A perturbative approach to the eta_c-gamma transition form factor
High Energy Physics - Phenomenology
2010-11-19 v1
Abstract
The eta_c-gamma transition form factor is calculated within a perturbative approach. For the eta_c-meson, a wave function of the Bauer-Stech-Wirbel type is used where the two free parameters, namely the decay constant f(eta_c) and the transverse size of the wave function, are related to the Fock state probability and the width for the two-photon decay Gamma[eta_c -> gamma gamma]. The Q^2 dependence of the eta_c-gamma transition form factor is well determined.
Cite
@article{arxiv.hep-ph/9709203,
title = {A perturbative approach to the eta_c-gamma transition form factor},
author = {Thorsten Feldmann and Peter Kroll},
journal= {arXiv preprint arXiv:hep-ph/9709203},
year = {2010}
}
Comments
10 pages, uses elsart.cls, epsfig.sty, feynmp.sty