Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, LaTeX (sprocl.sty, h-physrev.bst, 2 ps-figures incl.), Talk presented at Photon'97, Egmond (NL), May 97 (to appear in
Scientific paper
The eta_c-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 eta_c-meson a distribution amplitude 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].
Feldmann Th.
Kroll Peter
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