France
Published: 2013

34. Measurement of the cross section for high-pThadron production in the scattering of160−GeV/cmuons off nucleons

Author: S. Grabmüller, A. Srnka, Michael Kramer, J. Pochodzalla, Ch. Höppner, P.D. Eversheim, J.H. Koivuniemi, M. V. Zavertyaev, C. Marchand, T. Negrini, V. Frolov, K. Schmidt, J.M. Friedrich, V. Rapatsky, Andrea Ferrero, P. Schiavon, Achim Richter, Norihiro Doshita, N. d'Hose, J. Bisplinghoff, S. Koblitz, C. Adolph, R. Jahn, L. Schmitt, I. Uman, S. Takekawa, Oleg V. Ivanov, Miroslav Sulc, F. Hinterberger, D. Kang, K. Königsmann, L. Lauser, A. Maggiora, S. Ramos, François Herrmann, Vladimir Nikolaenko, A. N. Sissakian, A.G. Olshevsky, L. Steiger, A. Padee, G.V. Khaustov, E. Zemlyanichkina, A. Bressan, W. Schröder, O.P. Gavrichtchouk, N. Horikawa, T. Nagel, Yu.V. Mikhailov, L. Sinha, T. Matsuda, N.V. Vlassov, S.S. Dasgupta, R. Gushterski, A.A. Lednev, W. Meyer, Maria Liz Crespo, I.A. Savin, Sergey Donskov, K. Schönning, Alexey Antonov, M. Slunečka, Günter Baum, O.Yu. Shevchenko, S. Levorato, T. Michigami, T. Guthörl, P. Sznajder, D. Neyret, A. Lehmann, A. Mutter, E. M. Kabuss, A. Bravar, S. Sosio, S. Paul, S. Neubert, V. Jary, B. Gobbo, S. Tessaro, A. Mann, Yu. Kisselev, R. Garfagnini, Marcin Stolarski, M. Finger, S. Uhl, N. I. Zhuravlev, M.G. Alekseev, A. Sandacz, F. Nerling, Marcello Giorgi, Federica Sozzi, M. Ziembicki, A.V. Efremov, E. Rondio, Moinester, Michal Dziewiecki, K. Klimaszewski, A. Morreale, S. Schopferer, M. Ostrick, V.D. Samoylenko, Elena Rocco, Lei Wang, M. Virius, Andres Cicuttin, Yu.A. Khokhlov, J. Polak, S. Platchkov, V.N. Kolosov, G. Reicherz, C. Franco, R. Panknin, Anne-Laure Martin, Laura Silva, N.S. Rossiyskaya, F. Haas, Christian Schill, K. Zaremba, G.I. Smirnov, S. Dalla Torre, C. Hess, F. H. Heinsius, J. Pretz, G. Piragino, S. Sarkar, R. Geyer, V.A. Polyakov, A. Grasso, P. Bordalo, C. Quintans, E. Perevalova, Jean-Francois Rajotte, J. Barth, A. Zvyagin, D.I. Ryabchikov, I. Konorov, V. Duic, E. Burtin, V.F. Konstantinov, A.S. Nunes, D. von Harrach, D. Panzieri, A. Austregesilo, G. Sbrizzai, W. Wislicki, Janusz Marzec, S. Dasgupta, C. Elia, Gerhard K. Mallot, T. Liška, L. G. Tkatchev, H. Fischer, A. Amoroso, Maxence Vandenbroucke, R. Joosten, N. du Fresne von Hohenesche, Yu. Alexandrov, S. Ishimoto, T. Schlüter, A. Magnon, Bakur Parsamyan, R. Birsa, R. Kuhn, Roland Windmolders, K. Bicker, A. Korzenev, K. Kondo, L. Dhara, S. Das, C. Braun, M. Chiosso, R. Bertini, T. Iwata, Y. Bedfer, Johannes Bernhard, A. Guskov, B. Badelek, S. U. Chung, K. Kurek, M. Bettinelli, O. Kouznetsov, A. Nagaytsev, F. Balestra, Aram Kotzinian, B. Ketzer, Franco Bradamante, A. Filin, M.G. Sapozhnikov, D.V. Peshekhonov, P. Jasinski, G. Pesaro, J. ter Wolbeek, I. Gnesi, W. Eyrich, Nour Makke, J. Bieling, M. Quaresma, W.-D. Nowak, G.V. Meshcheryakov, Matthias Schott, F. Tessarotto, Z.V. Kroumchtein, O.Yu. Denisov, F. Kunne, G. D. Alexeev, W. Dünnweber, S. G. Gerassimov, Fabrice Gautheron, M. A. Faessler, V.Yu. Alexakhin, R. Sulej, Frank Klein, H. Wollny, Yu. Ivanshin, S. Goertz, J. Lichtenstadt, and B. Grube
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, 010308 nuclear & particles physics, Scattering, Nuclear Theory, Hadron, 01 natural sciences, Nuclear physics, Cross section (physics), 0103 physical sciences, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The cross section for production of charged hadrons with high transversemomenta in scattering of 160 GeV/c muons off nucleons at low photonvirtualities has been measured at the COMPASS experiment at CERN. The results,which cover transverse momenta from 1.1 to 3.6 GeV/c, are compared to anext-to-leading order perturbative Quantum Chromodynamics (NLO pQCD)calculation in order to evaluate the applicability of pQCD to this process inthe kinematic domain of the experiment. The shape of the calculateddifferential cross section as a function of transverse momentum is found to bein good agreement with the experimental data, but the normalization isunderestimated by NLO pQCD. This discrepancy may point towards the relevance ofterms beyond NLO in the pQCD framework. The dependence of the cross section onthe pseudo-rapidity and on the charge of the hadrons is also discussed.
Published: 2013

