منابع مشابه
Role of “Intrinsic Charm” in Semi-Leptonic B-Meson Decays
We discuss the role of so-called “intrinsic-charm” operators in semi-leptonic B-meson decays, which appear first at order 1/mb in the heavy quark expansion. We show by explicit calculation that – at scales μ ≤ mc – the contributions from “intrinsiccharm” effects can be absorbed into short-distance coefficient functions multiplying, for instance, the Darwin term. Then, the only remnant of “intri...
متن کاملLeptonic and semi - leptonic B decays
We present results for the semi-leptonic and leptonic decays of B mesons. These non-perturbative matrix elements are important for constraining the CKM matrix. Results are presented for the pseudoscalar and vector decay constants, as well as flavour breaking ratios and heavy quark symmetry relations. We consider the chiral and momentum dependence of the semi-leptonic form factors of the decay B...
متن کاملStudy of Radiative Leptonic D Meson Decays
We study the radiative leptonic D meson decays of D (s) → lνlγ (l = e, μ, τ), D → νν̄γ and D → llγ (l = e, μ) within the light front quark model. In the standard model, we find that the decay branching ratios of D (s) → eνeγ, D (s) → μνμγ and D (s) → τντγ are 6.9× 10 (7.7× 10), 2.5× 10 (2.6× 10), and 6.0× 10 (3.2× 10), and that of D → llγ (l = e, μ) and D → νν̄γ are 6.3× 10 and 2.7× 10, respectiv...
متن کاملRadiative Leptonic Decays of B c Meson
To the leading order, the radiative leptonic decays Bc → γlν̄ ( l = e, μ ) are studied carefully. In the study, a non-relativistic constituent quark model and the effective Lagrangian for the heavy flavour decays are used. As a result, the branching ratios turn out to be of the orders of 10 for Bc → γμν̄ or for Bc → γeν̄. Based on the study, we point out the decays being accessible experimentally ...
متن کاملCurrent Renormalisation in NRQCD for Semi-leptonic B → D Decays
We present a calculation of the renormalisation constants for the temporal vector current, ZV0 and spatial axial current, ZAk , to O( αs M ) for B → D transitions using the O( 1 M ) NRQCD action for both b and c quarks evaluated for a large range of mass parameters. Considerations for the renormalisation of the spatial vector current and the temporal axial current are discussed and initial resu...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1994
ISSN: 0920-5632
DOI: 10.1016/0920-5632(94)90422-7