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193 results on '"Schacher, J"'

1. Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms

Author

Adeva, B., Afanasyev, L., Allkofer, Y., Amsler, C., Anania, A., Aogaki, S., Benelli, A., Brekhovskikh, V., Caragheorgheopol, Gh., Cechak, T., Chiba, M., Chliapnikov, P., Ciocarlan, C., Constantinescu, S., Detraz, C., Doskarova, P., Drijard, D., Dudarev, A., Duma, M., Dumitriu, D., Fluerasu, D., Gorin, A., Gorchakov, O., Gritsay, K., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Horikawa, S., Iwashita, Y., Karpukhin, V., Kluson, J., Kobayashi, M., Kruglov, V., Kruglova, L., Kulikov, A., Kulish, E., Kuptsov, A., Lamberto, A., Lanaro, A., Lednicky, R., Mariñas, C., Martincik, J., Nemenov, L., Nikitin, M., Okada, K., Olchevskii, V., Pentia, M., Penzo, A., Plo, M., Prusa, P., Rappazzo, G.F., Vidal, A. Romero, Ryazantsev, A., Rykalin, V., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Tauscher, L., Trojek, T., Trusov, S., Ullaland, O., Urban, T., Vrba, T., Yazkov, V., Yoshimura, Y., Zhabitsky, M., and Zrelov, P.

Published
2016
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2. Investigation of <math><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math> pairs in the effective mass region near <math><mn>2</mn><msub><mi>m</mi><mi>K</mi></msub></math>

Author

Adeva, B., Afanasyev, L., Anania, A., Aogaki, S., Benelli, A., Brekhovskikh, V., Cechak, T., Chiba, M., Chliapnikov, P., Drijard, D., Dudarev, A., Dumitriu, D., Federicova, P., Gorin, A., Gritsay, K., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Horikawa, S., Iwashita, Y., Karpukhin, V., Kluson, J., Kobayashi, M., Kruglova, L., Kulikov, A., Kulish, E., Lamberto, A., Lanaro, A., Lednicky, R., Mari??as, C., Martincik, J., Nemenov, L., Nikitin, M., Okada, K., Olchevskii, V., Pentia, M., Penzo, A., Plo, M., Prusa, P., Rappazzo, G., Romero Vidal, A., Ryazantsev, A., Rykalin, V., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Trojek, T., Trusov, S., Urban, T., Vrba, T., Yazkov, V., Yoshimura, Y., and Zrelov, P.

Abstract

The DIRAC experiment at CERN investigated in the reaction p(24 GeV/c)+Ni the particle pairs K+K−,π+π−, and pp¯ with relative momentum Q in the pair system less than 100 MeV/c. Because of background influence studies, DIRAC explored three subsamples of K+K− pairs, obtained by subtracting-using the time-of-flight (TOF) technique-the background from initial Q distributions with K+K− sample fractions more than 70%, 50%, and 30%. The corresponding pair distributions in Q and in its longitudinal projection QL were analyzed first in a Coulomb model, which takes into account only the Coulomb final-state interaction (FSI) and assuming pointlike pair production. This Coulomb model analysis leads to a K+K− yield increase of about four at QL=0.5 MeV/c compared to 100 MeV/c. In order to study contributions from strong interaction, a second more sophisticated model was applied, considering also strong FSI via the resonances f0(980) and a0(980) and a variable distance r* between the produced K mesons besides Coulomb FSI. This analysis was based on three different parameter sets for the pair production. For the 70% subsample and with the best parameters, 3680±370 K+K− pairs were found to be compared to 3900±410 K+K− extracted by means of the Coulomb model. Knowing the efficiency of the TOF cut for background suppression, the total number of detected K+K− pairs was evaluated to be around 40000±10%, which agrees with the result from the 30% subsample. The K+K− pair number in the 50% subsample differs from the two other values by about three standard deviations, confirming—as discussed in the paper—that experimental data in this subsample is less reliable. In summary, the upgraded DIRAC experiment observed increased K+K− production at small relative momentum Q. The pair distribution in Q is well described by Coulomb FSI, whereas a potential influence from strong interaction in this Q region is insignificant within experimental errors.

Published
2022

5. Strangelet search and particle production studies in Pb+Pb collisions at 158 AGeV/c at CERN SPS

Author

Stoffel, F., Ambrosini, G., Appelquist, G., Arsenescu, R., Baglin, C., Beringer, J., Bohm, C., Borer, K., Bussière, A., Dittus, F., Elsener, K., Frei, D., Gorodetzky, Ph., Guillaud, J. P., Hess, P., Hugentobler, E., Kabana, S., Klingenberg, R., Lindén, T., Lohmann, K. D., Mommsen, R., Moser, U., Pal, T., Pretzl, K., Schacher, J., Selldén, B., Stoffel, F., Tuominiemi, J., Weber, M., Zhang, Q. P., and the Newmass (NA52) Collaboration

Published
1996
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6. A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN $$\bar pp$$ collider

Author

Alitti, J., Ambrosini, G., Ansari, R., Autiero, D., Bareyre, P., Bertram, I. A., Blaylock, G., Bonamy, P., Bonesini, M., Borer, K., Bourliaud, M., Buskulic, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, J. C., Conta, C., Costa, G., Costantini, F., Cozzi, L., Cravero, A., Curatolo, M., Dell'Acqua, A., DelPrete, T., DeWolf, R. S., DiLella, L., Ducros, Y., Egan, G. F., Einsweiler, K. F., Esposito, B., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. M., Gianotti, F., Gildemeister, O., Gössling, C., Goggi, V. G., Grünendahl, S., Hara, K., Hellman, S., Hrivnac, J., Hufnagel, H., Hugentobler, E., Hultqvist, K., Iacopini, E., Incandela, J., Jakobs, K., Jenni, P., Kluge, E. E., Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Livan, M., Lubrano, P., Magneville, C., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, J. P., Moniez, M., Moning, R., Morganti, M., Müller, L., Munday, D. J., Nessi, M., Nessi-Tedaldi, F., Onions, C., Pal, T., Parker, M. A., Parrour, G., Pastore, F., Pennacchio, E., Pentney, J. M., Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothow-Besch, H., Polesello, G., Poppleton, A., Pretzl, K., Primavera, M., Punturo, M., Repellin, J. P., Rimoldi, A., Sacchi, M., Scampoli, P., Schacher, J., Simak, V., Singh, S. L., Sondermann, V., Stapnes, S., Stirling, A. V., Talamonti, C., Tondini, F., Tovey, S. N., Tsesmelis, E., Unal, G., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wells, P. S., White, T. O., Wood, D. R., Wotton, S. A., Zaccone, H., Zylberstejn, A., and UA2 Collaboration

Published
1991
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7. A measurement of two-jet decays of theW andZ bosons at the CERN $$\bar p$$ p collider

