Tests for the asymptotic behaviour of the gamma^* --> gamma pi^0 form factor
High Energy Physics - Phenomenology
2014-11-17 v2
Abstract
The gamma^* --> gamma pi^0 transition measured at different photon virtualities already provides us with a clean test for the behaviour of the pi^0 gamma^* gamma off-shell axial anomaly at large time-like squared momenta. It also allows reliable predictions for the branching ratio of heavy quarkonium decays into omega pi^0.
Cite
@article{arxiv.hep-ph/9709404,
title = {Tests for the asymptotic behaviour of the gamma^* --> gamma pi^0 form factor},
author = {J. -M. Gerard and G. Lopez Castro},
journal= {arXiv preprint arXiv:hep-ph/9709404},
year = {2014}
}
Comments
Latex, 7 pages + 1 .ps figure, comments on the Brodsky-Lepage limit and 5 new references added