منابع مشابه
Semileptonic Form Factors
I report the current status of the heavy-light decay constants, the bag parameters and the semileptonic form factors. I compare the heavy-light decay constants with Wilson-Wilson and clover-clover fermions. Systematic errors such as scale setting and renormalization factors are also discussed. 1/M dependences for the heavy-light semi-leptonic form factors near q = q m ax with clover-clover and ...
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Theoretical approaches to form factors of semileptonic decays are discussed in application to B → D + l + ν̄l decay. HQET AND SEMILEPTONIC FORM FACTORS ARKADY VAINSHTEIN Theoretical Physics Institute, University of Minnesota and Budker Institute of Nuclear Physics, Novosibirsk Theoretical approaches to form factors of semileptonic decays are discussed in application to B → D + l + ν̄l decay. 1 Ou...
متن کاملKaon semileptonic decay form factors in two - flavor QCD
We present a calculation of the kaon form factors in two-flavor QCD with the non-perturbatively O(a)-improved Wilson quark action. In order to achieve a few percent accuracy in the study of SU(3) breaking effects, we use a set of double ratios of the matrix elements, with which the bulk of the statistical fluctuation and the multiplicative renormalization factors cancel. c Copyright owned by th...
متن کاملAnalyticity, shapes of semileptonic form factors
We give a pedagogical discussion of the physics underlying dispersion relation-derived parameterizations of form factors describing B → πlν̄ and B → Dlν̄. Moments of the dispersion relations are shown to provide substantially tighter constraints on the f+(t) form factor describing B̄ → πlν than the unweighted dispersion relation alone. Heavy quark spin symmetry relations between the B → πlν̄ and B ...
متن کاملForm Factors of Semileptonic M L3 Decays *
We study in detail the kinematics of semileptonic M l3 (M → M ′ lν) decay, considering only the new models preserving all the gauge symmetries of the Standard Model (SM), and assuming that neutrinos are massless and left-handed as in the SM. And we present a brief review of the recent theoretical progress on model independent constraints on the form factors of M l3 decays using dispersion relat...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1992
ISSN: 0031-9007
DOI: 10.1103/physrevlett.68.2887