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  • Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab
    Afanasev, A; Albayrak, I; Ali, S; Amaryan, M; Annand, J R M; Asaturyan, A; Bellini, V; Berdnikov, V V; Boer, M; Brinkmann, K; Briscoe, W J; Camsonne, A; Caudron, M; Causse, L; Carmignotto, M; Day, D; Defurne, M; Diehl, S; Ent, R; Chatagnon, P; Dupré, R; Dutta, D; Ehrhart, M; Fernando, M A I; est, T; Guidal, M; Grames, J; Gueye, P; Habet, S; Hamilton, D J; Hobart, A; Horn, T; Hyde, C; Kalicy, G; Keller, D; Keppel, C; Kerver, M; Kinney, E; H -S Ko; Marchand, D; Markowitze, P; Mazouz, M; McCaughan, M; McKinnon, B; Mkrtchyan, A; Mkrtchyan, H; Muhoza, M; C Muñoz Camacho; Murphy, J; Nadel-Turonski, P; Niccolai, S; Niculescu, G; Novotny, R; Paremuzyan, R; Pegg, I; Price, K; Rashad, H; Roche, J; Rondon, R; Sawatzky, B; Sergeyeva, V; Širca, S; Somov, A; Strakovsky, I; Tadevosyan, V; Trotta, R; Voskanyan, H; Voutier, E; Wojtsekhowski, B; Wood, S; Zhamkochyan, S; Zhang, J; Zhao, S; Zorn, C

    arXiv.org, 01/2022
    Paper, Journal Article

    We propose to use the High Momentum Spectrometer of Hall C combined with the Neutral Particle Spectrometer (NPS) to perform high precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section using a beam of positrons. The combination of measurements with oppositely charged incident beams is the only unambiguous way to disentangle the contribution of the DVCS\(^2\) term in the photon electroproduction cross section from its interference with the Bethe-Heitler amplitude. This provides a stronger way to constrain the Generalized Parton Distributions of the nucleon. A wide range of kinematics accessible with an 11 GeV beam off an unpolarized proton target will be covered. The \(Q^2-\)dependence of each contribution will be measured independently.

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