Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS

Zhao, B. (University of Connecticut, Storrs, CT, 06269, United States of America) (College of William and Mary, Williamsburg, VA, 23187-8795, United States of America) ; Kim, A.  (University of Connecticut, Storrs, CT, 06269, United States of America) ; Joo, K. (University of Connecticut, Storrs, CT, 06269, United States of America) ; Bedlinskiy, I. (Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia) ; Kim, W. (Kyungpook National University, Daegu, 41566, Republic of Korea) ; Kubarovsky, V. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (Rensselaer Polytechnic Institute, Troy, NY, 12180-3590, United States of America) ; Ungaro, M. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Adhikari, S. (Florida International University, Miami, FL, 33199, United States of America) ; Akbar, Z. (Florida State University, Tallahassee, FL, 32306, United States of America) ; Angelini, G. (The George Washington University, Washington, DC, 20052, United States of America) ; Avakian, H. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Ball, J. (IRFU, CEA, Universit'e Paris-Saclay, Gif-sur-Yvette, F-91191, France) ; Baltzell, N.A. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (University of South Carolina, Columbia, SC, 29208, United States of America) ; Barion, L. (INFN, Sezione di Ferrara, Ferrara, 44100, Italy) ; Bashkanov, M. (Edinburgh University, Edinburgh, EH9 3JZ, United Kingdom) ; Battaglieri, M. (INFN, Sezione di Genova, Genova, 16146, Italy) ; Batourine, V. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (Kyungpook National University, Daegu, 41566, Republic of Korea) ; Biselli, A.S. (Fairfield University, Fairfield, CT, 06824, United States of America) (Carnegie Mellon University, Pittsburgh, PA, 15213, United States of America) ; Boiarinov, S. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Briscoe, W.J. (The George Washington University, Washington, DC, 20052, United States of America) ; Brooks, W.K. (Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile) (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Burkert, V.D. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Carman, D.S. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Celentano, A. (INFN, Sezione di Genova, Genova, 16146, Italy) ; Chatagnon, P. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Chetry, T. (Ohio University, Athens, OH, 45701, United States of America) ; Ciullo, G. (INFN, Sezione di Ferrara, Ferrara, 44100, Italy) (Universita' di Ferrara, Ferrara, 44121, Italy) ; Clark, L. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Clary, B.A. (University of Connecticut, Storrs, CT, 06269, United States of America) ; Cole, P.L. (Idaho State University, Pocatello, ID, 83209, United States of America) ; Contalbrigo, M. (INFN, Sezione di Ferrara, Ferrara, 44100, Italy) ; Crede, V. (Florida State University, Tallahassee, FL, 32306, United States of America) ; D'Angelo, A. (INFN, Sezione di Roma Tor Vergata, Rome, 00133, Italy) (Universita' di Roma Tor Vergata, Rome, 00133, Italy) ; Dashyan, N. (Yerevan Physics Institute, Yerevan, 375036, Armenia) ; De Vita, R. (INFN, Sezione di Genova, Genova, 16146, Italy) ; De Sanctis, E. (INFN, Laboratori Nazionali di Frascati, Frascati, 00044, Italy) ; Defurne, M. (IRFU, CEA, Universit'e Paris-Saclay, Gif-sur-Yvette, F-91191, France) ; Deur, A. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Diehl, S. (University of Connecticut, Storrs, CT, 06269, United States of America) ; Djalali, C. (University of South Carolina, Columbia, SC, 29208, United States of America) ; Dupre, R. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Egiyan, H. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (University of New Hampshire, Durham, NH, 03824-3568, United States of America) ; Ehrhart, M. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; El Alaoui, A. (Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile) ; El Fassi, L. (Mississippi State University, Mississippi State, MS, 39762-5167, United States of America) ; Eugenio, P. (Florida State University, Tallahassee, FL, 32306, United States of America) ; Filippi, A. (INFN, Sezione di Torino, Torino, 10125, Italy) ; Forest, T.A. (Idaho State University, Pocatello, ID, 83209, United States of America) ; Gavalian, G. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (Old Dominion University, Norfolk, VA, 23529, United States of America) ; Ghandilyan, Y. (Yerevan Physics Institute, Yerevan, 375036, Armenia) ; Gilfoyle, G.P. (University of Richmond, Richmond, VA, 23173, United States of America) ; Girod, F.X. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (IRFU, CEA, Universit'e Paris-Saclay, Gif-sur-Yvette, F-91191, France) ; Golovatch, E. (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119234, Russia) ; Gothe, R.W. (University of South Carolina, Columbia, SC, 29208, United States of America) ; Griffioen, K.A. (College of William and Mary, Williamsburg, VA, 23187-8795, United States of America) ; Guidal, M. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Guo, L. (Florida International University, Miami, FL, 33199, United States of America) (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Hafidi, K. (Argonne National Laboratory, Argonne, IL, 60439, United States of America) ; Hakobyan, H. (Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile) (Yerevan Physics Institute, Yerevan, 375036, Armenia) ; Harrison, N. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Hattawy, M. (Argonne National Laboratory, Argonne, IL, 60439, United States of America) ; Heddle, D. (Christopher Newport University, Newport News, VA, 23606, United States of America) (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Hicks, K. (Ohio University, Athens, OH, 45701, United States of America) ; Holtrop, M. (University of New Hampshire, Durham, NH, 03824-3568, United States of America) ; Ilieva, Y. (University of South Carolina, Columbia, SC, 29208, United States of America) (The George Washington University, Washington, DC, 20052, United States of America) ; Ireland, D.G. