Factorization and end point singularities in heavy-to-light decays
نویسندگان
چکیده
منابع مشابه
Semi-leptonic decays heavy-light to heavy-light
We present results for the QCD matrix elements involved in semi-leptonic decays of B-mesons into pseudo scalar heavy light states. The application of NRQCD heavy quarks allows for quark masses around the physical b-quark. We investigate the dependence of the form factors on the external momenta and looked at the mass dependence at zero recoil. For the first time, results for radially excited de...
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We show that some Lorentz components of the Feynman integrals calculated in terms of the light-cone variables may contain end-point singularities which originate from the contribution of the big-circle integral in the complex k−-plane. These singularities appear in various types of diagrams (two-point functions, three-point functions, etc) and provide the covariance of the Feynman integrals on ...
متن کاملFactorization and hadronic B decays in the heavy quark limit
Recent theoretical investigations [M. Beneke et al. Phys. Rev. Lett. 83, 1914 (1999)] of two-body hadronic B decays have provided justification, at least to order αs, for the use of the factorization ansatz to evaluate the B decay matrix elements provided the decay meson containing the spectator quark is not heavy. Motivated by this, we present simplified formulae for a wide range of B decays i...
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We propose a QCD-based model for calculation of the non-perturbative corrections to the factorization approximation in the decays of heavy mesons. In the framework of the model, factorization in pseudoscalar transitions holds exactly at the leading order leaving the opportunity to calculate non-leading corrections consistently.
متن کاملSemileptonic decays of heavy-light pseudoscalar mesons
I discuss the results of a recent quenched lattice calculation of the two independent form factors parametrizing the semileptonic decays between heavy-light pseudoscalar mesons. The differential decay rate of the process B → Dℓν has been calculated at non vanishing momentum transfer both in the case of the light leptons ℓ = e, µ and in the case of a non vanishing lepton mass ℓ = τ.
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2003
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.67.071502