Exclusive muoproduction on transversely polarised protons and deuterons

C. Adolph, M.G. Alekseev,V.Yu. Alexakhin,Yu. Alexandrov, G. D. Alexeev,A. Amoroso,Alexey Antonov,A. Austregesilo, B. Badelek, F. Balestra, J. Barth,Günter Baum, Y. Bedfer,Johannes Bernhard,R. Bertini, M. Bettinelli, K. Bicker, J. Bieling,R. Birsa, J. Bisplinghoff,P. Bordalo,Franco Bradamante,C. Braun,A. Bravar,Andrea Bressan, M. Büchele,E. Burtin, L. Capozza, M. Chiosso, S.-U. Chung,Andres Cicuttin,Maria Liz Crespo,S. Dalla Torre,S. Das, S.S. Dasgupta, S. Dasgupta,O.Yu. Denisov,L. Dhara,Sergey Donskov,Norihiro Doshita,V. Duic, W. Dünnweber,Michal Dziewiecki,A.V. Efremov,C. Elia, P.D. Eversheim, W. Eyrich, M. A. Faessler,Andrea Ferrero,A. Filin,M. Finger,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J.M. Friedrich,V. Frolov, R. Garfagnini,Fabrice 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,François Herrmann,C. Heß,F. Hinterberger,N. Horikawa,Ch. Höppner,N. dʼHose,S. Ishimoto,Oleg V. Ivanov,Yu. Ivanshin,Takahiro Iwata,R. Jahn,V. Jary,P. Jasinski, G. Jegou, R. Joosten,E. M. Kabuß,D. Kang,B. Ketzer,G.V. Khaustov,Yu.A. Khokhlov,Yu. Kisselev,Frank Klein,K. Klimaszewski,S. Koblitz,J.H. Koivuniemi, V.N. Kolosov,K. Kondo, K. Königsmann,I. Konorov,V.F. Konstantinov,A. Korzenev,Aram Kotzinian,O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, F. Kunne, K. Kurek, L. Lauser, A.A. Lednev,A. Lehmann,S. Levorato,J. Lichtenstadt,T. Liška, A. Maggiora, A. Magnon,Nour Makke,Gerhard K. Mallot, A. Mann,C. Marchand,Anne-Laure Martin,J. Marzec,T. Matsuda, G.V. Meshcheryakov, W. Meyer, T. Michigami,Yu.V. Mikhailov,Murray Moinester, A. Morreale, A. Mutter, A. Nagaytsev,T. Nagel, T. Negrini, F. Nerling,S. Neubert,D. Neyret, Vladimir Nikolaenko,W.-D. Nowak,A.S. Nunes, A.G. Olshevsky,M. Ostrick,A. Padee, R. Panknin, D. Panzieri,Bakur Parsamyan,Soumen 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, Jean-Francois Rajotte,S. Ramos, V. Rapatsky, G. Reicherz, Achim 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,Christian Schill,T. Schlüter,K. Schmidt,L. Schmitt,K. Schönning, S. Schopferer,Matthias Schott, W. Schröder,O.Yu. Shevchenko,Laura Silva,L. Sinha, A. N. Sissakian,M. Slunecka, G.I. Smirnov, S. Sosio, Federica Sozzi,A. Srnka,L. Steiger,M. Stolarski,Miroslav Sulc,R. Sulej, H. Suzuki,P. Sznajder,S. Takekawa,J. ter Wolbeek,S. Tessaro,F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman,Maxence Vandenbroucke,M. Virius, N.V. Vlassov, L. Wang, M. Wilfert, R. Windmolders,W. Wislicki, H. Wollny,K. Zaremba,M. V. Zavertyaev, E. Zemlyanichkina,M. Ziembicki, N. I. Zhuravlev,A. Zvyagin

Nuclear Physics B(2012)

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摘要
The transverse target spin azimuthal asymmetry A_UT 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 and p_t^2 dependence of A_UT is presented in a wide kinematic range. 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.
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