Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions
Journal
Physical Review Letters
Date Issued
2015-11-17
Author(s)
Jo, H. S.
Girod, F. X.
Avakian, H.
Burkert, V. D.
Garçon, M.
Guidal, M.
Kubarovsky, V.
Niccolai, S.
Stoler, P.
Adhikari, K. P.
Adikaram, D.
Amaryan, M. J.
Anderson, M. D.
Anefalos Pereira, S.
Ball, J.
Baltzell, N. A.
Battaglieri, M.
Batourine, V.
Bedlinskiy, I.
Biselli, A. S.
Boiarinov, S.
Briscoe, W. J.
Carman, D. S.
Celentano, A.
Chandavar, S.
Charles, G.
Colaneri, L.
Cole, P. L.
Compton, N.
Contalbrigo, M.
Crede, V.
D'Angelo, A.
Dashyan, N.
De Vita, R.
De Sanctis, E.
Deur, A.
Djalali, C.
Dupre, R.
Fassi, L. El
Elouadrhiri, L.
Fedotov, G.
Fegan, S.
Filippi, A.
Fleming, J. A.
Garillon, B.
Gevorgyan, N.
Ghandilyan, Y.
Gilfoyle, G. P.
Giovanetti, K. L.
Goetz, J. T.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guegan, B.
Guler, N.
Guo, L.
Hafidi, K.
Harrison, N.
Hattawy, M.
Hicks, K.
Hirlinger Saylor, N.
Ho, D.
Holtrop, M.
Hughes, S. M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Jenkins, D.
Joo, K.
Joosten, S.
Keller, D.
Khachatryan, G.
Khandaker, M.
Kim, A.
Kim, W.
Klein, A.
Klein, F. J.
Kuhn, S. E.
Lenisa, P.
Livingston, K.
Lu, H. Y.
Macgregor, I. J.D.
McKinnon, B.
Meziani, Z. E.
Mirazita, M.
Mokeev, V.
Montgomery, R. A.
Moutarde, H.
Movsisyan, A.
Munevar, E.
Munoz Camacho, C.
Nadel-Turonski, P.
Net, L. A.
Niculescu, G.
Osipenko, M.
Ostrovidov, A. I.
DOI
10.1103/PhysRevLett.115.212003
Abstract
Unpolarized and beam-polarized fourfold cross sections ðd4σ=dQ2dxBdtdϕÞ for the ep → e0
p0
γ
reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the
Jefferson Lab accelerator, for 110 (Q2; xB; t) bins over the widest phase space ever explored in the valencequark region. Several models of generalized parton distributions (GPDs) describe the data well at most of
our kinematics. This increases our confidence that we understand the GPD H, expected to be the dominant
contributor to these observables. Through a leading-twist extraction of Compton form factors, these results
support the model predictions of a larger nucleon size at lower quark-momentum fraction xB.
p0
γ
reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the
Jefferson Lab accelerator, for 110 (Q2; xB; t) bins over the widest phase space ever explored in the valencequark region. Several models of generalized parton distributions (GPDs) describe the data well at most of
our kinematics. This increases our confidence that we understand the GPD H, expected to be the dominant
contributor to these observables. Through a leading-twist extraction of Compton form factors, these results
support the model predictions of a larger nucleon size at lower quark-momentum fraction xB.
Subjects
