Exclusive φ 0 muoproduction on transversely polarised protons and deuterons

C. Adolph, M. G. Alekseev, V. Yu Alexakhin, Yu Alexandrov, 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, R. Birsa, J. BisplinghoffP. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Dalla Torre, S. Das, S. S. Dasgupta, S. Dasgupta, O. Yu Denisov, L. Dhara, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, 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, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, F. H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch Höppner, N. d'Hose, S. Ishimoto, O. Ivanov, Yu Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, Yu Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, 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, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, A. Magnon, N. Makke, G. K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu V. Mikhailov, 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. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, J. F. Rajotte, S. Ramos, 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, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, L. Schmitt, K. Schönning, S. Schopferer, M. Schott, W. Schröder, O. Yu Shevchenko, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, N. V. Vlassov, L. Wang, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, N. Zhuravlev, A. Zvyagin

Research output: Contribution to journalArticlepeer-review

Abstract

The transverse target spin azimuthal asymmetry AUTsin(φ-φS) in hard exclusive production of ρ 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 Bj and pT2 dependence of AUTsin(φ-φS) is presented in a wide kinematic range: 1(GeV/c) 2<Q 2<10(GeV/c) 2, 0.003<x Bj<0.3 and 0.05(GeV/c)2<pT2<0.5(GeV/c)2 for protons or 0.10(GeV/c)2<pT2<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.

Original languageEnglish
Pages (from-to)1-20
Number of pages20
JournalNuclear Physics B
Volume865
Issue number1
DOIs
StatePublished - 1 Dec 2012

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