The process p + pbar --> gamma + pi^0 within the handbag approch
Abstract
We analyse the exclusive channel , assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the transition and form factors for the ones, the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking simultaneously into account information from other exclusive reactions, especially from data. Overall a nicely consistent picture emerges, such that one can hope, that our theoretical analysis will be reliable also for the kinematics of GSI/FAIR, which hopefully will provide much more precise and complete data. Consequently, data from this facility should improve our knowledge both on the proton-antiproton distribution amplitudes and the pion production mechanism.
Cite
@article{arxiv.hep-ph/0505258,
title = {The process p + pbar --> gamma + pi^0 within the handbag approch},
author = {P. Kroll and A. Schafer},
journal= {arXiv preprint arXiv:hep-ph/0505258},
year = {2025}
}