Author

Alitti, J., Ansari, R., Ansorge, R. E., Autiero, D., Bareyre, P., Blaylock, G., Bonamy, P., Bonesini, M., Borer, K., Bourliaud, M., Buskulic, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, J. C., Conta, C., Costa, G., Costantini, F., Cravero, A., Dell'Acqua, A., DelPrete, T., DeWolf, R. S., DiLella, L., Egan, G. F., Einsweiler, K. F., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. M., Gianotti, F., Gildemeister, O., Gössling, C., Goggi, V. G., Grünendahl, S., Hara, K., Hellman, S., Hugentobler, E., Hultqvist, K., Iacopini, E., Incandela, J., Jakobs, K., Jenni, P., Kluge, E. E., Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Livan, M., Lubrano, P., Magneville, C., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, J. P., Moniez, M., Moning, R., Morganti, M., Müller, L., Munday, D. J., Onions, C., Pal, T., Parker, M. A., Parrour, G., Pastore, F., Pennacchio, E., Pentney, J. M., Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothow-Besch, H., Polesello, G., Poppleton, A., Pretzl, K., Primavera, M., Punturo, M., Rasmussen, L., Repellin, J. P., Rimoldi, A., Scampoli, P., Schacher, J., Simak, V., Singh, S. L., Stapnes, S., Stirling, A. V., Tondini, F., Tovey, S. N., Tsesmelis, E., Unal, G., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wells, P. S., White, T. O., Wood, D. R., Wotton, S. A., Zaccone, H., and UA2 Collaboration

Published
1991
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8. Measurement of the transverse momentum distributions ofW andZ bosons at the CERN $$\bar pp$$ collider

Author

Alitti, J., Ansari, R., Ansorge, R. E., Autiero, D., Bagnaia, P., Bareyre, P., Blaylock, G., Bonamy, P., Bonesini, M., Booth, C. N., Borer, K., Buskulic, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, J. C., Conta, C., Costa, G., Costantini, F., Dell'Acqua, A., DeLotto, B., DelPrete, T., DeWolf, R. S., DiLella, L., Egan, G. F., Einsweiler, K. F., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. M., Gianotti, F., Gildemeister, O., Gössling, C., Goggi, V. G., Grünendahl, S., Hara, K., Hellman, S., Hugentobler, E., Hultqvist, K., Iacopini, E., Incandela, J., Jakobs, K., Jenni, P., Kluge, E. E., Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Livan, M., Lubrano, P., Magneville, C., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, J. P., Moniez, M., Moning, R., Morganti, M., Müller, L., Munday, D. J., Onions, C., Pal, T., Parker, M. A., Parrour, G., Pastore, F., Pennacchio, E., Pentney, J. M., Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothow-Besch, H., Polesello, G., Poppleton, A., Primavera, M., Rasmussen, L., Repellin, J. P., Rimoldi, A., Scampoli, P., Schacher, J., Singh, S. L., Stapnes, S., Stirling, A. V., Tovey, S. N., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wells, P. S., White, T. O., Wood, D. R., Wotton, S. A., Zaccone, H., and UA 2 Collaboration

Published
1990
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9. Search for top quark production at the CERN $$\bar pp$$ collider

Author

Åkesson, T., Alitti, J., Ansari, R., Ansorge, R. E., Bagnaia, P., Bareyre, P., Blaylock, G., Bonamy, P., Bonesini, M., Borer, K., Buskulie, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, J. C., Conta, C., Costa, G., Costantini, F., Dell'Acqua, A., De Lotto, B., Del Prete, T., De Wolf, R. S., Di Lella, L., Egan, G. F., Einsweiler, K. F., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. M., Gianotti, F., Gildemeister, O., Gössling, C., Goggi, V. G., Grünendahl, S., Hansen, J. R., Hara, K., Hellman, S., Hugentobler, E., Hultqvist, K., Iacopini, E., Incandela, J., Jakobs, K., Jenni, P., Kluge, E. E., Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Livan, M., Lubrano, P., Magneville, C., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, J. P., Moniez, M., Moning, R., Morganti, M., Müller, L., Munday, D. J., Onions, C., Pal, T., Parker, M. A., Parrour, G., Pastore, F., Pennacchio, E., Pentney, J. M., Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothow-Besch, H., Primavera, M., Polesello, G., Poppleton, A., Rasmussen, L., Repellin, J. P., Rimoldi, A., Rushbrooke, J. G., Scampoli, P., Schacher, J., Singh, S. L., Stapnes, S., Stirling, A. V., Tovey, S. N., Unal, G., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wells, P. S., White, T. O., Wood, D. R., Wotton, S. A., Zaccone, H., and UA 2 Collaboration

Published
1990
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10. Measurement ofW andZ production cross sections at the CERN $$\bar p$$ p collider

Author

Alitti, J., Ansari, R., Ansorge, R. E., Bagnaia, P., Bareyre, P., Blaylock, G., Bonamy, P., Bonesini, M., Booth, C. N., Borer, K., Buskulic, D., Carboni, G., Cavalli, D., Cavasinni, V., Cenci, P., Chollet, J. C., Conta, C., Costa, G., Costantini, F., Crittenden, J., Dell'Acqua, A., DeLotto, B., DelPrete, T., DeWolf, R. S., DiLella, L., Egan, G. F., Einsweiler, K. F., Fayard, L., Federspiel, A., Ferrari, R., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. M., Gianotti, F., Gildemeister, O., Gössling, C., Goggi, V. G., Grünendahl, S., Hara, K., Hellman, S., Hugentobler, E., Hultqvist, K., Iacopini, E., Incandela, J., Jakobs, K., Jenni, P., Kluge, E. E., Kurz, N., Lami, S., Lariccia, P., Lefebvre, M., Linssen, L., Lisowski, B., Livan, M., Lubrano, P., Magneville, C., Mandelli, L., Mapelli, L., Mazzanti, M., Meier, K., Merkel, B., Meyer, J. P., Moniez, M., Moning, R., Morganti, M., Müller, L., Munday, D. J., Onions, C., Pal, T., Parker, M. A., Parrour, G., Pastore, F., Pennacchio, E., Pentney, J. M., Pepe, M., Perini, L., Petridou, C., Petroff, P., Plothow-Besch, H., Polesello, G., Poppleton, A., Punturo, M., Rasmussen, L., Repellin, J. P., Rimoldi, A., Rushbrooke, J. G., Scampoli, P., Schacher, J., Singh, S. L., Stapnes, S., Stirling, A. V., Tondini, F., Tovey, S. N., Tsesmelis, E., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wells, P. S., White, T. O., Wood, D. R., Wotton, S. A., Zaccone, H., and UA2 Collaboration

Published
1990
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11. DIRAC: A high resolution spectrometer for pionium detection

Author

Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Cima, E., Constantinescu, S., Detraz, C., Dreossi, D., Drijard, D., Dudarev, A., Evangelou, I., Ferro-Luzzi, M., Gallas, M.V., Gerndt, J., Giacomich, R., Gianotti, P., Giardoni, M., Goldin, D., Gómez, F., Gorin, A., Gortchakov, O., Guaraldo, C., Hansroul, M., Iliescu, M., Zhabitsky, M., Karpukhin, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Kruglov, V., Kruglova, L., Kulikov, A., Kuptsov, A., Kurochkin, V., Kuroda, K.-I., Lamberto, A., Lanaro, A., Lapshin, V., Lednicky, R., Leruste, P., Levisandri, P., Lopez Aguera, A., Lucherini, V., Maki, T., Manthos, N., Manuilov, I., Montanet, L., Narjoux, J.-L., Nemenov, L., Nikitin, M., Núñez Pardo, T., Okada, K., Olchevskii, V., Orecchini, D., Pazos, A., Pentia, M., Penzo, A., Perreau, J.-M., Petrascu, C., Pló, M., Ponta, T., Pop, D., Rappazzo, G.F., Riazantsev, A., Rodriguez, J.M., Rodriguez Fernandez, A., Romero, A., Rykalin, V., Santamarina, C., Saborido, J., Schacher, J., Schuetz, Ch.P., Sidorov, A., Smolik, J., Steinacher, M., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M.J., Triantis, F., Trusov, S., Utkin, V., Vázquez Doce, O., Vázquez, P., Vlachos, S., Yazkov, V., Yoshimura, Y., and Zrelov, P.

