Radiative leptonic decays of heavy mesons in heavy quark limit

Abstract

We study the radiative leptonic decays of heavy mesons within the covariant light-front model. Using this model, both the form factors F_V and F_A have the same form when the heavy quark limit is taken. In addition, the relation between the form factor F_V and the decay constant of heavy meson F_H is obtained. The hadronic parameter βcan be determine by the parameters appearing in the wave function of heavy meson. We find that the value of βis not only quite smaller than the one in the non-relativistic case, but also insensitive to the value of light quark mass m_q. These results mean that the relativistic effects are very important in this work. We also obtain the branching ratio of B\to lν_l γis about (1.40-1.67)\times 10^{-6}, in agreement with the general estimates in the literature.

11 pages, 3 figures

References in corpus (2)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• B meson wave function from the $B\to \gamma l\nu$ decay

Cited by in corpus (4)

• Accumulating evidence for nonstandard leptonic decays of D_s mesons
• Methods for high-precision determinations of radiative-leptonic decay form factors using lattice QCD
• Efficient lattice QCD computation of radiative-leptonic-decay form factors at multiple positive and negative photon virtualities
• Heavy-light quark systems from the QCD instanton vacuum: $N_f=1$ light flavor case