作者
P Chatagnon, S Niccolai, S Stepanyan, MJ Amaryan, G Angelini, WR Armstrong, H Atac, C Ayerbe Gayoso, NA Baltzell, L Barion, M Bashkanov, M Battaglieri, I Bedlinskiy, F Benmokhtar, A Bianconi, L Biondo, AS Biselli, M Bondi, F Bossù, S Boiarinov, WJ Briscoe, WK Brooks, D Bulumulla, VD Burkert, DS Carman, JC Carvajal, M Caudron, A Celentano, T Chetry, G Ciullo, Louise Clark, PL Cole, M Contalbrigo, G Costantini, V Crede, A D’Angelo, N Dashyan, M Defurne, R De Vita, A Deur, S Diehl, C Djalali, R Dupré, H Egiyan, M Ehrhart, A El Alaoui, L El Fassi, L Elouadrhiri, S Fegan, R Fersch, A Filippi, G Gavalian, Y Ghandilyan, GP Gilfoyle, FX Girod, Derek I Glazier, AA Golubenko, RW Gothe, Y Gotra, KA Griffioen, M Guidal, L Guo, H Hakobyan, M Hattawy, TB Hayward, D Heddle, A Hobart, M Holtrop, CE Hyde, Y Ilieva, David G Ireland, EL Isupov, HS Jo, K Joo, ML Kabir, D Keller, G Khachatryan, A Khanal, A Kim, W Kim, A Kripko, V Kubarovsky, SE Kuhn, L Lanza, M Leali, S Lee, P Lenisa, Kenneth Livingston, IJD MacGregor, D Marchand, L Marsicano, V Mascagna, Bryan McKinnon, C McLauchlin, S Migliorati, M Mirazita, V Mokeev, Rachel A Montgomery, C Munoz Camacho, P Nadel-Turonski, Paul Naidoo, K Neupane, TR O’Connell, M Osipenko, M Ouillon, P Pandey, M Paolone, LL Pappalardo, R Paremuzyan, E Pasyuk, W Phelps, O Pogorelko, J Poudel, JW Price, Y Prok, BA Raue, T Reed, M Ripani, A Rizzo, P Rossi, J Rowley, F Sabatié, A Schmidt, EP Segarra, YG Sharabian, EV Shirokov, U Shrestha, Daria Sokhan, O Soto, N Sparveris, II Strakovsky, S Strauch, N Tyler, Richard Tyson, M Ungaro, S Vallarino, L Venturelli, H Voskanyan, A Vossen, E Voutier, DP Watts, K Wei, X Wei, Robert Wishart, B Yale, N Zachariou, J Zhang, ZW Zhao, Clas Collaboration
发表日期
2021/12/22
期刊
Physical review letters
卷号
127
期号
26
页码范围
262501
出版商
American Physical Society
简介
We present the first measurement of the timelike Compton scattering process, γ p→ 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.
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P Chatagnon, S Niccolai, S Stepanyan, MJ Amaryan… - Physical review letters, 2021