Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab

• Published in: arXiv.org 2022-01
• Main Authors: 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
• Format: Article
• Language: English
• Subjects: Elastic scattering; Kinematics; Neutral particles; Positron beams; Positrons; Proton beams; Scattering cross sections
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2105.06540

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.