Exclusive ω meson muoproduction on transversely polarised protons

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev,G.D. Alexeev,A. Amoroso,V. Andrieux,N.V. Anfimov,V. Anosov,W. Augustyniak,A. Austregesilo,C.D.R. Azevedo,B. Badełek,F. Balestra,J. Barth, R. Beck,Y. Bedfer,J. Bernhard, K. Bicker, E.R. Bielert,R. Birsa,J. Bisplinghoff,M. Bodlak,M. Boer,P. Bordalo,F. Bradamante,C. Braun,A. Bressan,M. Büchele,W.-C. Chang,C. Chatterjee,M. Chiosso,I. Choi, S.-U. Chung,A. Cicuttin,M.L. Crespo,Q. Curiel,S. Dalla Torre,S.S. Dasgupta,S. Dasgupta,O.Yu. Denisov,L. Dhara,S.V. Donskov,N. Doshita,V. Duic,W. Dünnweber,M. Dziewiecki,A. Efremov, P.D. Eversheim,W. Eyrich,M. Faessler,A. Ferrero,M. Finger,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J.M. Friedrich,V. Frolov,E. Fuchey,F. Gautheron,O.P. Gavrichtchouk,S. Gerassimov,F. Giordano,I. Gnesi,M. Gorzellik, S. Grabmüller, A. Grasso,M. Grosse Perdekamp,B. Grube, T. Grussenmeyer,A. Guskov,F. Haas,D. Hahne,D. von Harrach,R. Hashimoto,F.H. Heinsius,R. Heitz,F. Herrmann,F. Hinterberger,N. Horikawa,N. d'Hose, C.-Y. Hsieh,S. Huber,S. Ishimoto,A. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn, V. Jary,R. Joosten,P. Jörg,E. Kabuß,B. Ketzer, G.V. Khaustov,Yu.A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,J.H. Koivuniemi,V.N. Kolosov,K. Kondo, K. Königsmann,I. Konorov,V.F. Konstantinov,A.M. Kotzinian,O.M. Kouznetsov,M. Krämer, P. Kremser,F. Krinner, Z.V. Kroumchtein,Y. Kulinich,F. Kunne, K. Kurek,R.P. Kurjata, A.A. Lednev,A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian,J. Lichtenstadt,R. Longo,A. Maggiora,A. Magnon, N. Makins,N. Makke,G.K. Mallot,C. Marchand, B. Marianski,A. Martin,J. Marzec,J. Matoušek,H. Matsuda,T. Matsuda, G.V. Meshcheryakov,M. Meyer,W. Meyer,T. Michigami,Yu.V. Mikhailov,M. Mikhasenko,E. Mitrofanov,N. Mitrofanov,Y. Miyachi,P. Montuenga,A. Nagaytsev, F. Nerling,D. Neyret, V.I. Nikolaenko,J. Nový,W.-D. Nowak,G. Nukazuka,A.S. Nunes, A.G. Olshevsky,I. Orlov,M. Ostrick,D. Panzieri,B. Parsamyan,S. Paul,J.-C. Peng,F. Pereira,M. Pešek, D.V. Peshekhonov,N. Pierre,S. Platchkov,J. Pochodzalla,V.A. Polyakov,J. Pretz,M. Quaresma,C. Quintans,S. Ramos, C. Regali, G. Reicherz,C. Riedl,M. Roskot, D.I. Ryabchikov,A. Rybnikov,A. Rychter, R. Salac,V.D. Samoylenko,A. Sandacz,C. Santos,S. Sarkar, I.A. Savin,T. Sawada,G. Sbrizzai,P. Schiavon,K. Schmidt, H. Schmieden,K. Schönning,S. Schopferer,E. Seder,A. Selyunin,O.Yu. Shevchenko,L. Silva,L. Sinha, S. Sirtl,M. Slunecka,J. Smolik,F. Sozzi,A. Srnka,D. Steffen,M. Stolarski,M. Sulc,H. Suzuki,A. Szabelski, T. Szameitat,P. Sznajder,S. Takekawa,M. Tasevsky,S. Tessaro,F. Tessarotto, F. Thibaud,F. Tosello,V. Tskhay,S. Uhl,J. Veloso,M. Virius, J. Vondra,S. Wallner, T. Weisrock,M. Wilfert,J. ter Wolbeek,K. Zaremba,P. Zavada,M. Zavertyaev,E. Zemlyanichkina,M. Ziembicki,A. Zink

NUCLEAR PHYSICS B（2017）

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摘要

Exclusive production of omega mesons was studied at the COMPASS experiment by scattering 160GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1(GeV/c)(2) < Q(2) < 10(GeV/c)(2), Bjorken scaling variable 0.003 < xBj < 0.3 and transverse momentum squared of the omega meson 0.05(GeV/c)(2) < p(T)(2) < 0.5(GeV/c)(2). The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) Et hat are related to the orbital angular momentum of quarks, the chiral-odd GPDs H-T that are related to the transversity Parton Distribution Functions, and the sign of the pi omega transition form factor. The results are compared to recent calculations of a GPD-based model. (C) 2016 The Author(s). Published by Elsevier B.V.

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