Published
2003
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12. Summary Report of Physics Beyond Colliders at CERN

Author

Alemany, R., Burrage, C., Bartosik, H., Johannes Bernhard, Boyd, J., Brugger, M., Calviani, M., Carli, C., Charitonidis, N., Curtin, D., Dainese, A., Roeck, A., Diehl, M., Döbrich, B., Evans, L., Feng, J. L., Ferro-Luzzi, M., Gatignon, L., Gilardoni, S., Gninenko, S., Graziani, G., Gschwendtner, E., Goddard, B., Hartin, A., Irastorza, I., Jaeckel, J., Jacobsson, R., Jungmann, K., Kirch, K., Kling, F., Krasny, W., Lamont, M., Lanfranchi, G., Lansberg, J-P, Lindner, A., Long, K., Magnon, A., Mallot, G., Martinez Vidal, F., Moulson, M., Papucci, M., Pawlowski, J. M., Pedraza, I., Petridis, K., Pospelov, M., Pulawski, S., Redaelli, S., Rozanov, S., Rumolo, G., Ruoso, G., Schacher, J., Schnell, G., Schuster, P., Semertzidis, Y., Siemko, A., Spadaro, T., Stapnes, S., Stocchi, A., Ströher, H., Usai, G., Vallée, C., Venanzoni, G., Wilkinson, G., Wing, M., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), 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), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics - Instrumentation and Detectors, CERN Lab, accelerator, Physics::Instrumentation and Detectors, FOS: Physical sciences, CERN SPS: upgrade, DIRAC, bibliography, Instrumentation and Detectors (physics.ins-det), landscape, COMPASS, NA62, High Energy Physics - Experiment, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], CERN LHC Coll: upgrade, AWAKE, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, proposed experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its scientific infrastructure in the next two decades through projects complementary to the LHC, HL-LHC and other possible future colliders. These projects should target fundamental physics questions that are similar in spirit to those addressed by high-energy colliders, but that require different types of beams and experiments. A kick-off workshop held in September 2016 identified a number of areas of interest and working groups have been set-up to study and develop these directions. All projects currently under consideration are presented including physics motivation, a brief outline of the experimental set-up and the status of the corresponding beam and detector technological studies. The proposals are also put in context of the worldwide landscape and their implementation issues are discussed., Comment: This document (66 pages, 19 figures) is the summary document of the Physics Beyond Colliders (PBC) study. It follows the PBC mandate and draws on a whole set of documents produced in the context of PBC (https://pbc.web.cern.ch), in particular the reports of the QCD and BSM working groups also available at arXiv:1901.04482 and arXiv:1901.09966

Published
2019

13. Summary Report of Physics Beyond Colliders at CERN

Author

Alemany, R, C., Burrage, Bartosik, H, Bernhardt, J, Boyd, J, Brugger, Markus, Calviani, M, Carli, C, Charitonidis, N, Curtin, D, Dainese, A, de Roeck, A, Diehl, M, Doebrich, B, Evans, L, Ferro-Luzzi, M, Feng, JL, Gatignon, L, Gilardoni, S, Gninenko, S, Graziani, G, Gschwendtner, E, Goddard, B, Hartin, A, Irastorza, I, Jaeckel, J, Jungmann, Klaus-Peter, Jacobsson, R, Kirch, K, Kling, F, Krasny, W, Lamont, M, Lanfranchini, G, Lansberg, JP, Lindner, A, Long, K, Magnon, A, Mallot, G, Martinez Vidal, F, Moulson, M, Papucci, M, Pawlowski, JM, Pedraza, I, Petridis, K, Pospelov, M, Pulawski, S, Radaelli, S, Rozanov, S, Rumolo, G, Ruoso, G, Schacher, J, Schnell, G, Schuster, P, Semertzidis, Y, Siemko, A, Spadaro, T, Stapnes, S, Stocchi, A, Stroeher, H., Usai, G, Vallee, C, Venanzoni, G, Wilkinson, G, Wing, M, and Precision Frontier

Abstract

Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its scientific infrastructure in the next two decades through projects complementary to the LHC, HL-LHC and other possible future colliders. These projects should target fundamental physics questions that are similar in spirit to those addressed by high-energy colliders, but that require different types of beams and experiments. A kick-off workshop held in September 2016 identified a number of areas of interest and working groups have been set-up to study and develop these directions. All projects currently under consideration are presented including physics motivation, a brief outline of the experimental set-up and the status of the corresponding beam and detector technological studies. The proposals are also put in context of the worldwide landscape and their implementation issues are discussed. Comments: This document (66 pages, 19 figures) is the summary document of the Physics Beyond Colliders (PBC) study. It follows the PBC mandate and draws on a whole set of documents produced in the context of PBC (this https URL), in particular the reports of the QCD and BSM working groups also available at arXiv: 1901.04482 and arXiv: 1901.09966

Published
2019

14. Physics Beyond Colliders: QCD Working Group Report

Author

Dainese, A., Diehl, M., Di Nezza, P., Friedrich, J., Gaździcki, M., Graziani, G., Hadjidakis, C., Jäckel, J., Lansberg, J. P., Magnon, A., Mallot, G., Vidal, F. Martinez, Massacrier, L. M., Nemenov, L., Neri, N., Pawlowski, J. M., Puławski, S. M., Schacher, J., Schnell, G., Stocchi, A., Usai, G. L., Vallée, C., Venanzoni, G., Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de l'Accélérateur Linéaire (LAL), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), QCD Working Group, 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), and Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Drell-Yan process, p p: scattering, CERN Lab, heavy ion: scattering, Nuclear Theory, Physics::Instrumentation and Detectors, High Energy Physics::Lattice, energy loss, p nucleus: interaction, pi: structure function, FOS: Physical sciences, K: secondary beam, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], muon p: elastic scattering, gluon: polarization, COMPASS, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), ALICE, quantum chromodynamics, target: wire, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, bent crystal, gas: polarized target, hadron spectroscopy, High Energy Physics::Phenomenology, nuclear matter: effect, nucleon: structure function, collective phenomena, High Energy Physics - Phenomenology, CERN LHC Coll, forward production, Physics::Accelerator Physics, High Energy Physics::Experiment, proposed experiment, quark: polarization, lead: nucleus, resonance: production
Abstract

International audience; This report summarises the main findings of the QCD Working Group in the CERN Physics Beyond Colliders Study.

