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Chatagnon, P; Niccolai, S; Amaryan, M J; Armstrong, W R; Atac, H; Baltzell, N A; Battaglieri, M; Bedlinskiy, I; Benmokhtar, F; Bianconi, A; Biondo, L; Biselli, A S; Bondi, M; Boiarinov, S; Brooks, W K; Bulumulla, D; Burkert, V D; Carman, D S; Carvajal, J C; Celentano, A; Clark, L; Cole, P L; Contalbrigo, M; Costantini, G; Crede, V; D'Angelo, A; Defurne, M; De Vita, R; Djalali, C; Dupré, R; Egiyan, H; Ehrhart, M; El Alaoui, A; El Fassi, L; Elouadrhiri, L; Fegan, S; Filippi, A; Gavalian, G; Gilfoyle, G P; Gothe, R W; Gotra, Y; Griffioen, K A; Guo, L; Hakobyan, H; Hattawy, M; Heddle, D; Holtrop, M; Ilieva, Y; Ireland, D G; Isupov, E L; Jo, H S; Joo, K; Kabir, M L; Keller, D; Khachatryan, G; Khanal, A; Kubarovsky, V; Lanza, L; Lee, S; Lenisa, P; MacGregor, I J D; Marsicano, L; McKinnon, B; Mirazita, M; Mokeev, V; Munoz Camacho, C; Nadel-Turonski, P; Naidoo, P; Neupane, K; O'Connell, T R; Ouillon, M; Pandey, P; Pappalardo, L L; Paremuzyan, R; Pasyuk, E; Pogorelko, O; Poudel, J; Ripani, M; Rowley, J; Schmidt, A; Segarra, E P; Sharabian, Y G; Shirokov, E V; Shrestha, U; Soto, O; Strakovsky, I I; Tyler, N; Tyson, R; Ungaro, M; Vallarino, S; Venturelli, L; Voskanyan, H; Vossen, A; Voutier, E; Wei, K; Wei, X; Wishart, R; Yale, B; Zachariou, N; Zhao, Z W
Physical review letters, 12/2021, Volume: 127, Issue: 26Journal Article
We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the range of timelike photon virtualities 2.25<Q^{'2}<9 GeV^{2}, squared momentum transferred 0.1<-t<0.8 GeV^{2}, and average total center-of-mass energy squared s=14.5 GeV^{2}. The photon beam polarization asymmetry, similar to the beam-spin asymmetry in deep virtual Compton scattering, is sensitive to the imaginary part of the Compton form factors and provides a way to test the universality of the generalized parton distributions. The angular asymmetry of the decay leptons accesses the real part of the Compton form factors and thus the D-term in the parametrization of the generalized parton distributions.
