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Measurement of the beam spin asymmetry of (e)over-right-arrowp -> e ' p 'eta ' in the deep-inelastic regime with CLAS

Author:
Zhao, B.  Kim, A.  Joo, K.  Bedlinskiy, I  Kim, W.  Kubarovsky, V  Ungaro, M.  Adhikari, S.  Akbar, Z.  Angelini, G.  Avakian, H.  Ball, J.  Baltzell, N. A.  Barion, L.  Bashkanov, M.  Battaglieri, M.  Batourine, V  Biselli, A. S.  Boiarinov, S.  Briscoe, W. J.  Brooks, W. K.  Burkert, V. D.  Carman, D. S.  Celentano, A.  Chatagnon, R.  Chetry, T.  Ciullo, G.  Clark, L.  Clary, B. A.  Cole, P. L.  Contalbrigo, M.  Crede, V  D'Angelo, A.  Dashyan, N.  De Vita, R.  De Sanctis, E.  Defurne, M.  Deur, A.  Diehl, S.  Djalali, C.  Dupre, R.  Egiyan, H.  Ehrhart, M.  El Alaoui, A.  El Fassi, L.  Eugenio, R.  Filippi, A.  Forest, T. A.  Gavalian, G.  Ghandilyan, Y.  Gilfoyle, G. P.  Girod, F. X.  Golovatch, E.  Gothe, R. W.  Griffioen, K. A.  Guidal, M.  Guo, L.  Hafidi, K.  Hakobyan, H.  Harrison, N.  Hattawy, M.  Heddle, D.  Hicks, K.  Holtrop, M.  Ilieva, Y.  Ireland, D. G.  Ishkhanov, B. S.  Isupov, E. L.  Jenkins, D.  Jo, H. S.  Johnston, S.  Kabir, M. L.  Keller, D.  Khachatryan, G.  Khachatryana, M.  Khandaker, M.  Klein, A.  Klein, F. J.  Kuhn, S. E.  Kuleshov, S., V  Lanza, L.  Lenisa, R.  Livingston, K.  MacGregor, I. J. D.  Marchand, D.  Markov, N.  McKinnon, B.  Meyer, C. A.  Meziani, Z. E.  Mirazita, M.  Mokeev, V  Montgomery, R. A.  Camacho, C. Munoz  Nadel-Turonski, R.  Niccolai, S.  Niculescu, G.  Osipenko, M.  Ostrovidov, A., I  Paolone, M.  Paremuzyan, R.  Parke, K.  Pogorelko, O.  Price, J. W.  Prok, Y.  Protopopescu, D.  Ripani, M.  Rizzo, A.  Rosner, G.  Rossi, P.  Sabatie, F.  Salgado, C.  Schumacher, R. A.  Sharabian, Y. G.  Skorodumina, Iu  Smith, G. D.  Sokhan, D.  Sparveris, N.  Stepanyan, S.  Strakovsky, I  Strauch, S.  Taiuti, M.  Tan, J. A.  Voskanyan, H.  Voutier, E.  Wang, R.  Wei, X.  Wood, M. H.  Zachariou, N.  Zhang, J.  Zhao, Z. W.  


Journal:
PHYSICS LETTERS B


Issue Date:
2019


Abstract(summary):

The beam spin asymmetry of the exclusive pseudoscalar channel (e) over right arrowp -> e'p'eta was measured for the first time in the deep-inelastic regime (W > 2 GeV/c(2) and Q(2) > 1 GeV2/c(2)) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q(2), chi(B), -t and phi over a wide kinematic range, where phi is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin phi moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations. (C) 2019 The Authors. Published by Elsevier B.V.


Page:
426---431


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