Published
2019

15. First measurement of a long-lived $\pi^+ \pi^-$ atom lifetime

Author

Adeva, B., Afanasyev, L., Anania, A., Aogaki, S., Benelli, A., Brekhovskikh, V., Cechak, T., Chiba, M., Chliapnikov, P.V., Doskarova, P., Drijard, D., Dudarev, A., Dumitriu, D., Fluerasu, D., Gorin, A., Gorchakov, O., Gritsay, K., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Horikawa, S., Iwashita, Y., Karpukhin, V., Kluson, J., Kobayashi, M., Kruglov, V., Kruglova, L., Kulikov, A., Kulish, E., Lamberto, A., Lanaro, A., Lednicky, R., Mariñas, C., Martincik, J., Nemenov, L., Nikitin, M., Okada, K., Olchevskii, V., Ovsiannikov, V., Pentia, M., Penzo, A., Plo, M., Prusa, P., Rappazzo, G.F., Romero Vidal, A., Ryazantsev, A., Rykalin, V., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Trojek, T., Trusov, S., Vrba, T., Yazkov, V., Yoshimura, Y., and Zrelov, P.

Subjects
hep-ex, Nuclear Physics - Experiment, Physics::Atomic Physics, nucl-ex, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogen-like $\pi^+\pi^-$ atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96~mm and got broken up in the 2.1~\textmu{}m thick platinum foil. Analysing the observed number of atomic pairs, $n_A^L= \left.436^{+157}_{-61}\right|_\mathrm{tot}$, the lifetime of the 2$p$ state is found to be ${\tau_{2p}=(\left.0.45^{+1.08}_{-0.30}\right|_\mathrm{tot}) \cdot10^{-11}}$s, not contradicting the corresponding QED $2p$ state lifetime ${\tau_{2p}^\mathrm{QED}=1.17 \cdot 10^{-11}}$s. This lifetime value is three orders of magnitude larger than our previously measured value of the $\pi^+\pi^-$ atom ground state lifetime $\tau=(\left.3.15^{+0.28}_{-0.26}\right|_\mathrm{tot})\cdot 10^{-15}$s. Further studies of long-lived $\pi^+\pi^-$ atoms will allow to measure energy differences between $p$ and $s$ atomic states and so to determine $\pi\pi$ scattering lengths with the aim to check QCD predictions., Comment: 7 pages, 8 figures

Published
2018

16. Dirac experiment

Author

Gómez, F., Adeva, B., Afanasev, L., Benayoun, M., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Constantinescu, S., Doudarev, A., Dreossi, D., Drijard, D., Ferro-Luzzi, M., Gallas, M.V., Gerndt, J., Giacomich, R., Gianotti, P., Goldin, D., Gorin, A., Gortchakov, O., Guaraldo, C., Hansroul, M., Hosek, R., Iliescu, M., Jabitski, M., Kalinina, N., Karpoukhine, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Koulikov, A., Kouptsov, A., Krouglov, V., Krouglova, L., Kuroda, K.-I., Lanaro, A., Lapshine, V., Lednicky, R., Leruste, P., Levisandri, P., Lopez Aguera, A., Lucherini, V., Maki, T., Manuilov, I., Montanet, L., Narjoux, J.-L., Nemenov, L., Nikitin, M., Nunez Pardo, T., Okada, K., Olchevskii, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J.-M., Petrascu, C., Plo, M., Ponta, T., Pop, D., Riazantsev, A., Rodriguez, J.M., Rodriguez Fernandez, A., Rykaline, V., Santamarina, C., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M.J., Trusov, S., Vazquez, P., Vlachos, S., Yazkov, V., Yoshimura, Y., and Zrelov, P.

Published
2001
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17. Measurement of the $\pi K$ atom lifetime and the $\pi K$ scattering length

Author

DIRAC Collaboration, Adeva, B., Afanasyev, L., Allkofer, Y., Amsler, C., Anania, A., Aogaki, S., Benelli, A., Brekhovskikh, V., Cechak, T., Chiba, M., Chliapnikov, P., Drijard, D., Dudarev, A., Dumitriu, D., Federicova, P., Fluerasu, D., Gorin, A., Gorchakov, O., Gritsay, K., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Horikawa, S., Iwashita, Y., Karpukhin, V., Kluson, J., Kobayashi, M., Kruglov, V., Kruglova, L., Kulikov, A., Kulish, E., Kuptsov, A., Lamberto, A., Lanaro, A., Lednicky, R., Marinas, C., Martincik, J., Nemenov, L., Nikitin, M., Okada, K., Olchevskii, V., Pentia, M., Penzo, A., Plo, M., Prusa, P., Rappazzo, G., Vidal, A. Romero, Ryazantsev, A., Rykalin, V., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Tauscher, L., Trojek, T., Trusov, S., Urban, T., Vrba, T., Yazkov, V., Yoshimura, Y., Zhabitsky, M., and Zrelov, P.

Subjects
Nuclear Physics - Experiment, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

After having announced the statistically significant observation (5.6~$\sigma$) of the new exotic $\pi K$ atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full $\pi K$ data sample: $\tau = (5.5^{+5.0}_{-2.8}) \cdot 10^{-15}s$. By means of a precise relation ($, Comment: 18 pages, 17 figures

Published
2017

19. Jet measures and hadronic event shapes at the CERN $$\bar p$$ p collider

Author

Ansari, R., Bagnaia, P., Banner, M., Battiston, R., Bernlöhr, K., Booth, C., Borer, K., Borghini, M., Carboni, G., Cavasinni, V., Cenci, P., Chollet, J. -C., Clark, A. G., Conta, C., Costantini, F., Darriulat, P., De Lotto, B., Del Prete, T., DiLella, L., Dines-Hansen, J., Einsweiler, K., Fayard, L., Ferrari, R., Fraternali, M., Froidevaux, D., Gaillard, J. -M., Gildemeister, O., Goggi, V. G., Gössling, C., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Hara, K., Harnew, N., Hugentobler, E., Iacopini, E., Iconomidou-Fayard, L., Jakobs, K., Jenni, P., Kluge, E. E., Kofoed-Hansen, O., Lançon, E., Lariccia, P., Livan, M., Loucatos, S., Madsen, B., Mansoulié, B., Mantovani, G. C., Mapelli, L., Meier, K., Merkel, B., Möllerud, R., Moniez, M., Moning, R., Morganti, M., Onions, C., Parker, M. A., Parrour, G., Pastore, F., Pepe, M., Petridou, Ch., Plothow-Besch, H., Polverel, M., Rasmussen, L., Repellin, J. -P., Rimoldi, A., Roussarie, A., Ruhlmann, V., Sauvage, G., Schacher, J., Stapnes, S., Stocker, F., Swartz, M., Teiger, J., Tsang, W. Y., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wunsch, M., Zaccone, H., and UA 2 Collaboration

Published
1987
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21. Buchbesprechungen

Author

Rott, N., Schneebeli, H. R., Hässig, K., Läuchli, H., Zwahlen, Bruno, Schaufelberger, W., Mihăilescu, P., Amann, H., Schacher, J., Straumann, N., Affolter, Klaus, Ammann, U., Marti, J., Engeler, E., Gyr, A., and Melchior, H.

