Diagonal form factors and heavy-heavy-light three-point functions at weak coupling
نویسندگان
چکیده
منابع مشابه
Weak Form Factors for Heavy Meson Decays
We calculate the form factors for weak decays of B(s) and D(s) mesons to light pseudoscalar and vector mesons within a relativistic dispersion approach based on the constituent quark picture. This approach gives the form factors as relativistic double spectral representations in terms of the wave functions of the initial and final mesons. The form factors have the correct analytic properties an...
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Heavy-to-light meson form factors at large recoil can be described using the same techniques as for hard exclusive processes involving only light hadrons. Two competing mechanisms appear in the large-recoil regime, describing so-called “soft-overlap” and “hard-scattering” components of the form factors. It is shown how existing experimental data from B and D decays constrain the relative size o...
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Recently, Stech found form factor relations for heavy to light transitions based on two simple dynamical assumptions for spectator partical. In this work we generalize his approach to the case of baryons and find that for ΛQ → Λ (Q=b or c) only one independent form factor remains in limit mQ → ∞. Furthermore, combining with the model of Guo and Kroll we determine both of the two form factors fo...
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We propose a simple parametrization for the form factors in heavy to light decays which satisfies the heavy quark scaling laws and avoids introducing the explicit “dipole” form. The illustration is provided on the set of lattice data for B → π semileptonic decay. The resulting shape of the form factor also agrees with the QCD sum rule predictions. ∗Unité Mixte de Recherche C7644 du Centre Natio...
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We reanalyze B ! D and B ! KJ= data to extract a set of parameters which give the relevant hadronic matrix elements in terms of factorized amplitudes. Various sources of theoretical uncertainties are studied, in particular those depending on the model adopted for the form factors. We nd that the t to the B ! D branching ratios substantially depends on the model describing the Isgur-Wise functio...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2015
ISSN: 1029-8479
DOI: 10.1007/jhep09(2015)125