On the large-Q^2 behavior of the pion transition form factor
High Energy Physics - Phenomenology
2017-11-22 v3 High Energy Physics - Lattice
Nuclear Theory
Abstract
We study the transition of non-perturbative to perturbative QCD in situations with possible violations of scaling limits. To this end we consider the singly- and doubly-virtual pion transition form factor at all momentum scales of symmetric and asymmetric photon momenta within the Dyson-Schwinger/Bethe-Salpeter approach. For the doubly virtual form factor we find good agreement with perturbative asymptotic scaling laws. For the singly-virtual form factor our results agree with the Belle data. At very large off-shell photon momenta we identify a mechanism that introduces quantitative modifications to Efremov-Radyushkin-Brodsky-Lepage scaling.
Keywords
Cite
@article{arxiv.1704.05774,
title = {On the large-Q^2 behavior of the pion transition form factor},
author = {Gernot Eichmann and Christian S. Fischer and Esther Weil and Richard Williams},
journal= {arXiv preprint arXiv:1704.05774},
year = {2017}
}
Comments
5 pages, 7 figures, v3:contents revised, version published in PLB