Published
1982
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23. Inclusive particle production in the transverse momentum range between 0.25 and 40 GeV/c at the CERN $$Sp\bar pS$$ collider

Author

Banner, M., Bloch, Ph., Bonaudi, F., Borer, K., Borghini, M., Chollet, J. C., Clark, A. G., Conta, C., Darriulat, P., Di Lella, L., Hansen, J. Dines, Dorsaz, P. A., Fayard, L., Fraternali, M., Froidevaux, D., Gaillard, J. M., Gildemeister, O., Goggi, V. G., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Himel, T., Hungerbühler, V., Jenni, P., Kofoed-Hansen, O., Lançon, E., Livan, M., Loucatos, S., Madsen, B., Mani, P., Mansoulié, B., Mantovani, G. C., Mapelli, L., Merkel, B., Møllerud, R., Onions, C., Parrour, G., Pastore, F., Plothow-Besch, H., Polverel, M., Repellin, J. P., Rimoldi, A., Rothenberg, A., Roussarie, A., Sauvage, G., Schacher, J., Siegrist, J. L., Stocker, F., Teiger, J., Vercesi, V., Weidberg, A., Zaccone, H., Zeller, W., and UA2 Collaboration

Published
1985
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25. A study of three-jet events at the CERN $$\bar pp$$ collider

Author

Appel, J. A., Bagnaia, P., Banner, M., Battiston, R., Bernlöhr, K., Borer, K., Borghini, M., Bürger, J., Carboni, G., Cavasinni, V., Cenci, P., Chollet, J. -C., Clark, A. G., Codino, A., Conta, C., Darriulat, P., De Lotto, B., Del Prete, T., Di Lella, L., Dines-Hansen, J., Einsweiler, K., Engelmann, R., Fayard, L., Fraternali, M., Froidevaux, D., Gaillard, J. -M., Gildemeister, O., Goggi, V. G., Gössling, C., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Harnew, N., Himel, T., Iconomidou-Fayard, L., Jakobs, K., Jenni, P., Kluge, E. E., Kofoed-Hansen, O., Lançon, E., Livan, M., Loucatos, S., Madsen, B., Mani, P., Mansoulié, B., Mantovani, G. C., Mapelli, L., Meier, K., Merkel, B., Mollerud, R., Moniez, M., Moning, R., Morganti, M., Onions, C., Parker, M. A., Parrour, G., Pastore, F., Pepe, M., Plothow-Besch, H., Polverel, M., Repellin, J. -P., Rimoldi, A., Rothenberg, A. F., Roussarie, A., Ruhlmann, V., Sauvage, G., Schacher, J., Schlötelburg, M., Stocker, F., Swartz, M., Teiger, J., Tovey, S. N., Tsang, W. Y., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wunsch, M., Zaccone, H., and The UA2 Collaboration

Published
1986
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26. Measurement ofW ± andZ 0 properties at the CERN $$\bar pp$$ p collider

Author

Appel, J. A., Bagnaia, P., Banner, M., Battiston, R., Bernlöhr, K., Borer, K., Borghini, M., Carboni, G., Cavasinni, V., Cenci, P., Chollet, J. -C., Clark, A. G., Codino, A., Conta, C., Darriulat, P., De Lotto, B., Del Prete, T., Di Lella, L., Dines-Hansen, J., Einsweiler, K., Engelmann, R., Fayard, L., Fraternali, M., Froidevaux, D., Gaillard, J. -M., Gildemeister, O., Goggi, V. G., Gössling, C., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Harnew, N., Himel, T., Iconomidou-Fayard, L., Jakobs, K., Jenni, P., Kluge, E. E., Kofoed-Hansen, O., Lançon, E., Livan, M., Loucatos, S., Madsen, B., Mani, P., Mansoulié, B., Mantovani, G. C., Mapelli, L., Meier, K., Merkel, B., Möllerud, R., Moniez, M., Moning, R., Morganti, M., Nilsson, B., Onions, C., Parker, M. A., Parrour, G., Pastore, F., Pepe, M., Plothow-Besch, H., Polverel, M., Putzer, A., Repellin, J. -P., Rothenberg, A. F., Roussarie, A., Ruhlmann, V., Sauvage, G., Schacher, J., Schlötelburg, M., Stocker, F., Swartz, M., Teiger, J., Tittel, K., Tovey, S. N., Tsang, W. Y., Valdata-Nappi, M., Vercesi, V., Weidberg, A. R., Wunsch, M., Zaccone, H., and UA2 Collaboration

Published
1986
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27. A study of high transverse momentum electrons produced in $$\bar pp$$ collisions at 540 GeV

Author

Bagnaia, P., Banner, M., Battiston, R., Bloch, Ph., Bonaudi, F., Borer, K., Borghini, M., Burger, J., Cenci, P., Chollet, J. -C., Clark, A. G., Conta, C., Darriulat, P., Di Lella, L., Dines-Hansch, J., Dorsaz, P. A., Engelmann, R., Fayard, L., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. -M., Gildemeister, O., Goggi, V. G., Gössling, C., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Harnew, N., Himel, T., Hungerbühler, V., Jenni, P., Kofoed-Hansen, O., Lançon, E., Livan, M., Loucatos, S., Madsen, B., Mani, P., Mansoulié, B., Mantovani, G. C., Mapelli, L., Merkel, B., Möllerud, R., Nilsson, B., Onions, C., Parrour, G., Pastore, F., Plothow-Besch, H., Polverel, M., Repellin, J. -P., Rimoldi, A., Rothenberg, A., Roussarie, A., Sauvage, G., Schacher, J., Siegrist, J. L., Stimpfl, G., Stocker, F., Swartz, M., Teiger, J., Tovey, S., Vercesi, V., Weidberg, W. R., Zaccone, H., Zakrzewski, J. A., Zeller, W., and The AU2 Collaboration

Published
1984
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28. Measurement of production and properties of jets at the CERN $$\bar pp$$ collider

Author

Bagnaia, P., Banner, M., Battiston, R., Bloch, Ph., Bonaudi, F., Borer, K., Borghini, M., Chollet, J. -C., Clark, A. G., Conta, C., Darriulat, P., Di Lella, L., Dines-Hansen, J., Dorsaz, P. -A., Fayard, L., Fraternali, M., Froidevaux, D., Fumagalli, G., Gaillard, J. -M., Gildemeister, O., Goggi, V. G., Hahn, B., Hänni, H., Hansen, J. R., Hansen, P., Himel, T., Hungerbühler, V., Jenni, P., Kofoed-Hansen, O., Lançon, E., Livan, M., Loucatos, S., Madsen, B., Mani, P., Mansoulié, B., Mantovani, G. C., Mapelli, L., Merkel, B., Møllerud, R., Onions, C., Parrour, G., Psstore, F., Plothow-Besch, H., Polverel, M., Repellin, J. -P., Rimoldi, A., Rothenberg, A., Roussarie, A., Sauvage, G., Schacher, J., Siegrist, J. L., Steiner, H. M., Stimpfl, G., Stocker, F., Teiger, J., Vercesi, V., Weidberg, A., Zaccone, H., Zeller, W., and UA2 Collaboration

Published
1983
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29. Determination of $\pi\pi$ scattering lengths from measurement of $\pi^+\pi^-$ atom lifetime

