A perturbative approach to the etac-gamma transition form factor
Thorsten Feldmann, Peter Kroll
Abstract
The etac-gamma transition form factor is calculated within a perturbative approach. For the etac-meson, a wave function of the Bauer-Stech-Wirbel type is used where the two free parameters, namely the decay constant f(etac) and the transverse size of the wave function, are related to the Fock state probability and the width for the two-photon decay Gamma[etac -> gamma gamma]. The Q2 dependence of the etac-gamma transition form factor is well determined.
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