Wide-angle pion-Delta(1232) photoproduction
Abstract
High-energy wide-angle photoproduction of pion-Delta final states is investigated within the handbag mechanism to twist-3 accuracy. In this approach the process amplitudes factorize in a hard partonic subprocess and and in form factors which represent 1/x-moments of p-Delta transition generalized parton distributions (GPDs) at zero skewness. The subproces, calculated to twist-3 accuracy, is the same as in pion photoproduction. The p-Delta GPDs are related to the proton-proton GPDs exploiting large-N_C results. The proton-proton GPDs as well as the twist-2 and twist-3 pion distribution amplitudes appearing in the subprocess are taken from other work. Reasonable agreement with experiment is found in this almost parameter-free analysis.
Cite
@article{arxiv.2501.02502,
title = {Wide-angle pion-Delta(1232) photoproduction},
author = {P. Kroll},
journal= {arXiv preprint arXiv:2501.02502},
year = {2025}
}
Comments
24 pages, 8 figures