Author

Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Chliapnikov, P. V., Ciocarlan, C., Constantinescu, S., Costantini, S., Curceanu, C., Doskarova, P., Dreossi, D., Drijard, D., Dudarev, A., Ferro-Luzzi, M., Pazos, J. L. Fungueiriño, Torreira, M. Gallas, Gerndt, J., Gianotti, P., Goldin, D., Gomez, F., Gorin, A., Gorchakov, O., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Hosek, R., Iliescu, M., Karpukhin, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Kruglov, V., Kruglova, L., Kulikov, A., Kuptsov, A., Kuroda, K. I., Lamberto, A., Lanaro, A., Lapshin, V., Lednicky, R., Leruste, P., Sandri, P. Levi, Aguera, A. Lopez, Lucherini, V., Maki, T., Manuilov, I., Marin, J., Narjoux, J. L., Nemenov, L., Nikitin, M., Pardo, T. Nunez, Okada, K., Olchevskii, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J. M., Plo, M., Ponta, T., Rappazzo, G. F., Riazantsev, A., Rodriguez, J. M., Fernandez, A. Rodriguez, Vidal, A. Romero, Ronjin, V. M., Rykalin, V., Saborido, J., Santamarina, C., Schacher, J., Schuetz, C., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M. J., Trojek, T., Trusov, S., Utkin, V., Doce, O. Vázquez, Vlachos, S., Voskresenskaya, O., Vrba, T., Willmott, C., Yazkov, V., Yoshimura, Y., Zhabitsky, M., and Zrelov, P.

Subjects
High Energy Physics - Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory., Comment: 6 pages, 6 figures

Published
2011

30. Determination of pi pi scattering lengths from measurement of pi(+)pi(-) atom lifetime

Author

Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Chliapnikov, P. V., Ciocarlan, C., Constantinescu, S., Costantini, S., Curceanu, C., Doskarova, P., Dreossi, D., Drijard, D., Dudarev, A., Ferro-Luzzi, M., Pazos, J. L. F., Torreira, M. G., Gerndt, J., Gianotti, P., Goldin, D., Gomez, F., Gorin, A., Gorchakov, O., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Hosek, R., Iliescu, M., Karpukhin, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Kruglov, V., Kruglova, L., Kulikov, A., Kuptsov, A., Kuroda, K. I., Lamberto, A., Lanaro, A., Lapshin, V., Lednicky, R., Leruste, P., Sandri, P. L., Aguera, A. L., Lucherini, V., Maki, T., Manuilov, I., Marin, J., Narjoux, J. L., Nemenov, L., Nikitin, M., Pardo, T. N., Okada, K., Olchevskii, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J. M., Plo, M., Ponta, T., Rappazzo, G. F., Riazantsev, A., Rodriguez, J. M., Fernandez, A. R., Vidal, A. R., Ronjin, V. M., Rykalin, V., Saborido, J., Santamarina, C., Schacher, J., Schuetz, C., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M. J., Trojek, T., Trusov, S., Utkin, V., Doce, O. V., Vlachos, S., Voskresenskaya, O., Vrba, T., Willmott, C., Yazkov, V., Yoshimura, Y., Zhabitsky, M., and Zrelov, P.

Subjects
pion scattering, probability, pionium, elementary atom, dirac experiment, pionium atom, cross-sections, qcd, target
Abstract

The DIRAC experiment at CERN has achieved a sizeable production of pi(+)pi(-) atoms and has significantly improved the precision on its lifetime determination. From a sample of 21 227 atomic pairs, a 4% measurement of the S-wave pi pi scattering length difference |a(0) - a(2)| = (0.2533(-0.0078)(+0.0080)|stat(-0.0073)(+0.0078)|syst)M(pi+)(-1) has been attained, providing an important test of Chiral Perturbation Theory. (C) 2011 Elsevier B.V. All rights reserved. Physics Letters B

Published
2011

32. HadAtom05, Workshop on Hadronic Atoms

Author

Afanasyev, L., Colangelo, G., and Schacher, J.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences
Abstract

These are the proceedings of the workshop "HadAtom05", held at the University of Bern, Switzerland, February 15 and 16, 2005. The main topics of the workshop concerned the physics of hadronic atoms, and in this context recent results from experiments and theory were presented. These proceedings contain the list of participants, the scientific program and a short contribution from each speaker., 28 pages, 5 figures, proceedings of the workshop "HadAtom05", University of Bern, Switzerland, February 15 and 16, 2005

Published
2005

33. 6th Workshop on Hadronic Atoms

Author

Colangelo, G, Schacher, J, and Afanasyev, L

Subjects
Particle Physics - Phenomenology
Abstract

These are the proceedings of the workshop "HadAtom05", held at the University of Bern, Switzerland, February 15 and 16, 2005. The main topics of the workshop concerned the physics of hadronic atoms, and in this context recent results from experiments and theory were presented. These proceedings contain the list of participants, the scientific program and a short contribution from each speaker.

Published
2005

34. First measurement of the $\pi^+\pi^-$ atom lifetime

Author

Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Constantinescu, S., Detraz, C., Dreossi, D., Drijard, D., Dudarev, A., Evangelou, I., Ferro-Luzzi, M., Gallas, M.V., Gerndt, J., Giacomich, R., Gianotti, P., Goldin, D., Gómez, F., Gorin, A., Gorchakov, O., Guaraldo, C., Hansroul, M., Hosek, R., Iliescu, M., Karpukhin, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Kruglov, V., Kruglova, L., Kulikov, A., Kuptsov, A., Kurochkin, I., Kuroda, K.-I., Lamberto, A., Lanaro, A., Lapshin, V., Lednicky, R., Leruste, P., Levi Sandri, P., Lopez Aguera, A., Lucherini, V., Maki, T., Manthos, N., Manuilov, I., Montanet, L., Narjoux, J.-L., Nemenov, L., Nikitin, M., Núñez Pardo, T., Okada, K., Olchevskii, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J.-M., Petrascu, C., Pló, M., Ponta, T., Pop, D., Rappazzo, G.F., Rodriguez Fernandez, A., Romero, A., Ryazantsev, A., Rykalin, V., Santamarina, C., Saborido, J., Schacher, J., Schuetz, Ch.P., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M.J., Trusov, S., Utkin, V., Vázquez Doce, O., Vázquez, P., Vlachos, S., Yazkov, V., Yoshimura, Y., Zhabitsky, M., Zrelov, P., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, European Organization for Nuclear Research (CERN), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (INFN, Sezione di Trieste), Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Frascati (LNF), and DIRAC

Subjects
pi(-) mesons, formalism, DIRAC experiment, scattering, Pion scattering, pionium, excitation, elementary atom, pionium atom, matter, High Energy Physics - Experiment, pion scattering, Elementary atom, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Pionium atom, spectrometer, 36.10.-k, 32.70.Cs, 25.80.E, 25.80.Gn, 29.30.Aj, dirac experiment, cross-sections, relativistic elementary atoms, energy
Abstract

The goal of the DIRAC experiment at CERN (PS212) is to measure the $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based on part of the collected data we present a first result on the lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss the major systematic errors. This lifetime corresponds to $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$., Comment: 18 pages, 6 figures

Published
2005
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35. Lifetime measurement of $\pi^{+}\pi^{-}$ and $\pi^{\pm} K^{\mp}$ atoms to test low energy QCD: Addendum to the DIRAC Proposal

