The renormalized B-meson light-cone distribution amplitude
نویسندگان
چکیده
منابع مشابه
Renormalization-group evolution of the B-meson light-cone distribution amplitude.
An integro-differential equation governing the evolution of the leading-order B-meson light-cone distribution amplitude is derived. The anomalous dimension in this equation contains a logarithm of the renormalization scale, whose coefficient is identified with the cusp anomalous dimension of Wilson loops. The exact solution of the evolution equation is obtained, from which the asymptotic behavi...
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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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We give a complete re-analysis of the leading twist quark-antiquark light-cone distribution amplitudes of longitudinal and transverse mesons. We derive Wandzura-Wilczek type relations between diierent distributions and update the coeecients in their confor-mal expansion using QCD sum rules including next-to-leading order radiative corrections. We nd that the distribution amplitudes of quarks in...
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The B-meson distribution amplitude is calculated using QCD sum rules. In particular we obtain an estimate for the integral relevant to exclusive B-decays λB = 460± 110 MeV at the scale 1 GeV. A simple QCD-motivated parametrization of the distribution amplitude is suggested. ∗Unite Mixte de Recherche du CNRS (UMR 8627)
متن کاملModels for Light-Cone Meson Distribution Amplitudes
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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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2003
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjcd/s2003-03-127-0