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Ishkhanov, B.S. (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119234, Russia) ; Isupov, E.L. (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119234, Russia) ; Jenkins, D. (Virginia Tech, Blacksburg, VA, 24061-0435, United States of America) ; Jo, H.S. (Kyungpook National University, Daegu, 41566, Republic of Korea) (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Johnston, S. (Argonne National Laboratory, Argonne, IL, 60439, United States of America) ; Kabir, M.L. (Mississippi State University, Mississippi State, MS, 39762-5167, United States of America) ; Keller, D. (University of Virginia, Charlottesville, VA, 22901, United States of America) ; Khachatryan, G. (Yerevan Physics Institute, Yerevan, 375036, Armenia) ; Khachatryan, M. (Old Dominion University, Norfolk, VA, 23529, United States of America) ; Khandaker, M. (Norfolk State University, Norfolk, VA, 23504, United States of America) ; Klein, A. (Old Dominion University, Norfolk, VA, 23529, United States of America) ; Klein, F.J. (Catholic University of America, Washington, DC, 20064, United States of America) ; Kuhn, S.E. (Old Dominion University, Norfolk, VA, 23529, United States of America) ; Kuleshov, S.V. (Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile) (Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia) ; Lanza, L. (INFN, Sezione di Roma Tor Vergata, Rome, 00133, Italy) ; Lenisa, P. (INFN, Sezione di Ferrara, Ferrara, 44100, Italy) ; Livingston, K. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; MacGregor, I.J.D. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Marchand, D. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Markov, N. (University of Connecticut, Storrs, CT, 06269, United States of America) ; McKinnon, B. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Meyer, C.A. (Carnegie Mellon University, Pittsburgh, PA, 15213, United States of America) ; Meziani, Z.E. (Temple University, Philadelphia, PA, 19122, United States of America) ; Mirazita, M. (INFN, Laboratori Nazionali di Frascati, Frascati, 00044, Italy) ; Mokeev, V. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119234, Russia) ; Montgomery, R.A. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Munoz Camacho, C. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Nadel-Turonski, P. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (The George Washington University, Washington, DC, 20052, United States of America) ; Niccolai, S. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Niculescu, G. (James Madison University, Harrisonburg, VA, 22807, United States of America) ; Osipenko, M. (INFN, Sezione di Genova, Genova, 16146, Italy) ; Ostrovidov, A.I. (Florida State University, Tallahassee, FL, 32306, United States of America) ; Paolone, M. (Temple University, Philadelphia, PA, 19122, United States of America) ; Paremuzyan, R. (University of New Hampshire, Durham, NH, 03824-3568, United States of America) ; Park, K. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (Kyungpook National University, Daegu, 41566, Republic of Korea) ; Pogorelko, O. (Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia) ; Price, J.W. (California State University, Dominguez Hills, Carson, CA, 90747, United States of America) ; Prok, Y. (Old Dominion University, Norfolk, VA, 23529, United States of America) (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Protopopescu, D. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Ripani, M. (INFN, Sezione di Genova, Genova, 16146, Italy) ; Rizzo, A. (INFN, Sezione di Roma Tor Vergata, Rome, 00133, Italy) (Universita' di Roma Tor Vergata, Rome, 00133, Italy) ; Rosner, G. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Rossi, P. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) (INFN, Laboratori Nazionali di Frascati, Frascati, 00044, Italy) ; Sabatié, F. (IRFU, CEA, Universit'e Paris-Saclay, Gif-sur-Yvette, F-91191, France) ; Salgado, C. (Norfolk State University, Norfolk, VA, 23504, United States of America) ; Schumacher, R.A. (Carnegie Mellon University, Pittsburgh, PA, 15213, United States of America) ; Sharabian, Y.G. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Skorodumina, Iu. (University of South Carolina, Columbia, SC, 29208, United States of America) (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119234, Russia) ; Smith, G.D. (Edinburgh University, Edinburgh, EH9 3JZ, United Kingdom) ; Sokhan, D. (University of Glasgow, Glasgow, G12 8QQ, United Kingdom) ; Sparveris, N. (Temple University, Philadelphia, PA, 19122, United States of America) ; Stepanyan, S. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Strakovsky, I.I. (The George Washington University, Washington, DC, 20052, United States of America) ; Strauch, S. (University of South Carolina, Columbia, SC, 29208, United States of America) (The George Washington University, Washington, DC, 20052, United States of America) ; Taiuti, M. (Università di Genova, Genova, 16146, Italy) ; Tan, J.A. (Kyungpook National University, Daegu, 41566, Republic of Korea) ; Voskanyan, H. (Yerevan Physics Institute, Yerevan, 375036, Armenia) ; Voutier, E. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Wang, R. (Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris Sud, Orsay, France) ; Wei, X. (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, United States of America) ; Wood, M.H. (Canisius College, Buffalo, NY, United States of America) (University of South Carolina, Columbia, SC, 29208, United States of America) ; Zachariou, N. (Edinburgh University, Edinburgh, EH9 3JZ, United Kingdom) ; Zhang, J. (University of Virginia, Charlottesville, VA, 22901, United States of America) (Old Dominion University, Norfolk, VA, 23529, United States of America) ; Zhao, Z.W. (Duke University, Durham, NC, 27708-0305, United States of America)

03 January 2019

Abstract: The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime ( W>2 GeV/c2 and Q2>1 GeV2/c2 ) 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 Q2 , xB , − t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ 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.


Published in: Physics letters B 789 (2019) 426-431
Published by: Elsevier
DOI: 10.1016/j.physletb.2018.12.065
License: CC-BY-3.0



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