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Extraction of Beam-Spin Asymmetries from the Hard Exclusive Π^+ Channel off Protons in a Wide Range of Kinematics

S. Diehl,K. Joo,A. Kim,H. Avakian,P. Kroll, K. Park,D. Riser,K. Semenov-Tian-Shansky,K. Tezgin,K. P. Adhikari,S. Adhikari,M. J. Amaryan,G. Angelini,G. Asryan,H. Atac,L. Barion,M. Battaglieri,I Bedlinskiy,F. Benmokhtar,A. Bianconi,A. S. Biselli, F. Bossu, S. Boiarinov,W. J. Briscoe, W. K. Brooks,D. Bulumulla,V. D. Burkert,D. S. Carman,J. C. Carvajal,A. Celentano,P. Chatagnon,T. Chetry,G. Ciullo,L. Clark,P. L. Cole,M. Contalbrigo,V Crede,A. D'Angelo,N. Dashyan,R. De Vita,M. Defurne,A. Deur,C. Dilks,C. Djalali,R. Dupre,H. Egiyan,M. Ehrhart,A. El Alaoui,L. El Fassi,P. Eugenio,A. Filippi,T. A. Forest,Y. Ghandilyan,G. P. Gilfoyle,K. L. Giovanetti,F. X. Girod,D. Glazier,E. Golovatch,R. W. Gothe,K. A. Griffioen,M. Guidal,L. Guo,H. Hakobyan,N. Harrison,M. Hattawy,T. B. Hayward,D. Heddle,K. Hicks,M. Holtrop,Y. Ilieva,D. G. Ireland,B. S. Ishkhanov,E. L. Isupov,D. Jenkins,H. S. Jo,S. Joosten,D. Keller,M. Khachatryan,A. Khanal,M. Khandaker,C. W. Kim,W. Kim,V Kubarovsky,S. E. Kuhn,L. Lanza,M. Leali, P. Lenisa,K. Livingston,I. J. D. MacGregor,D. Marchand,N. Markov,L. Marsicano,V Mascagna,B. McKinnon,Z. E. Meziani,T. Mineeva,M. Mirazita,V Mokeev,C. Munoz Camacho,P. Nadel-Turonski,G. Niculescu,M. Osipenko,M. Paolone,L. L. Pappalardo,E. Pasyuk,W. Phelps,O. Pogorelko,J. W. Price,Y. Prok,B. A. Raue,M. Ripani,A. Rizzo,P. Rossi,J. Rowley,F. Sabatie,C. Salgado,A. Schmidt,R. A. Schumacher,Y. G. Sharabian,U. Shrestha,O. Soto,N. Sparveris,S. Stepanyan,P. Stoler,I. I. Strakovsky,S. Strauch,J. A. Tan,N. Tyler,M. Ungaro,L. Venturelli,H. Voskanyan,E. Voutier,D. P. Watts,X. Wei,M. H. Wood,N. Zachariou, J. Zhang,Z. W. Zhao

Physical review letters(2020)

引用 17|浏览93
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摘要
We have measured beam-spin asymmetries to extract the sinϕ moment A_{LU}^{sinϕ} from the hard exclusive e[over →]p→e^{'}nπ^{+} reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The A_{LU}^{sinϕ} moment has been measured up to 6.6  GeV^{2} in -t, covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found A_{LU}^{sinϕ} to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.
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