FCCC LOGO Faculty Publications
Hattawy M , Baltzell NA , Dupre R , Bultmann S , De Vita R , El Alaoui A , El Fassi L , Egiyan H , Girod FX , Guidal M , Hafidi K , Jenkins D , Liuti S , Perrin Y , Stepanyan S , Torayev B , Voutier E , Adhikari S , Angelini G , Ayerbe Gayoso C , Barion L , Battaglieri M , Bedlinskiy I , Biselli AS , Bossu F , Brooks W , Cao F , Carman DS , Celentano A , Chatagnon P , Chetry T , Ciullo G , Clark L , Cole PL , Contalbrigo M , Crede V , D'Angelo A , Dashyan N , De Sanctis E , Defurne M , Deur A , Diehl S , Djalali C , Ehrhart M , Eugenio P , Fegan S , Filippi A , Forest TA , Fradi A , Garcon M , Gavalian G , Gevorgyan N , Gilfoyle GP , Giovanetti KL , Golovatch E , Gothe RW , Griffioen KA , Harrison N , Hauenstein F , Hayward TB , Heddle D , Hicks K , Holtrop M , Ilieva Y , Ireland DG , Isupov EL , Jo HS , Johnston S , Keller D , Khachatryan G , Khachatryan M , Khanal A , Khandaker M , Kim CW , Kim W , Klein FJ , Kubarovsky V , Kuhn SE , Lanza L , LKabir M , Lenisa P , Livingston K , MacGregor IJD , Marchand D , Markov N , Mayer M , McKinnon B , Meziani ZE , Mineeva T , Mirazita M , Montgomery RA , Munoz Camacho C , Nadel-Turonski P , Niccolai S , Ostrovidov AI , Pappalardo LL , Paremuzyan R , Pasyuk E , Pogorelko O , Poudel J , Prok Y , Protopopescu D , Ripani M , Riser D , Rizzo A , Rosner G , Rossi P , Sabatie F , Salgado C , Schumacher RA , Sharabian YG , Skorodumina I , Sokhan D , Soto O , Sparveris N , Strauch S , Taiuti M , Tan JA , Tyler N , Ungaro M , Voskanyan H , Wang R , Watts DP , Wei X , Weinstein LB , Wood MH , Zachariou N , Zhang J , Zhao ZW
Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
Phys Rev Lett. 2019 Jul 19;123(3) :032502
Back to previous list
Abstract
In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this Letter, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering off a proton bound in ^{4}He. The data used here were accumulated using a 6 GeV longitudinally polarized electron beam incident on a pressurized ^{4}He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle (varphi) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The Q^{2}, x_{B}, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20% to 40%, indicating possible medium modification of its partonic structure.
Notes
1079-7114 Hattawy, M Baltzell, N A Dupre, R Bultmann, S De Vita, R El Alaoui, A El Fassi, L Egiyan, H Girod, F X Guidal, M Hafidi, K Jenkins, D Liuti, S Perrin, Y Stepanyan, S Torayev, B Voutier, E Adhikari, S Angelini, Giovanni Ayerbe Gayoso, C Barion, L Battaglieri, M Bedlinskiy, I Biselli, A S Bossu, F Brooks, W Cao, F Carman, D S Celentano, A Chatagnon, P Chetry, T Ciullo, G Clark, L Cole, P L Contalbrigo, M Crede, V D'Angelo, A Dashyan, N De Sanctis, E Defurne, M Deur, A Diehl, S Djalali, C Ehrhart, M Eugenio, P Fegan, S Filippi, A Forest, T A Fradi, A Garcon, M Gavalian, G Gevorgyan, N Gilfoyle, G P Giovanetti, K L Golovatch, E Gothe, R W Griffioen, K A Harrison, N Hauenstein, F Hayward, T B Heddle, D Hicks, K Holtrop, M Ilieva, Y Ireland, D G Isupov, E L Jo, H S Johnston, S Keller, D Khachatryan, G Khachatryan, M Khanal, A Khandaker, M Kim, C W Kim, W Klein, F J Kubarovsky, V Kuhn, S E Lanza, L L Kabir, M Lenisa, P Livingston, K MacGregor, I J D Marchand, D Markov, N Mayer, M McKinnon, B Meziani, Z E Mineeva, T Mirazita, M Montgomery, R A Munoz Camacho, C Nadel-Turonski, P Niccolai, S Ostrovidov, A I Pappalardo, L L Paremuzyan, R Pasyuk, E Pogorelko, O Poudel, J 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, Iu Sokhan, D Soto, O Sparveris, N Strauch, S Taiuti, M Tan, J A Tyler, N Ungaro, M Voskanyan, H Wang, R Watts, D P Wei, X Weinstein, L B Wood, M H Zachariou, N Zhang, J Zhao, Z W CLAS Collaboration Journal Article United States Phys Rev Lett. 2019 Jul 19;123(3):032502. doi: 10.1103/PhysRevLett.123.032502.