Photon distribution amplitudes and light-cone wave functions in chiral quark models
نویسندگان
چکیده
منابع مشابه
Transition form factors and light cone distribution amplitudes of pseudoscalar mesons in the chiral quark model
It is shown that a chiral quark model of the Nambu–Jona-Lasinio type can be used to describe ”soft”-momenta parts of the amplitudes with large momentum transfer. As a sample, the processes γ∗ → γ(π, η, η′) where one of the photons, γ∗, has large spacelike virtuality is investigated. The γ∗ → γ(π, η, η′) transition form factors are calculated for a wide region of transferred momenta. The results...
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Recently systematic methods based on the QCD factorization have been developed for the exclusive B meson decays into light mesons (for other approaches see). Essential ingredients in this approach are the light-cone distribution amplitudes for the participating mesons, which constitute nonperturbative long-distance contribution to the factorized amplitudes. For the light mesons (π, K, ρ, K, etc...
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Leading-twist distribution amplitudes (DAs) of light mesons like π, ρ etc. describe the leading nonperturbative hadronic contributions to exclusive QCD reactions at large energy transfer, for instance electromagnetic form factors. They also enter B decay amplitudes described in QCD factorisation, in particular nonleptonic two-body decays. Being nonperturbative quantities, DAs cannot be calculat...
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We use a simple, instanton motivated, nonlocal chiral quark model to calculate pion Generalized Distribution Amplitudes (GDAs). The nonlo-cality appears due to the momentum dependence of the constituent quark mass, which we take in a form of a generalized dipole formula. With this choice all calculations can be performed directly in the Minkowski space and the sensitivity to the shape of the cu...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2006
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.74.054023