First-time measurement of Timelike Compton Scattering
Abstract
We present the first measurement of the Timelike Compton Scattering process, , 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 GeV, squared momentum transferred GeV, and average total center-of-mass energy squared GeV. 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.
Cite
@article{arxiv.2108.11746,
title = {First-time measurement of Timelike Compton Scattering},
author = {P. Chatagnon and S. Niccolai and S. Stepanyan and M. J. Amaryan and G. Angelini and W. R. Armstrong and H. Atac and C. Ayerbe Gayoso and N. A. Baltzell and L. Barion and M. Bashkanov and M. Battaglieri and I. Bedlinskiy and F. Benmokhtar and A. Bianconi and L. Biondo and A. S. Biselli and M. Bondi and F. Bossù and S. Boiarinov and W. J. Briscoe and W. K. Brooks and D. Bulumulla and V. D. Burkert and D. S. Carman and J. C. Carvajal and M. Caudron and A. Celentano and T. Chetry and G. Ciullo and L. Clark and P. L. Cole and M. Contalbrigo and G. Costantini and V. Crede and A. D'Angelo and N. Dashyan and M. Defurne and R. De Vita and A. Deur and S. Diehl and C. Djalali and R. Dupré and H. Egiyan and M. Ehrhart and A. El Alaoui and L. El Fassi and L. Elouadrhiri and S. Fegan and R. Fersch and A. Filippi and G. Gavalian and Y. Ghandilyan and G. P. Gilfoyle and F. X. Girod and D. I. Glazier and A. A. Golubenko and R. W. Gothe and Y. Gotra and K. A. Griffioen and M. Guidal and L. Guo and H. Hakobyan and M. Hattawy and T. B. Hayward and D. Heddle and A. Hobart and M. Holtrop and C. E. Hyde and Y. Ilieva and D. G. Ireland and E. L. Isupov and H. S. Jo and K. Joo and M. L. Kabir and D. Keller and G. Khachatryan and A. Khanal and A. Kim and W. Kim and A. Kripko and V. Kubarovsky and S. E. Kuhn and L. Lanza and M. Leali and S. Lee and P. Lenisa and K. Livingston and I . J . D. MacGregor and D. Marchand and L. Marsicano and V. Mascagna and B. McKinnon and C. McLauchlin and S. Migliorati and M. Mirazita and V. Mokeev and R. A. Montgomery and C. Munoz Camacho and P. Nadel-Turonski and P. Naidoo and K. Neupane and T. R. O'Connell and M. Osipenko and M. Ouillon and P. Pandey and M. Paolone and L. L. Pappalardo and R. Paremuzyan and E. Pasyuk and W. Phelps and O. Pogorelko and J. Poudel and J. W. Price and Y. Prok and B. A. Raue and T. Reed and M. Ripani and A. Rizzo and P. Rossi and J. Rowley and F. Sabatié and A. Schmidt and E. P. Segarra and Y. G. Sharabian and E. V. Shirokov and U. Shrestha and D. Sokhan and O. Soto and N. Sparveris and I. I. Strakovsky and S. Strauch and N. Tyler and R. Tyson and M. Ungaro and S. Vallarino and L. Venturelli and H. Voskanyan and A. Vossen and E. Voutier and D. P. Watts and K. Wei and X. Wei and R. Wishart and B. Yale and N. Zachariou and J. Zhang and Z. W. Zhao and the CLAS Collaboration},
journal= {arXiv preprint arXiv:2108.11746},
year = {2022}
}