35. Study of the hadronisation process from single hadron and hadron-pair production in SIDIS at COMPASS

Author: Nour Makke
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, Hadron, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Inelastic scattering, Deep inelastic scattering, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, Pair production, High Energy Physics - Phenomenology (hep-ph), Compass, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: Hadron production in hard scattering reactions is described by the hadronization mechanism which combines quarks into final-state hadrons. Within the theoretical framework of leading-twist collinear QCD, the cross section for hadron production in semi-inclusive deep-inelastic scattering can be factorized into a hard scattering cross section describing the hard interaction at the quark level calculable in perturbative QED, and non-perturbative universal functions: parton distribution functions which reflect the quark structure of initial-state hadrons and collinear fragmentation functions which encode details on the hadronization process. In the last decades, a major effort has been achieved on theoretical and experimental levels and allowed to constraint, with very high precision, parton distribution functions except strange quark distribution, which still carries large uncertainties. Fragmentation functions, however, remain at a very preliminary stage of study with a growing interest in a more accurate and precise knowledge. Nowadays, while pion fragmentation functions are known with a limited precision and kaon fragmentation functions are poorly known, the situation for dihadron fragmentation functions turns out to be behind the schedule and no studies or measurements have been yet performed.Measuring both single hadron and hadron pair multiplicities in semi-inclusive deep inelastic scattering at COMPASS represent a fundamental contribution towards a better understanding of the hadronization process and a first measurement for hadron pair multiplicities in SIDIS. These measurements will be presented and discussed., 4 pages, 5 figures, contribution given at the 20th International Symposium on Spin Physics (SPIN2012) JINR, Dubna, Russia, September 17 - 22, 2012. To be published in "Physics of Elementary Particles and Atomic Nuclei" review journal
Published: 2013

36. Performance of large pixelised Micromegas detectors in the COMPASS environment

Author: C Coquelet, M. Vandenbroucke, S Platchkov, F Thibaud, E. Burtin, Y. Bedfer, K Dupraz, L Capozza, Ph. Abbon, D. Desforge, R. Durand, A. Giganon, Nour Makke, A. Magnon, Q. Curiel, D. Neyret, B. Paul, C. Marchand, N d'Hose, Andrea Ferrero, M Usseglio, V Andrieux, M Anfreville, D Jourde, F. Kunne, 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, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: Physics, Large Hadron Collider, Spectrometer, 010308 nuclear & particles physics, business.industry, Physics::Instrumentation and Detectors, Detector, MicroMegas detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Optics, Compass, 0103 physical sciences, Gas electron multiplier, COMPASS experiment, 010306 general physics, business, Instrumentation, Mathematical Physics, Beam (structure)
Abstract: International audience; New large-size Micromegas detectors are being developed for the future physics programof the COMPASS experiment at CERN. These detectors will have a pixelised readout in theircenter to detect particles in the beam region, where the particle flux can reach several MHz/cm2 innominal conditions, and will have to handle high intensity hadron beams (up to a few 107 hadrons/s)with a discharge rate lower than 0.01 to 0.001 discharge/s. Several prototypes with two differentdischarge rate reduction technologies (preamplification stage with a GEM foil and resistive readoutwith buried resistors) have been studied in the COMPASS beam since 2010. Four of themhave been included in the spectrometer since 2012, and have been used for the track reconstruction.Their performance (detection efficiency, space and time resolutions, and discharge rates) fordifferent beam intensities and magnetic fields environments are presented. These detectors playan important role in the track reconstruction at very small angle; their impact is presented, with aparticular emphasis on the effect of the background reduction due to an improved cluster selection.
Published: 2013

