Longitudinal target-spin asymmetries for deeply virtual Compton scattering

Seder, E. et al. (2015) Longitudinal target-spin asymmetries for deeply virtual Compton scattering. Physical Review Letters, 114(3), 032001. (doi: 10.1103/PhysRevLett.114.032001)

Abstract

A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6-GeV electron beam, a longitudinally polarized proton target and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep -> e'p'g events, which arise from the interference of the deeply virtual Compton scattering and the Bethe- Heitler processes, were extracted over the widest kinematics in Q2, xB, t and phi, for 166 four-dimensional bins. In the framework of Generalized Parton Distributions (GPDs), at leading twist the t dependence of these asymmetries provides insight on the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even GPDs.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sokhan, Dr Daria and Fegan, Mr Stuart and Protopopescu, Dr Dan and Smith, Mr Gary and MacGregor, Professor Douglas and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Montgomery, Dr Rachel and Ireland, Professor David and Rosner, Professor Guenther
• Authors: Seder, E., Bisseli, A., Pisano, S., Niccolai, S., Smith, G.D., Joo, K., Adhikari, K.P., Amaryan, M.J., Anderson, M.D., Anefalos Pereira, S., Avakian, H., Battaglieri, M., Bedlinskiy, I., Bono, J., Boiarinov, S., Bosted, P., Briscoe, W.J., Brock, J., Brooks, W.K., Bultmann, S., Burkert, V.D., Carman, D.S., Carlin, C., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P.L., Contalbrigo, M., Crabb, D., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Fradi, A., Garillon, B., Garcon, M., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gothe, R.W., Griffioen, K.A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hirlinger Saylor, N., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joosten, S., Keith, C.D., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, V., Kuhn, S.E., Lu, H.Y., MacGregor, I.J.D., Markov, N., Mayer, M., McKinnon, B., Meekins, D.G., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R., Moody, C.I., Moutarde, H., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Pappalardo, L.L., Park, K., Park, S., Pasyuk, E., Peng, P., Phelps, W., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Puckett, A.J.R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Salgado, C., Schott, D., Schumacher, R.A., Senderovich, I., Simonyan, A., Skorodumina, I., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I., Strauch, S., Sytnik, V., Taiuti, M., Tang, W., Tian, Y., 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., Zonta, I., Kim, A., Kubarovsky, V., Khun, S.E., Lenisa, P., and Livingston, K.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: Nuclear Physics
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114