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First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region.

Christiaens, G; Defurne, M; Sokhan, D; Achenbach, P; Akbar, Z; Amaryan, M J; Atac, H; Avakian, H; Gayoso, C Ayerbe; Baashen, L; Baltzell, N A; Barion, L; Bashkanov, M; Battaglieri, M; Bedlinskiy, I; Benkel, B; Benmokhtar, F; Bianconi, A; Biselli, A S; Bondi, M; Booth, W A; Bossù, F; Boiarinov, S; Brinkmann, K-Th; Briscoe, W J; Bueltmann, S; Bulumulla, D; Burkert, V D; Cao, T; Carman, D S; Carvajal, J C; Celentano, A; Chatagnon, P; Chesnokov, V; Chetry, T; Ciullo, G; Clash, G; Cole, P L; Contalbrigo, M; Costantini, G; D'Angelo, A; Dashyan, N; De Vita, R; Deur, A; Diehl, S; Dilks, C; Djalali, C; Dupre, R; Egiyan, H; Ehrhart, M.

Phys Rev Lett ; 130(21): 211902, 2023 May 26.

Article in English | MEDLINE | ID: mdl-37295113

ABSTRACT

Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions 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 unpolarized protons. The results greatly extend the Q^{2} and Bjorken-x phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.

ABSTRACT

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