37. Transverse Momentum Dependent Hadron Multiplicities at COMPASS

Author: Nour Makke
Subjects: Nuclear physics, Physics, Particle physics, Large Hadron Collider, Compass, Hadron, COMPASS experiment, Parton, Observable, Nuclear Experiment, Deep inelastic scattering, Nucleon
Abstract: Unpolarised semi-inclusive deep inelastic scattering is receiving a growing interest as a powerful tool to access poorly known transverse momentum dependent parton distributions and fragmentation functions that play a key role in many processes, in particular in the study of the spin structure of the nucleon. These functions can be investigated through experimental observables. New results on these observables by the COMPASS experiment at CERN will be shown and discussed.
Published: 2016

38. Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries

Author: R. Windmolders, S.U. Chung, L. Schmitt, S. Takekawa, Oleg V. Ivanov, O.P. Gavrichtchouk, P. Jasinski, L. Sinha, T. Matsuda, J. ter Wolbeek, Yu. Alexandrov, G. Baum, Yu. Kisselev, J. Lichtenstadt, S.S. Dasgupta, S. Grabmüller, I. Uman, A. Zvyagin, A. Bressan, M. Ostrick, P.D. Eversheim, H. Suzuki, M.G. Sapozhnikov, E. Rondio, Laura Silva, Bakur Parsamyan, S. Gerassimov, M.G. Alekseev, R. Birsa, N. Horikawa, Sergey Donskov, K. Klimaszewski, A. Srnka, D.V. Peshekhonov, G. Piragino, S. Platchkov, Jean-Francois Rajotte, D.I. Ryabchikov, S. Paul, S. Tessaro, Fabrice Gautheron, Andres Cicuttin, A.S. Nunes, N.V. Vlassov, O.Yu. Shevchenko, S. Levorato, M. A. Faessler, A.G. Olshevsky, J. Pochodzalla, L. Steiger, A. Padee, V. Frolov, K. Zaremba, R. Panknin, G. Pesaro, G. Reicherz, D. Panzieri, S. Ramos, S. Uhl, M. Giorgi, K. Schönning, Alexey Antonov, V.Yu. Alexakhin, Yu.A. Khokhlov, P. Bordalo, D. Kang, N.S. Rossiyskaya, A. Bravar, G.I. Smirnov, S. Dalla Torre, T. Liška, V.A. Polyakov, K. Bicker, D. Neyret, A. Mutter, Michal Dziewiecki, S. Das, Michael Kramer, J. Barth, T. Nagel, J. Pretz, S. Sosio, A. Grasso, I. Gnesi, O.Yu. Denisov, François Herrmann, M. Bettinelli, R. Garfagnini, F. Kunne, R. Jahn, M. Finger, A. Morreale, P. Sznajder, I.A. Savin, Gerhard K. Mallot, G. Sbrizzai, K. Königsmann, C. Hess, S. Koblitz, V. Duic, J.H. Koivuniemi, J. Marzec, A. Korzenev, A.A. Lednev, Yu.V. Mikhailov, A. Lehmann, A. Amoroso, T. Michigami, L. G. Tkatchev, Lei Wang, M. Virius, Matthias Schott, V. Rapatsky, C. Franco, Z.V. Kroumchtein, A. Sandacz, S. Neubert, F. Nerling, A. Maggiora, Sarben Sarkar, A. Richter, F. Tessarotto, N. du Fresne von Hohenesche, E. M. Kabuss, T. Schlüter, E. Rocco, Anne-Laure Martin, J. Polak, M. Stolarski, V.N. Kolosov, Moinester, T. Negrini, I. Konorov, Johannes Bernhard, A. Guskov, W.-D. Nowak, A. Mann, K. Schmidt, T. Iwata, M. V. Zavertyaev, F.H. Heinsius, Christian Schill, W. Eyrich, J.M. Friedrich, Norihiro Doshita, E. Burtin, V.F. Konstantinov, Nour Makke, J. Bieling, C. Adolph, R. Sulej, L. Capozza, K. Kondo, N. d'Hose, J. Bisplinghoff, G. D. Alexeev, A. Nagaytsev, F. Balestra, W. Wislicki, W. Dünnweber, M. Quaresma, A. Magnon, Vladimir Nikolaenko, A. N. Sissakian, Y. Bedfer, Miroslav Sulc, C. Marchand, F. Hinterberger, M. Ziembicki, E. Zemlyanichkina, R. Gushterski, T. Guthörl, A.V. Efremov, Ch. Höppner, F. Haas, R. Geyer, S. Ishimoto, H. Fischer, A. Austregesilo, C. Elia, G.V. Meshcheryakov, L. Dhara, C. Braun, E. Perevalova, B. Badelek, M. Chiosso, R. Joosten, B. Ketzer, A. Filin, K. Kurek, R. Bertini, Andrea Ferrero, Frank Klein, L. Lauser, H. Wollny, Yu. Ivanshin, S. Goertz, B. Grube, M. Slunecka, B. Gobbo, W. Schröder, N. I. Zhuravlev, Federica Sozzi, S. Schopferer, M. Wilfert, C. Quintans, O. Kouznetsov, Franco Bradamante, P. Schiavon, G.V. Khaustov, W. Meyer, Maria Liz Crespo, V. Jary, D. von Harrach, Maxence Vandenbroucke, V.D. Samoylenko, Aram Kotzinian, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Laboratoire de Physique des Composants à Semiconducteurs (LPCS), École Nationale Supérieure d'Électronique et de Radioélectricité de Grenoble (ENSERG)-Centre National de la Recherche Scientifique (CNRS), 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, Università degli studi di Verona = University of Verona (UNIVR), Department of Mathematics [Philadelphia], University of Pennsylvania, National Taiwan University [Taiwan] (NTU), Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP), Laboratoire d'informatique Fondamentale de Marseille (LIF), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Department of Zoology, Visva-Bharati University, Université Antonine (UA), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Laboratoire