The $\pi\gamma$ transition form factor and its impact on charmonium decays into two pions
High Energy Physics - Phenomenology
2007-05-23 v1
Abstract
The analysis of the transition form factor provides severe constraints on the pion's wave function. This information is used to examine charmonium decays into two pions critically. It will be argued that the standard perturbative QCD analysis of these reactions fails, i.e. the need for additional contributions can convincingly be demonstrated. Colour-octet admixtures to the charmonium states are proposed as a possible dynamical mechanisms to solve the puzzle. Consequences of the analysis for the electromagnetic form factor of the pion are also discussed.
Cite
@article{arxiv.hep-ph/9701319,
title = {The $\pi\gamma$ transition form factor and its impact on charmonium decays into two pions},
author = {Peter Kroll},
journal= {arXiv preprint arXiv:hep-ph/9701319},
year = {2007}
}
Comments
12 pages, 3 postscript figures, Latex, to be published in the proceedings of the Third Workshop on Diquarks, Torino (October 1996)