First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region

• Main Authors: CLAS Collaboration, Defurne, M, Akbar, Z, Amaryan, M. J, Atac, H, Avakian, H, Gayoso, C. Ayerbe, Baashen, L, Baltzell, N. A, Bashkanov, M, Battaglieri, M, Benmokhtar, F, Bianconi, A, Biselli, A. S, Briscoe, W. J, Bueltmann, S, Bulumulla, D, Cao, T, Carman, D. S, Celentano, A, Chesnokov, V, Chetry, T, Ciullo, G, Clash, G, Contalbrigo, M, D'Angelo, A, Dashyan, N, De Vita, R, Deur, A, Djalali, C, Dupre, R, Ehrhart, M, Fassi, L. El, Fegan, S, Gavalian, G, Ghandilyan, Y, Gilfoyle, G. P, Girod, F. X, Glazier, D. I, Gothe, R. W, Gotra, Y, Griffioen, K. A, Guidal, M, Hafidi, K, Hattawy, M, Hayward, T. B, Heddle, D, Holmberg, D. E, Ireland, D. G, Isupov, E. L, Khachatryan, M, Kripko, A, Kubarovsky, V, Kuhn, S. E, Lagerquist, V, Lanza, L, Lee, S, Li, X, Mascagna, V, Matousek, G, Meziani, Z. E, Migliorati, S, Milner, R. G, Mineeva, T, Mokeev, V, Naidoo, P, Neupane, K, Niculescu, G, Osipenko, M, Paolone, M, Pappalardo, L. L, Paul, S. J, Phelps, W, Pokhrel, M, Prok, Y, Radic, A, Ramasubramanian, N, Raue, B. A, Reed, T, Richards, J, Ripani, M, Rossi, P, Salgado, C, Schadmand, S, Schmidt, A, Spreafico, M, Strakovsky, I. I, Tan, J. A, Trotta, N, Turisini, M, Ungaro, M, Venturelli, L, Voskanyan, H, Watts, D. P, Wei, X, Williams, R, Zachariou, N, Zhao, Z. W, Ziegler, V, Zurek, M
• Format: Journal Article
• Language: English
• Published: 21-11-2022
• Subjects: Physics - High Energy Physics - Experiment
• DOI: 10.48550/arxiv.2211.11274

Deeply virtual Compton scattering (DVCS) allows one to probe Generalized
Parton Distributions (GPDs) describing the 3D structure of the nucleon. We
report the first measurement of the DVCS beam-spin asymmetry using the CLAS12
spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarised
protons. The results greatly extend the $Q^2$ and Bjorken-$x$ phase space
beyond the existing data in the valence region and provide over 2000 new data
points measured with unprecedented statistical uncertainty, setting new, tight
constraints for future phenomenological studies.