sur le langage, le cerveau et la cognition (L2C2), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Archeobotanica e Paleoecologia, Università del Salento [Lecce], Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Institut für Ionenphysik und Angewandte Physik - Institute for Ion Physics and Applied Physics [Innsbruck], Leopold Franzens Universität Innsbruck - University of Innsbruck, Department of Environmental and Materials Engineering, Nagoya Institute, Institute for Computing and Information Sciences [Nijmegen] (ICIS), Radboud University [Nijmegen], Laboratory of Molecular Immunology, Rockefeller University [New York], University of Manchester [Manchester], Université de Caen Normandie (UNICAEN), Normandie Université (NU), Department of Otolaryngology - Head and Neck Surgery, Department of Medecine [Montréal], McGill University = Université McGill [Montréal, Canada]-McGill University = Université McGill [Montréal, Canada], Centre for Research on Brain, Language and Music, International Laboratory for Brain, Music and Sound Research (BRAMS), Princeton University, aucun, Symadrem, Analyse, Géométrie et Modélisation (AGM - UMR 8088), Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Franco-czech Laboratory for clinical research on obesity, Charles University [Prague] (CU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Environmental Physics [Bremen] (IUP), University of Bremen, University of Cambridge [UK] (CAM), National School of Mountain Sports/National Ski-Nordic Centre, Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de Mise en Forme des Matériaux (CEMEF), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Departamento de Matemática e Aplicações (DMA), Universidade do Minho = University of Minho [Braga], Imagerie et modélisation Vasculaires, Thoraciques et Cérébrales (MOTIVATE), Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), COMPASS, Luminescent Materials Laboratory, Department of Biotechnology, University of Verona, University of Pennsylvania [Philadelphia], Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Université Antonine, Université Antonine, Faculté d'ingénieurs, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Radboud university [Nijmegen], Institut National de la Santé et de la Recherche Médicale (INSERM)-Charles University [Prague] (CU), MINES ParisTech - École nationale supérieure des mines de Paris, Universidade do Minho, Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badelek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, DALLA TORRE, Silvia, S., Da, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Duennweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger j., R., H., Fischer, C., Franco, N., du Fresne von Hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmueller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthoerl, F., Haa, D., von Harrach, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoeppner, C. h., N., D'Hose, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, 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., Koenigsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Kraemer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlueter, K., Schmidt, L., Schmitt, K., Schoenning, S., Schopferer, M., Schott, W., Schroeder, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter Wolbeek, Tessaro, Susanna, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, M., Wilfert, R., Windmolder, W., Wislicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, COMPASS, SIDIS, spin asymmetries, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Compass, 0103 physical sciences, 010306 general physics, Nuclear Experiment, media_common, Physics, [PHYS]Physics [physics], Sivers asymmetries, Large Hadron Collider, ta114, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Deep inelastic scattering, Transverse plane, Distribution function, High Energy Physics::Experiment, COMPASS SIDIS TMD Sivers asymmetry, Particle Physics - Experiment
Abstract: The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003 0.03. The asymmetry is different from zero and positive also in the low x region, where sea-quarks dominate. The kinematic dependence of the asymmetry has also been investigated and results are given for various intervals of hadron and virtual photon fractional energy. In contrast to the case of the Collins asymmetry, the results on the Sivers asymmetry suggest a strong dependence on the four-momentum transfer to the nucleon, in agreement with the most recent calculations., Comment: 11 pages, 6 figures
Published: 2012

