The scattering amplitude for photoproduction of a large invariant mass diphoton in the generalized Bjorken regime has a very peculiar and interesting analytical structure. The leading twist leading order amplitude is proportional to valence quark generalized parton distributions taken at the border value x=±ξ. Cross section estimates show that this process is measurable at JLab energies. The angular asymmetry triggered by a linearly polarized photon beam is large.
@article{arxiv.1907.08431,
title = {Exclusive production of a large mass photon pair},
author = {A. Pedrak and B. Pire and L. Szymanowski and J. Wagner},
journal= {arXiv preprint arXiv:1907.08431},
year = {2019}
}
Comments
5 pages, contribution to the proceedings of the XXVII. International Workshop on Deep-Inelastic Scattering and Related Subjects, April 8-12, 2019,Torino, Italy