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Rare radiative leptonic decays B d , s → ℓ + ℓ − γ

2004; American Physical Society; Volume: 70; Issue: 11 Linguagem: Inglês

10.1103/physrevd.70.114028

1550-7998

Dmitri Melikhov, Nikolai Nikitin,

High-Energy Particle Collisions Research

Long-distance QCD effects in ${B}_{d,s}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}\ensuremath{\gamma}$ decays are analyzed. We show that the contribution of the light vector-meson resonances related to the virtual photon emission from valence quarks of the $B$-meson, which was not considered in previous analyses, strongly influences the dilepton differential distribution. Taking into account photon emission from the $b$-quark loop, weak annihilation, and Bremsstrahlung from leptons in the final state, we give predictions for dilepton spectrum in ${B}_{d,s}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}\ensuremath{\gamma}$ decays within the Standard Model.