Author

Adeva, B, Afanasiev, L G, Berka, Z, Brekhovskikh, V, Caragheorgheopol, G, Cechák, T, Chiba, M, Constantinescu, S, Drijard, Daniel, Dudarev, A, Détraz, C, Evangelou, I, Gallas, M V, Gerndt, J, Giacomich, R, Gianotti, P, Giardoni, M, Gorin, A, Gortchakov, O E, Guaraldo, C, Gómez, F, Hansroul, M, Hosek, R, Iliescu, M A, Jabitski, M, Karpukhin, V V, Kluson, J, Kobayashi, M, Kokkas, P, Komarov, V, Kruglov, V, Kruglova, L, Kulikov, A, Kuptsov, A, Kuroda, K I, Lamberto, A, Lanaro, A, Lapshin, V G, Lednicky, R, Levi-Sandri, P, Lucherini, V, Manthos, N, Nemenov, Leonid L, Nikitin, M, Okada, K, Olchevskii, V, Penescu, L, Pentia, M, Penzo, Aldo L, Petrascu, C, Pló, M, Pustylnik, Z P, Rappazzo, G F, Riazantsev, A, Romero, A, Rykalin, V I, Saborido, J, Santamarina-Rios, C, Schacher, J, Schütz, C P, Sidorov, A, Smolik, J, Takeutchi, F, Tarasov, A, Tauscher, L, Triantis, F A, Trusov, S V, Vlachos, S, Vázquez, P, Vázquez-Doce, O, Yazkov, V, Yoshimura, Y, Zhabitsky, V M, and Zrelov, V P

Subjects
Detectors and Experimental Techniques
Published
2004

36. HadAtom03

Author

Gasser, J., Rusetsky, A., and Schacher, J.

Subjects
High Energy Physics - Phenomenology
Abstract

These are the proceedings of the workshop "HadAtom03," held at the European Centre for Theoretical Nuclear Physics and Related Studies (ECT*), Trento (Italy), October 13 - 17, 2003. The main topics discussed at the workshop were the physics of hadronic atoms and in this context recent results in experiment and theory. Included here are the list of participants, the scientific program and a short contribution from each speaker., Comment: 46 pages, 16 postscript figures, Proceedings of the workshop "HadAtom03," 13-17 October Trento, Italy

Published
2004

37. Detection of pi(+)pi(-) atoms with the DIRAC spectrometer at CERN

Author

Adeva, B., Afanasyev, L., Benayoun, M., Benelli, A., Berka, Z., Brekhovskikh, V., Caragheorgheopol, G., Cechak, T., Chiba, M., Constantinescu, S., Costantini, S., Detraz, C., Dreossi, D., Drijard, D., Dudarev, A., Evangelou, I., Ferro-Luzzi, M., Gallas, M. V., Gerndt, J., Giacomich, R., Gianotti, P., Goldin, D., Gomez, F., Gorin, A., Gorchakov, O., Guaraldo, C., Hansroul, M., Hosek, R., Iliescu, M., Kalinina, N., Karpukhin, V., Kluson, J., Kobayashi, M., Kokkas, P., Komarov, V., Kruglov, V., Kruglova, L., Kulikov, A., Kuptsov, A., Kurochkin, I., Kuroda, K. I., Lamberto, A., Lanaro, A., Lapshin, V., Lednicky, R., Leruste, P., Sandri, P. L., Aguera, A. L., Lucherini, V., Maki, T., Manthos, N., Manuilov, I., Montanet, L., Narjoux, J. L., Nemenov, L., Nikitin, J., Pardo, T. N., Okada, K., Olchevskii, V., Pazos, A., Pentia, M., Penzo, A., Perreau, J. M., Petrascu, C., Plo, M., Ponta, T., Pop, D., Rappazzoo, G. F., Fernandez, A. R., Romero, A., Ryazantsev, A., Rykalin, V., Santamarina, C., Saborido, J., Schacher, J., Schuetz, C. P., Sidorov, A., Smolik, J., Takeutchi, F., Tarasov, A., Tauscher, L., Tobar, M. J., Trusov, S., Utkin, V., Doce, O. V., Vazquez, P., Vlachos, S., Yazkov, V., Yoshimura, Y., Zhabitsky, M., and Zrelov, P.

Subjects
state, pi(-) mesons, level trigger, scattering, high-energy, breakup, matter
Abstract

The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the pi(+)pi(-) atom (A(2pi)), which is of order 3 x 10(-15) s, and thus to determine the s-wave pipi-scattering lengths difference \a(0) - a(2)\. A(2pi) atoms are detected through the characteristic features of pi(+)pi(-) pairs from the atom break-up (ionization) in the target. We report on a first high statistics atomic data sample obtained from p-Ni interactions at 24 GeV/c proton momentum and present the methods to separate the signal from the background. Journal of Physics G-Nuclear and Particle Physics

Published
2004

38. HadAtom02

Author

Afanasyev, L., Lanaro, A., and Schacher, J.

Subjects
High Energy Physics - Phenomenology
Abstract

These are the proceedings of the workshop "HadAtom02", held at the CERN, October 14 - 15, 2002. The main topic of the workshop concerned the physics of hadronic atoms and in this contest recent results from experiments and theory were presented. These proceedings contain the list of participants, the scientific program and a short contribution from each speaker., Comment: 35 pages, 11 postscript figures

Published
2003

39. Experimental status of pionium at CERN

Author

Schacher, J. and Collaboration, DIRAC

Subjects
Nuclear physics, Physics, High Energy Physics - Phenomenology, Large Hadron Collider, High Energy Physics - Phenomenology (hep-ph), Physics::Atomic and Molecular Clusters, FOS: Physical sciences, Physics::Atomic Physics, Pionium, Particle Physics - Phenomenology
Abstract

The DIRAC Collaboration presents a first search for "atomic pi(+) pi(-) pairs" from ionization of pionium., 2 pages, LaTex, 2 figures, talk at Chiral Dynamics 2000, Newport News (USA), July 17-20, 2000

Published
2000

40. First observation of $\pi$K atom and its lifetime measurement

Author

Adeva, B, Afanasiev, L G, Berka, Z, Brekhovskikh, V, Caragheorgheopol, G, Cechák, T, Chiba, M, Costantini, S, Constantinescu, S, Détraz, C, Doudarev, A, Drijard, Daniel, Evangelou, I, Ferro-Luzzi, M, Gallas-Torreira, M V, Gerndt, J, Giacomich, R, Gianotti, P, Giardoni, M, Goldin, D, Gómez, F, Gorin, A, Gortchakov, O E, Guaraldo, C, Hansroul, M, Hosek, R, Iliescu, M A, Jabitski, M, Kalinina, N A, Karpoukhine, V, Kluson, J, Kobayashi, M, Kokkas, P, Komarov, V, Koulikov, A, Kouptsov, A, Krouglov, V, Krouglova, L, Kuroda, K I, Lamberto, A, Lanaro, A, Lapshin, V G, Lednicky, R, Levi-Sandri, P, López-Aguera, A, Lucherini, V, Mäki, T, Manuilov, I V, Manthos, N, Medinsky, M, Montanet, Lucien, Nemenov, L L, Nikitin, M, Okada, K, Olchevskii, V, Pentia, M, Penzo, Aldo L, Petrascu, C, Pló, M, Pop, D, Pustylnik, Z P, Rappazzo, G F, Riazantsev, A, Rodríguez, X M, Rodríguez-Fernández, A M, Rykalin, V I, Santamarina-Rios, C, Saborido, J, Schacher, J, Schütz, C, Sidorov, A, Smolik, J, Takeutchi, F, Tarasov, A, Tauscher, Ludwig, Tobar, M J, Triantis, F A, Trousov, S, Vlachos, S, Yazkov, V V, Yoshimura, Y, Zrelov, V P, and Ponta, T

Subjects
Detectors and Experimental Techniques
Published
2000

42. HadAtom99

Author

Gasser, J., Rusetsky, A., and Schacher, J.

