Backward timelike Compton scattering to decipher the photon content of the nucleon
Abstract
The exclusive photoproduction off nucleon of a large invariant mass lepton pair in the backward region specified by the small Mandelstam variable is discussed in the framework of collinear QCD factorization. The amplitude is factorized in terms of photon-to-nucleon Transition Distribution Amplitudes (TDAs) which encode the photon content of the nucleon. Model estimates of these new non-perturbative objects are described and the corresponding cross sections calculated. The background due to the electromagnetic Bethe-Heitler process is shown to be negligible in the kinematical regime of interest.
Keywords
Cite
@article{arxiv.2201.12853,
title = {Backward timelike Compton scattering to decipher the photon content of the nucleon},
author = {Bernard Pire and Kirill M. Semenov-Tian-Shansky and Alisa A. Shaikhutdinova and Lech Szymanowski},
journal= {arXiv preprint arXiv:2201.12853},
year = {2022}
}
Comments
33 pages, 9 figures, 1 table. A major revision of the paper. A sign mistake was corrected in amplitude calculations. This resulted in predicting higher cross section for the bTCS reaction