Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

H. S. Jo, F. X. Girod, H. Avakian, V. D. Burkert, M. Garçon, M. Guidal, V. Kubarovsky, S. Niccolai, P. Stoler, K. P. Adhikari, D. Adikaram, M. J. Amaryan, M. D. Anderson, S. Anefalos Pereira, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, A. S. BiselliS. Boiarinov, W. J. Briscoe, W. K. Brooks, D. S. Carman, A. Celentano, S. Chandavar, G. Charles, L. Colaneri, P. L. Cole, N. Compton, M. Contalbrigo, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, R. Dupre, A. El Alaoui, L. El Fassi, L. Elouadrhiri, G. Fedotov, S. Fegan, A. Filippi, J. A. Fleming, B. Garillon, N. Gevorgyan, Y. Ghandilyan, G. P. Gilfoyle, K. L. Giovanetti, J. T. Goetz, E. Golovatch, R. W. Gothe, K. A. Griffioen, B. Guegan, N. Guler, L. Guo, K. Hafidi, H. Hakobyan, N. Harrison, M. Hattawy, K. Hicks, N. Hirlinger Saylor, D. Ho, M. Holtrop, S. M. Hughes, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, D. Jenkins, K. Joo, S. Joosten, D. Keller, G. Khachatryan, M. Khandaker, A. Kim, W. Kim, A. Klein, F. J. Klein, S. E. Kuhn, S. V. Kuleshov, P. Lenisa, K. Livingston, H. Y. Lu, I. J.D. Macgregor, B. McKinnon, Z. E. Meziani, M. Mirazita, V. Mokeev, R. A. Montgomery, H. Moutarde, A. Movsisyan, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, L. A. Net, G. Niculescu, M. Osipenko, A. I. Ostrovidov, M. Paolone, K. Park, E. Pasyuk, J. J. Phillips, S. Pisano, O. Pogorelko, J. W. Price, S. Procureur, Y. Prok, A. J.R. Puckett, B. A. Raue, M. Ripani, A. Rizzo, G. Rosner, P. Rossi, P. Roy, F. Sabatié, C. Salgado, D. Schott, R. A. Schumacher, E. Seder, A. Simonyan, Iu Skorodumina, G. D. Smith, D. Sokhan, N. Sparveris, S. Stepanyan, I. I. Strakovsky, S. Strauch, V. Sytnik, Ye Tian, S. Tkachenko, M. Ungaro, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Watts, X. Wei, L. B. Weinstein, M. H. Wood, N. Zachariou, L. Zana, J. Zhang, Z. W. Zhao, I. Zonta

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Resumen

© 2015 American Physical Society. 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.
Idioma originalInglés
PublicaciónPhysical Review Letters
DOI
EstadoPublicada - 17 nov 2015
Publicado de forma externa

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    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., ... Zonta, I. (2015). Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions. Physical Review Letters. https://doi.org/10.1103/PhysRevLett.115.212003