Subjects
High Energy Physics - Phenomenology
Abstract

These are the proceedings of the workshop "HadAtom99", held at the Institut fuer Theoretische Physik, Universitaet Bern, October 14-15, 1999. The main topics discussed at the workshop were the physics of hadronic atoms and in this context recent results from Chiral Perturbation Theory. Included here are the program, the list of participants and a short summary provided by the speakers., Comment: 31 pages, LaTeX-file, 6 figures embedded, acknowledgments of funding organizations added

Published
1999

44. Charged pion production in fixed target Pb + Pb collisions at 158 GeV per nucleon

Author

Ambrosini, G., Arsenescu, R., Baglin, C., Beringer, J., Böhm, C., Borer, Kurt, Bussière, A., B. Dittus, F., Elsener, Konrad, Gorodetzky, P., Guillaud, J.P., O. Hess, P., Kabana, S., Klingenberg, R., Lindén, T., D. Lohmann, K., K. Mommsen, R., Moser, U., P. Pretzl, Klaus, Schacher, J., Selldén, B., Stoffel, F., Tuominiemi, Jorma, Weber, M., P. Zhang, Q., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and NA52

Subjects
Physics, Quantum chromodynamics, Particle physics, Phase transition, 010308 nuclear & particles physics, High Energy Physics::Lattice, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Strange matter, Pion, 0103 physical sciences, Coulomb, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, High Energy Physics::Experiment, Impact parameter, 010306 general physics, Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract

Changes in pion production as a function of the impact parameter of the collision or the incident energy, may reveal characteristics of a possible first-order phase transition from nuclear to quark matter, as predicted by lattice quantum chromodynamics. In this paper we investigate charged pion production in Pb+Pb collisions at 158 GeV/nucleon near 0° production angle and at forward rapidity $(4.3\leq y \leq 6.3)$. The centrality dependence of pion production is shown in the impact parameter range ~ 2-12 fm at the rapidities y = 5.7 and 6.3. An enhancement in the pi-/pi+ ratio has been measured near beam rapidity, indicating Coulomb interaction of charged pions with the spectator protons. The charged pion yield per nucleon participating in the collision (N_p) at y = 5.7 increases faster than linearly with N_p, up to N_p~100 and then it saturates, while at y = 6.3 it does not exhibit any sudden change as a function of N_p.

Published
1999
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45. International Workshop on Hadronic Atoms

Author

Rusetsky, A G, Schacher, J, and Gasser, J

Subjects
Particle Physics - Phenomenology
Abstract

These are the proceedings of the workshop "HadAtom99", held at the Institut fuer Theoretische Physik, Universitaet Bern, October 14-15, 1999. The main topics discussed at the workshop were the physics of hadronic atoms and in this context recent results from Chiral Perturbation Theory. Included here are the program, the list of participants and a short summary provided by the speakers.

Published
1999

46. Measurement of charged particle production from 450 GeV/c protons on beryllium

Author

Ambrosini, G., Arsenescu, R., Bernier, K., Biino, C., Bonesini, M., Bonivento, W., Borer, K., Brooijmans, G., Catanesi, M. G., Collazuol, G., Daniels, D., Dittus, F., Elsener, K., Godley, A., Grant, A., Gregoire, G., Guglielmi, A., Kabana, S., Klingenberg, R., Lehmann, G., Lindén, T., Linssen, L., Marchionni, A., Mishra, S. R., Moffitt, L., Moser, U., Palladino, V., Pietropaolo, F., Pretzl, K., Pullia, A., Radicioni, E., Ragazzi, S., Schacher, J., Sergiampietri, F., Soler, F. J. P., Stoffel, F., Tommaso Tabarelli de Fatis, Terranova, F., Tovey, S. N., Tsesmelis, E., and Weber, M.

Subjects
NEUTRINO OSCILLATIONS, SEARCH, TARGET
Published
1999

47. Baryon and antibaryon production in lead-lead collisions at 158 A GeV/c

Author

Ambrosini, G., Arsenescu, R., Baglin, C., Beringer, J., Bohm, C., Borer, K., Bussiere, A., Dittus, F., Elsener, K., Frei, D., Gorodetzky, P., Guillaud, J P., Hess, P., Hugentobler, E., Kabana, S., Klingenberg, R., Lindin, T., Lohmann, K D., Mommsen, R., Moser, U., Pal, T., Pretzl, K., Schacher, J., Sellden, B., Stoffel, F., Tuominiemi, J., Weber, M., Zhang, Q P., BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and NA52

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Particle Physics - Experiment
Published
1998

48. New results from NA52 on particle production in Pb+Pb collisions at 158 GeV per nucleon

Author

Kabana, S., Ambrosini, G., Arsenescu, R., Baglin, C., Beringer, J., Borer, K., Bussiere, A., Dittus, F., Elsener, K., Gerber, B., Gorodetzky, P., Guillaud, J P., Hess, P., Klingenberg, R., Linden, T., Lohmann, K D., Mommsen, R., Moser, U., Pretzl, K., Schacher, J., Stoffel, F., Tuominiemi, J., Weber, M., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), NA52, and BOMBAR, Claudine

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1997

49. Working group on $\pi\pi$ and $\pi$N interactions - Summary

Author

Meißner, Ulf-G., Sevior, Martin, Badertscher, A., Borasoy, B., Büttiker, P., Höhler, G., Knecht, M., Krehl, O., Lowe, J., Mojzis, M., Müller, G., Patarakin, O., Pavan, M., Rusetsky, A., Sainio, M. E., Schacher, J., Smith, G., Steininger, S., and Vereshagin, V.

Subjects
High Energy Physics - Phenomenology, Nuclear Theory
Abstract

This is the summary of the working group on $\pi\pi$ and $\pi$N interactions of the Chiral Dynamics Workshop in Mainz, September 1-5, 1997. Each talk is represented by an extended one page abstract. Some additional remarks by the convenors are added, Comment: 20 pp, LaTeX2e, uses epsf, 1 fig

Published
1997

50. Antinuclei production in Pb+Pb collisions at 158 GeV/c

Author

Appelquist, G., Baglin, C., Beringer, J., Bohm, C., Borer, K., Bussière, A., Dittus, F., Elsener, K., Frei, D., Gorodetzky, P., P. Guillaud, J., Hugentobler, E., Klingenberg, R., Linden, T., D. Lohmann, K., Moser, U., Pal, T., Pretzl, K., Schacher, J., Selldén, B., Stoffel, F., Tuominiemi, J., P. Zhang, Q., Heyd, Yvette, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA52

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1996

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