39. New pixelized Micromegas detector with low discharge rate for the COMPASS experiment

Author: Damien Neyret, A. Magnon, D. Desforge, N d'Hose, Ph. Abbon, M Anfreville, Bernard Paul, F. Kunne, D Jourde, Christophe Coquelet, M Usseglio, A. Giganon, F Thibaud, Nour Makke, M. Vandenbroucke, S Platchkov, Y. Bedfer, E. Burtin, Claude Marchand, 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, and Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP)
Subjects: Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Compass, 0103 physical sciences, COMPASS experiment, Detectors and Experimental Techniques, 010306 general physics, Instrumentation, Mathematical Physics, Physics, Resistive touchscreen, Large Hadron Collider, Spectrometer, 010308 nuclear & particles physics, business.industry, Detector, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Physics::Accelerator Physics, High Energy Physics::Experiment, business, Beam (structure)
Abstract: New Micromegas (Micro-mesh gaseous detectors) are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. Several major upgrades compared to present detectors are being studied: detectors standing five times higher luminosity with hadron beams, detection of beam particles (flux up to a few hundred of kHz/mm^{2}, 10 times larger than for the present Micromegas detectors) with pixelized read-out in the central part, light and integrated electronics, and improved robustness. Two solutions of reduction of discharge impact have been studied, with Micromegas detectors using resistive layers and using an additional GEM foil. Performance of such detectors has also been measured. A large size prototypes with nominal active area and pixelized read-out has been produced and installed at COMPASS in 2010. In 2011 prototypes featuring an additional GEM foil, as well as an resistive prototype, are installed at COMPASS and preliminary results from those detectors presented very good performance. We present here the project and report on its status, in particular the performance of large size prototypes with an additional GEM foil., 11 pages, 5 figures, proceedings to the Micro-Pattern Gaseous Detectors conference (MPGD2011), 29-31 August 2011, Kobe, Japan
Published: 2011

40. The gain in Thick GEM multipliers and its time-evolution

Author: M. Büchele, L. Steiger, G. Sbrizzai, F. Tessarotto, M. Gregori, M.G. Alexeev, D. Panzieri, K. Königsmann, F. A. Pereira, A. Maggiora, M. Chiosso, K. Novakova, S. Levorato, G. Menon, S. Takekawa, Franco Bradamante, O. Y. Denisov, B. Gobbo, S. Dalla Torre, P. Schiavon, J. Novy, Federica Sozzi, Miroslav Sulc, S. Schopferer, Andrea Bressan, M. Finger, Nour Makke, François Herrmann, Alan D. Martin, H. Fischer, Celso Augusto Guimarães Santos, J.F.C.A. Veloso, R. Birsa, V. Duic, P. Ciliberti, M. Slunečka, S. Dasgupta, Alexeev, M., Birsa, Renato, Bradamante, Franco, Bressan, Andrea, Büchele, M., Chiosso, M., Ciliberti, Piero, Torre, S. Dalla, Dasgupta, SHUDDHA SHANKAR, Denisov, O., Duic, Venicio, Finger, M., Fischer, H., Gobbo, Benigno, Gregori, M., Herrmann, F., Königsmann, K., Levorato, Stefano, Maggiora, A., Makke, Nour, Martin, Anna, Menon, G., Novakova, K., Novy, J., Panzieri, D., Pereira, F. A., Santos, C. A., Sbrizzai, Giulio, Schiavon, Paolo, Schopferer, S., Slunecka, M., Sozzi, Federica, Steiger, Luka, Sulc, M., Takekawa, Stefano, Tessarotto, Fulvio, and Veloso, J. F. C. A.
Subjects: Physics, Photon, Physics::Instrumentation and Detectors, business.industry, Particle tracking detectors (Gaseous detectors), Detector, Time evolution, Electron, Particle detector, Photon detectors for UV, visible and IR photons (gas), Instrumentation, Mathematical Physics, Upgrade, Optics, Measuring instrument, Gas electron multiplier, visible and IR photons (gas), business, Photon detectors for UV
Abstract: In the context of a project to upgrade the gas photon detectors of COMPASS RICH-1, we have performed an R&D programme aimed to develop photon detectors based on multi-layer arrangements of thick GEM electron multipliers coupled to a CsI photoconverter. For this purpose, thick GEMs have been characterised in detail including the gain performance, its dependance on the geometrical parameters and its time-evolution, a feature exhibited by the gas detectors with open insulator surfaces. The variation due to this evolution drammatically depends on the parameters themselves. In the present article we summarise the outcomes of the studies dedicated to the thick GEM gain and its evolution versus time. We also include a qualitative model which accounts for the peculiar details of the observed thick GEM gain time-evolution.
Published: 2015

