Measurement of unpolarized and polarized cross sections for deeply virtual Compton scattering on the proton at Jefferson Laboratory with CLAS

Hirlinger Saylor, N.; Guegan, B.; Burkert, V. D.; Elouadrhiri, L.; Garcon, M.; Girod, F. X.; Guidal, M.; H. S., Jo; Kubarovsky, V.; Niccolai, S.; Stoler, P.; Adhikari, K. P.; Adhikari, S.; Akbar, Z.; Amaryan, M. J.; Pereira, S. A.; Ball, J.; Balossino, I.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Bultmann, S.; Cao, F.; Carman, D. S.; Celentano, A.; Charles, G.; Chetry, T.; Ciullo, G.; Clary, B. A.; Cole, P. L.; Contalbrigo, M.; Cortes, O.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Diehl, S.; Djalali, C.; Dupre, R.; Egiyan, H.; Alaoui, A. E.; Fassi, L. E.; Eugenio, P.; Fedotov, G.; Fersch, R.; Filippi, A.; Forest, T. A.; Fradi, A.; Gavalian, G.; Gevorgyan, N.; Ghandilyan, Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Gleason, C.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Harrison, N.; Hattawy, M.; Heddle, D.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Johnston, S.; Joo, K.; Joosten, S.; Kabir, M. L.; Keller, D.; Khachatryan, G.; Khachatryan, M.; Khandaker, M.; Kim, A.; Kim, W.; Klein, A.; Klein, F. J.; Kuhn, S. E.; Kuleshov, S. V.; Lanza, L.; Lenisa, P.; Livingston, K.; H. Y., Lu; Macgregor, I. J. D.; Markov, N.; Mccracken, M. E.; Mckinnon, B.; Meyer, C. A.; Meziani, Z. E.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Movsisyan, A.; Camacho, C. M.; Nadel-Turonski, P.; Niculescu, G.; Osipenko, M.; Ostrovidov, A. I.; Paolone, M.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Price, J. W.; Procureur, S.; Prok, Y.; Protopopescu, D.; Ripani, M.; Riser, D.; Rizzo, A.; Rosner, G.; Rossi, P.; Sabatie, F.; Salgado, C.; Schumacher, R. A.; Sharabian, Y. G.; Skorodumina, I.; Smith, G. D.; Sparveris, N.; Stepanyan, S.; Strauch, S.; Taiuti, M.; Tan, J. A.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, X.; Wood, M. H.; Zachariou, N.; Zhang, J.; Zhao, Z. W.

doi:10.1103/PhysRevC.98.045203

This paper reports the measurement of polarized and unpolarized cross sections for the ep→e′p′γ reaction, which is composed of deeply virtual Compton scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10<0.58, 1.0<4.8GeV2, and 0.09<-t<2.00GeV2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models are approximately compatible with the experimental results over a large portion of the kinematic range of the data.

Measurement of unpolarized and polarized cross sections for deeply virtual Compton scattering on the proton at Jefferson Laboratory with CLAS

Hirlinger Saylor N.;Guegan B.;Burkert V. D.;Elouadrhiri L.;Garcon M.;Girod F. X.;Guidal M.;Jo H. S.;Kubarovsky V.;Niccolai S.;Stoler P.;Adhikari K. P.;Adhikari S.;Akbar Z.;Amaryan M. J.;Pereira S. A.;Ball J.;Balossino I.;Baltzell N. A.;Barion L.;Battaglieri M.;Batourine V.;Bedlinskiy I.;Biselli A. S.;Boiarinov S.;Briscoe W. J.;Brooks W. K.;Bultmann S.;Cao F.;Carman D. S.;Celentano A.;Charles G.;Chetry T.;Ciullo G.;Clary B. A.;Cole P. L.;Contalbrigo M.;Cortes O.;D'Angelo A.;Dashyan N.;De Vita R.;Defurne M.;Deur A.;Diehl S.;Djalali C.;Dupre R.;Egiyan H.;Alaoui A. E.;Fassi L. E.;Eugenio P.;Fedotov G.;Fersch R.;Filippi A.;Forest T. A.;Fradi A.;Gavalian G.;Gevorgyan N.;Ghandilyan Y.;Gilfoyle G. P.;Giovanetti K. L.;Gleason C.;Gohn W.;Golovatch E.;Gothe R. W.;Griffioen K. A.;Guo L.;Hafidi K.;Hakobyan H.;Hanretty C.;Harrison N.;Hattawy M.;Heddle D.;Hicks K.;Holtrop M.;Ilieva Y.;Ireland D. G.;Ishkhanov B. S.;Isupov E. L.;Jenkins D.;Johnston S.;Joo K.;Joosten S.;Kabir M. L.;Keller D.;Khachatryan G.;Khachatryan M.;Khandaker M.;Kim A.;Kim W.;Klein A.;Klein F. J.;Kuhn S. E.;Kuleshov S. V.;Lanza L.;Lenisa P.;Livingston K.;Lu H. Y.;Macgregor I. J. D.;Markov N.;McCracken M. E.;McKinnon B.;Meyer C. A.;Meziani Z. E.;Mineeva T.;Mirazita M.;Mokeev V.;Montgomery R. A.;Movsisyan A.;Camacho C. M.;Nadel-Turonski P.;Niculescu G.;Osipenko M.;Ostrovidov A. I.;Paolone M.;Paremuzyan R.;Park K.;Pasyuk E.;Phelps W.;Pogorelko O.;Price J. W.;Procureur S.;Prok Y.;Protopopescu D.;Ripani M.;Riser D.;Rizzo A.;Rosner G.;Rossi P.;Sabatie F.;Salgado C.;Schumacher R. A.;Sharabian Y. G.;Skorodumina I.;Smith G. D.;Sparveris N.;Stepanyan S.;Strauch S.;Taiuti M.;Tan J. A.;Ungaro M.;Voskanyan H.;Voutier E.;Watts D. P.;Wei X.;Wood M. H.;Zachariou N.;Zhang J.;Zhao Z. W.

2018-01-01

Abstract

This paper reports the measurement of polarized and unpolarized cross sections for the ep→e′p′γ reaction, which is composed of deeply virtual Compton scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10<0.58, 1.0<4.8GeV2, and 0.09<-t<2.00GeV2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models are approximately compatible with the experimental results over a large portion of the kinematic range of the data.