منابع مشابه
The Photon-pion Transition Form Factor for Virtual Photons
We discuss the photon to meson transition form factor for virtual photons, which can be measured in ee collisions. We demonstrate that this form factor is independent of the shape of the meson distribution amplitude over a wide kinematical range. This leads to a parameter-free prediction of perturbative QCD to leading twist accuracy, which has a status comparable to the famous leading-twist pre...
متن کاملThe Photon-pion Transition Form Factor for Virtual Photons
We discuss the photon to meson transition form factor for virtual photons, which can be measured in ee collisions. We demonstrate that this form factor is independent of the shape of the meson distribution amplitude over a wide kinematical range. This leads to a parameter-free prediction of perturbative QCD to leading twist accuracy, which has a status comparable to the famous leading-twist pre...
متن کاملηcγ TRANSITION FORM FACTOR
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 F...
متن کاملMeson-photon Transition Form Factors in the Charmonium Energy Range
The study of electron-positron collisions at center-of-mass energies corresponding to charmonium production has reached new levels of sensitivity thanks to experiments by the BES and CLEO Collaborations. Final states γP , where P is a pseudoscalar meson such as π, η, and η can arise either from charmonium decays or in the continuum through a virtual photon: ee → γ → γP . Estimates of this latte...
متن کاملPerturbative pion-photon transition form factors with transverse momentum corrections.
We perform a perturbative QCD analysis of the quark transverse momentum effect on the pion-photon transition form factors Fπγ and Fπγ∗ in the standard light-cone formalism, with two phenomenological models of wavefunction as the input of the non-perturbative aspect of the pion. We point out that the transverse momentum dependence in both the numerator and the denominator of the hard scattering ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2012
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.85.054004