41. Discharge studies in micromegas detectors in a 150 GeV/c Pion beam

Author: J. Ball, S. Platchkov, D. Neyret, S. Procureur, O. Meunier, P. Konczykowski, H. Moutarde, H. Colas, S. Aune, M. Boyer, A. Morreale, C. Lahonde-Hamdoun, F. Sabatié, A. Giganon, Nour Makke, C. Marchand, B. Moreno, F. Kunne, Y. Bedfer, 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, and Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP)
Subjects: Physics, Nuclear and High Energy Physics, Resistive touchscreen, ta114, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, MicroMegas detector, STRIPS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Magnetic field, law.invention, Nuclear physics, Amplitude, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Instrumentation, Order of magnitude, Beam (structure)
Abstract: International audience; A detailed study of several Micromegas detectors prototyped for the COMPASS and CLAS12 experiments is presented. Using a 150 GeV/c pion beam, the discharge probability was measured for several detector variants including bulk and non-bulk Micromegas. A detector equipped with an additional GEM foil as pre-amplification stage was also tested. A resistive coating of the readout strips was found to reduce the amplitude of the discharge by at least two orders of magnitude which was below the detection limit of the experimental setup. The effects of the micro-mesh type and material were investigated as well as the influence of the drift gap. Response in the presence of a 1.5 T transverse magnetic field was also studied. The measurements presented were performed during a RD51 beam test period.
Published: 2011

42. Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

Author: T. Negrini, M. Chiosso, L. Schmitt, M. Ziembicki, K. Klimaszewski, Andres Cicuttin, G. Reicherz, R. Panknin, N.S. Rossiyskaya, E. Burtin, V.F. Konstantinov, A. Austregesilo, C. Elia, Murray Moinester, S. Dalla Torre, A. Grasso, K. Königsmann, M.G. Sapozhnikov, D.V. Peshekhonov, P.D. Eversheim, H. Fischer, Alan D. Martin, Achim Richter, F. Massmann, G. Pesaro, F. Tessarotto, E. Rondio, O.M. Kouznetsov, S. Ramos, M. Stolarski, C. Heß, I. Gnesi, Johannes Bernhard, A. Guskov, A. Maggiora, S. Neubert, P. Sznajder, Miroslav Sulc, F. Hinterberger, Yu. Kisselev, S. Grabmüller, V.N. Kolosov, M. Bettinelli, Andrea Bressan, E. Perevalova, A. Lehmann, M. Ostrick, Christian Schill, Laura Silva, Aram Kotzinian, R. Windmolders, J. Pochodzalla, R. Sulej, I. Uman, R. Joosten, P. Bordalo, D. Kang, O.P. Gavrichtchouk, L. Sinha, T. Matsuda, V. Duic, P. Jasinski, S.S. Dasgupta, Z.V. Kroumchtein, M. V. Zavertyaev, S. Koblitz, R. Bertini, Andrea Ferrero, J. ter Wolbeek, K. Bicker, C. Marchand, W. Eyrich, G. Piragino, Nour Makke, J. Bieling, J. Barth, L. Lauser, S. Uhl, M. Giorgi, Ch. Höppner, Yu.V. Mikhailov, M. Quaresma, Gerhard K. Mallot, Michal Dziewiecki, O.Yu. Denisov, Takahiro Iwata, A. Vossen, K. Kondo, Y. Bedfer, S. Gerassimov, N. Horikawa, Sergey Donskov, S. Tessaro, K. Schmidt, Norihiro Doshita, A. N. Sissakian, W.-D. Nowak, A. Morreale, P. Schiavon, M. Finger, M. Virius, Yu.A. Khokhlov, R. Gushterski, T. Guthörl, J.M. Friedrich, J. Bisplinghoff, K. Zaremba, S. Huber, Vladimir Nikolaenko, E. Zemlyanichkina, F. Haas, R. Geyer, Soumen Paul, G.I. Smirnov, Fabrice Gautheron, M. A. Faessler, M. Slunecka, W. Wiślicki, B. Gobbo, Yu. Alexandrov, Bakur Parsamyan, C. Quintans, A. Srnka, V.A. Polyakov, A. Korzenev, V.Yu. Alexakhin, N. I. Zhuravlev, A. Zvyagin, R. Birsa, J. Lichtenstadt, L. Wang, G. Sbrizzai, L. Dhara, Federica Sozzi, R. Gazda, S. Das, C. Braun, B. Badelek, S. Schopferer, Franco Bradamante, B. Ketzer, A. Filin, D. Neyret, A. Nagaytsev, F. Balestra, A. Amoroso, K. Schönning, Alexey Antonov, A. Bravar, S. Sosio, A. Mutter, S.