Cross sections for the exclusive photon electroproduction on the proton and generalized parton distributions

Jo, H. S. et al. (2015) Cross sections for the exclusive photon electroproduction on the proton and generalized parton distributions. Physical Review Letters, 115, 212003. (doi:10.1103/PhysRevLett.115.212003) (PMID:26636848)

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Abstract

Unpolarized and beam-polarized fourfold cross sections (d4σ/dQ2dxBdtdϕ) for the ep → e'p'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 valence-quark 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.

Item Type:Articles (Letter)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and Fegan, Mr Stuart and MacGregor, Professor I and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Montgomery, Dr Rachel and Ireland, Professor David and Rosner, Professor Guenther
Authors: 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., Brooks, W. K., 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., Alaoui, A. E., Fassi, L. E., 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., Hakobyan, H., 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., Kuleshov, S. V., 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., Paolone, M., Park, K., Pasyuk, E., Phillips, J.J., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Puckett, A. J. R., Raue, B. A., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Simonyan, A., Skorodumina, I., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Sytnik, V., Tian, Y., Tkachenko, S., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., and Zonta, I.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Journal Abbr.:PRL
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Copyright Holders:American Physical Society

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