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Chatagnon, P.; Niccolai, S.; Stepanyan, S.; Amaryan, M. J.; Angelini, G.; Armstrong, W. R.; Atac, H.; Gayoso, C. Ayerbe; Baltzell, N. A.; Barion, L.; Bashkanov, M.; Battaglieri, M.; Bedlinskiy, I.; Benmokhtar, F.; Bianconi, A.; Biondo, L.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Bulumulla, D.; Burkert, V. D.; Carman, D. S.; Carvajal, J. C.; Caudron, M.; Celentano, A.; Chetry, T.; Ciullo, G.; Clark, L.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Crede, V.; d'Angelo, A.; Dashyan, N.; Defurne, M.; de Vita, R.; Deur, A.; Diehl, S.; Djalali, C.; Dupré, R.; Egiyan, H.; Ehrhart, M.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Fegan, S.; Fersch, R.; Filippi, A.; Gavalian, G.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Glazier, D. I.; Golubenko, A. A.; Gothe, R. W.; Gotra, Y.; Griffioen, K. A.; Guidal, M.; Guo, L.; Hakobyan, H.; Hattawy, M.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Hyde, C. E.; Ilieva, Y.; Ireland, D. G.; Isupov, E. L.; Jo, H. S.; Joo, K.; Kabir, M. L.; Keller, D.; Khachatryan, G.; Khanal, A.; Kim, A.; Kim, W.; Kripko, A.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Leali, M.; Lee, S.; Lenisa, P.; Livingston, K.; Macgregor, I . J . D.; Marchand, D.; Marsicano, L.; Mascagna, V.; Mckinnon, B.; Mclauchlin, C.; Migliorati, S.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Camacho, C. Munoz; Nadel-Turonski, P.
Physical review letters, 2021, Letnik: 127Journal Article
We present the first measurement of the Timelike Compton Scattering process, $\gamma p\to p^\prime \gamma^* (\gamma^*\to 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 $2.25<Q^{\prime 2}<9$ 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 Deeply 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.