-U. Chung, L. G. Tkatchev, S. Takekawa, R. Jahn, Matthias Schott, J. Marzec, G. D. Alexeev, M. Krämer, François Herrmann, W. Dünnweber, C. Franco, A. Mann, N. du Fresne von Hohenesche, T. Schlüter, S. Platchkov, K. Kurek, A.A. Lednev, N.V. Vlassov, Günter Baum, O.Yu. Shevchenko, S. Levorato, E. Rocco, S. Sarkar, F. Nerling, F. Kunne, A. Padee, G.B. Pontecorvo, T. Nagel, J. Pretz, D. Chaberny, R. Garfagnini, C. Adolph, T. Michigami, Oleg V. Ivanov, H. Wollny, Jean-Francois Rajotte, D.I. Ryabchikov, A.S. Nunes, A. Sandacz, D. Panzieri, E. M. Kabuß, I.A. Savin, A.V. Efremov, M.G. Alekseev, I. Konorov, F.H. Heinsius, A.G. Olshevsky, A. Magnon, A. Mielech, S. Ishimoto, Frank Klein, J. Polak, J.H. Koivuniemi, V. Rapatsky, Yu. Ivanshin, S. Goertz, V.D. Samoylenko, B. Grube, D. von Harrach, Maxence Vandenbroucke, G.V. Khaustov, W. Meyer, Maria Liz Crespo, N. dʼHose, C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, Birsa, Renato, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, E., Burtin, D., Chaberny, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, DALLA TORRE, Silvia, S., Da, S. S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., du Fresne von Hohenesche, 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., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., von Harrach, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, N., Horikawa, Höppner, C. h., N., Dʼhose, S., Huber, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, P., Jasinski, R., Joosten, E., Kabuß, 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., Königsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, F., Massmann, T., Matsuda, W., Meyer, T., Michigami, A., Mielech, Mikhailov, Y. u. V., M. A., Moinester, A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, G., Pontecorvo, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, Rocco, Elena, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, K., Schmidt, L., Schmitt, K., Schönning, S., Schopferer, M., Schott, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, M., Stolarski, M., Sulc, R., Sulej, P., Sznajder, S., Takekawa, J., Ter Wolbeek, Tessaro, Susanna, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, A., Vossen, L., Wang, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: Nuclear and High Energy Physics, Particle physics, COMPASS, SIDIS, two hadron azimuthal asymmetries, transversity, Hadron, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, Large Hadron Collider, Muon, Spectrometer, ta114, 010308 nuclear & particles physics, Scattering, two hadron azimuthal asymmetrie, High Energy Physics::Phenomenology, Deep inelastic scattering, Pair production, Distribution function, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are presented. The data were taken in the years 2002-2004 and 2007 with the COMPASS spectrometer using a muon beam of 160 GeV/c at the CERN SPS. The asymmetries provide access to the transversity distribution functions, without involving the Collins effect as in single hadron production. The sizeable asymmetries measured on the NH_ target indicate non-vanishing u-quark transversity and two-hadron interference fragmentation functions. The small asymmetries measured on the ^6LiD target can be interpreted as indication for a cancellation of u- and d-quark transversities., Comment: 13 pages, 4 figures, updated to the published version
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43. Erratum to: Hadron transverse momentum distributions in muon deep inelastic scattering at 160 GeV/ $$c$$ c

