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A perturbative approach to the eta_c-gamma transition form factor
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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
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The ${\gamma^* \gamma^* \to \eta_c (1S,2S)}$ transition form factors for spacelike photons
The double-virtual gamma*gamma* to eta_c transition form factor is computed from light-front wave functions and is predicted to violate factorization strongly while depending only weakly on the asymmetry of the two ph...
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