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arxiv: hep-ph/9709203 · v1 · submitted 1997-09-01 · ✦ hep-ph

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A perturbative approach to the eta_c-gamma transition form factor

Thorsten Feldmann , Peter Kroll (Wuppertal Univ.)
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classification ✦ hep-ph
keywords c-gammafactorformgammatransitionapproachdecayfunction
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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.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Radiative charmonium decays in a contact-interaction model with dynamical quark anomalous magnetic moment

    hep-ph 2026-04 unverdicted novelty 6.0

    Contact-interaction model with dynamical quark anomalous magnetic moment reproduces lattice QCD results for eta_c to gamma gamma and J/psi to gamma eta_c decays, consistent with 2026 data but not the 2024 measurement.