Author: M.G. Sapozhnikov, Alexander Schmidt, T. Nagel, J. Pretz, V.N. Kolosov, W.-D. Nowak, M. Ziembicki, Lei Wang, P. Schiavon, T. Michigami, M. Virius, Laura Silva, S.S. Dasgupta, A.G. Olshevsky, I. Gnesi, Christian Schill, F. H. Heinsius, M. Krämer, D. Neyret, A. Sandacz, R. Joosten, M.G. Alekseev, K. Bicker, V. Andrieux, A. Austregesilo, S. Dasgupta, C. Elia, A. Srnka, Miroslav Sulc, F. Hinterberger, M. V. Zavertyaev, J. Novy, H. Matsuda, J. Marzec, M. Chiosso, S. Goertz, E. M. Kabuß, O.P. Gavrichtchouk, L. Sinha, M. Boer, W. Wiślicki, Anne-Laure Martin, L. Schmitt, T. Matsuda, L. Capozza, K. Kondo, B. Gobbo, K. Kurek, L. Steiger, S. Neubert, J. Lichtenstadt, S. Platchkov, M. Büchele, J. Polak, Y. Bedfer, B. Grube, J.H. Koivuniemi, C. Marchand, P. Bordalo, N. I. Zhuravlev, Fabrice Gautheron, A. Nagaytsev, F. Balestra, Günter Baum, O.Yu. Shevchenko, S. Levorato, E. Burtin, G. Piragino, Federica Sozzi, E. Rondio, M. A. Faessler, R. Jahn, S. Schopferer, K. Schmidt, V.Yu. Alexakhin, I.A. Savin, K. Zaremba, M. Wilfert, Norihiro Doshita, K. Königsmann, N. d'Hose, R. Bertini, Andrea Ferrero, A.A. Lednev, P.D. Eversheim, Yu. Kisselev, R.P. Kurjata, F. Haas, R. Geyer, I. Konorov, S. Uhl, M. Giorgi, R. Sulej, M. Slunečka, S.-U. Chung, H. Suzuki, C. Quintans, V.A. Polyakov, F. Nerling, C. Heß, V. K. Rodionov, Z.V. Kroumchtein, Michal Dziewiecki, A. Maggiora, W. Eyrich, R. Garfagnini, M. Finger, A. Magnon, M. Ostrick, G. Sbrizzai, François Herrmann, G. D. Alexeev, Nour Makke, J. Bieling, S. Takekawa, Frank Klein, W. Dünnweber, O. Kouznetsov, M. Quaresma, A. Amoroso, Franco Bradamante, S. Grabmüller, R. Panknin, N. du Fresne von Hohenesche, T. Schlüter, E. Rocco, A. Mann, N.S. Rossiyskaya, R. Birsa, V. Duic, J. Pochodzalla, H. Wollny, Yu. Ivanshin, O.Yu. Denisov, C. Adolph, A. Grasso, F. Kunne, D. Kang, A.V. Efremov, Jean-Francois Rajotte, D.I. Ryabchikov, A.S. Nunes, D. Panzieri, F. Thibaud, J. Barth, Gerhard K. Mallot, T. Weisrock, Aram Kotzinian, R. Windmolders, P. Jasinski, J. ter Wolbeek, R. Gushterski, S. Gerassimov, T. Guthörl, N. Horikawa, Sergey Donskov, Asher Berlin, S. Tessaro, A. Morreale, Yu.A. Khokhlov, Ch. Höppner, S. Sarkar, Alessandro Bressan, D. von Harrach, K. Schönning, Maxence Vandenbroucke, A. Bravar, S. Sosio, V.D. Samoylenko, G.V. Khaustov, W. Meyer, Maria Liz Crespo, V. Jary, C. Franco, C. Braun, B. Badelek, B. Ketzer, A. Filin, H. Schmieden, Marcin Stolarski, J.M. Friedrich, N. Kuchinski, I. Uman, J. Bisplinghoff, S. Huber, Vladimir Nikolaenko, S. Ramos, E. Zemlyanichkina, P. Sznajder, V.F. Konstantinov, S. Ishimoto, H. Fischer, F. Tessarotto, A. Lehmann, Yu.V. Mikhailov, K. Klimaszewski, Takahiro Iwata, Yu. Alexandrov, Andres Cicuttin, G. Reicherz, Bakur Parsamyan, Johannes Bernhard, A. Guskov, S. Dalla Torre, V. Frolov, Soumen Paul, Matthias Schott, G.V. Meshcheryakov, and S. Sirtl
Subjects: Nuclear physics, Physics, Muon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, 0103 physical sciences, Hadron, Transverse momentum, 010306 general physics, Deep inelastic scattering, 01 natural sciences, Engineering (miscellaneous)
Abstract: Author(s): Adolph, C; Alekseev, MG; Alexakhin, VY; Alexandrov, Y; Alexeev, GD; Amoroso, A; Andrieux, V; Austregesilo, A; Badelek, B; Balestra, F; Barth, J; Baum, G; Bedfer, Y; Berlin, A; Bernhard, J; Bertini, R; Bicker, K; Bieling, J; Birsa, R; Bisplinghoff, J; Boer, M; Bordalo, P; Bradamante, F; Braun, C; Bravar, A; Bressan, A; Buchele, M; Burtin, E; Capozza, L; Chiosso, M; Chung, SU; Cicuttin, A; Crespo, ML; Dalla Torre, S; Dasgupta, SS; Dasgupta, S; Denisov, OY; Donskov, SV; Doshita, N; Duic, V; Dunnweber, W; Dziewiecki, M; Efremov, A; Elia, C; Eversheim, PD; Eyrich, W; Faessler, M; Ferrero, A; Filin, A; Finger, M; Finger Jr, M; Fischer, H; Franco, C; du Fresne von Hohenesche, N; Friedrich, JM; Frolov, V; Garfagnini, R; Gautheron, F; Gavrichtchouk, OP; Gerassimov, S; Geyer, R; Giorgi, M; Gnesi, I; Gobbo, B; Goertz, S; Grabmuller, S; Grasso, A; Grube, B; Gushterski, R; Guskov, A; Guthorl, T; Haas, F; von Harrach, D; Heinsius, FH; Herrmann, F; Hes, C; Hinterberger, F; Hoppner, C; Horikawa, N; d’Hose, N; Huber, S; Ishimoto, S; Ivanshin, Y; Iwata, T; Jahn, R
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