Predictions for the etac-gamma transition form factor
Abstract
The etac-gamma transition form factor is calculated in a model based on a modified hard scattering approach to exclusive reactions, in which transverse degrees of freedom are taken into account. For the etac-meson a distribution amplitude 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].
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