Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering

A. Airapetian,N. Akopov,Z. Akopov,M. Amarian,E. C. Aschenauer,W. Augustyniak,R. Avakian,A. Avetissian,E. Avetisyan,B. Ball,S. Belostotski,N. Bianchi,H. P. Blok,H. Böttcher,A. Borissov,J. Bowles,V. Bryzgalov,J. Burns,M. Capiluppi,G. P. Capitani,E. Cisbani,G. Ciullo,M. Contalbrigo,P. F. Dalpiaz,W. Deconinck,R. De Leo,L. De Nardo,E. De Sanctis,M. Diefenthaler,P. Di Nezza,M. Düren,M. Ehrenfried,G. Elbakian,F. Ellinghaus, R. Fabbri,A. Fantoni,L. Felawka,S. Frullani,D. Gabbert,G. Gapienko,V. Gapienko,F. Garibaldi,G. Gavrilov,V. Gharibyan,F. Giordano,S. Gliske,H. Guler,V. Guzey,S. Haan, C. Hadjidakis,M. Hartig,D. Hasch,G. Hill,A. Hillenbrand,M. Hoek,Y. Holler, I. Hristova,Y. Imazu,A. Ivanilov,H. E. Jackson,H. S. Jo,S. Joosten,R. Kaiser,G. Karyan,T. Keri, E. Kinney,A. Kisselev,V. Korotkov,V. Kozlov,P. Kravchenko,L. Lagamba,R. Lamb,L. Lapikás,I. Lehmann,P. Lenisa,A. López Ruiz,W. Lorenzon,X.-G. Lu,X.-R. Lu,B.-Q. Ma,D. Mahon,N. C. R. Makins,S. I. Manaenkov,L. Manfré,Y. Mao,B. Marianski,A. Martinez de la Ossa,H. Marukyan,C. A. Miller,Y. Miyachi,A. Movsisyan, V. Muccifora,M. Murray,A. Mussgiller,E. Nappi,Y. Naryshkin,A. Nass,M. Negodaev,W.-D. Nowak,L. L. Pappalardo,R. Perez-Benito,M. Raithel,P. E. Reimer,A. R. Reolon,C. Riedl,K. Rith,G. Rosner,A. Rostomyan,J. Rubin, D. Ryckbosch,Y. Salomatin, A. Schäfer,G. Schnell,K. P. Schüler,R. Shanidze,T.-A. Shibata,V. Shutov,M. Stancari,M. Statera,E. Steffens,J. J. M. Steijger,J. Stewart,F. Stinzing,S. Taroian,A. Terkulov,A. Trzcinski,M. Tytgat,A. Vandenbroucke,Y. Van Haarlem,C. Van Hulse,M. Varanda,D. Veretennikov,V. Vikhrov,I. Vilardi,S. Wang,S. Yaschenko,H. Ye,Z. Ye,W. Yu,D. Zeiler,B. Zihlmann,P. Zupranski

PHYSICAL REVIEW C（2010）

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摘要

The nuclear-mass dependence of azimuthal cross-section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studied for hard exclusive electroproduction of real photons. The observed beam-charge and beam-helicity asymmetries are attributed to the interference between the Bethe-Heitler and the deeply virtual Compton scattering processes. For various nuclei, the asymmetries are extracted for both coherent and incoherent-enriched regions, which involve different (combinations of) generalized parton distributions. For both regions, the asymmetries are compared to those for a free proton, and no nuclear-mass dependence is found.

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