ηcγ TRANSITION FORM FACTOR
نویسندگان
چکیده
The ηcγ 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 ηc-meson a distribution amplitude of the Bauer-Stech-Wirbel type is used, where the two free parameters, namely the decay constant fηc and the transverse size of the wave function, are related to the Fock state probability and the width for the two-photon decay Γηc→γγ .
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The ηcγ transition form factor is calculated within a perturbative approach. For the ηc-meson, a wave function of the Bauer-Stech-Wirbel type is used where the two free parameters, namely the decay constant fηc and the transverse size of the wave function, are related to the Fock state probability and the width for the two-photon decay Γ[ηc → γγ]. The Q dependence of the ηcγ transition form fac...
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