2000
DOI: 10.1103/physrevd.62.093002
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Long-distance effects inBVγradiative weak decays

Abstract: A systematic approach to long-distance effects in exclusive radiative weak B decays is presented, based on a combination of the heavy quark limit with perturbative QCD. The dominant long-distance effects, connected with weak annihilation and W-exchange topologies, can be computed in a model-independent way using experimental data on B radiative leptonic decays. Nonfactorizable corrections vanish in the chiral limit and to leading twist. The left-handed photon amplitudes are shown to be enhanced relative to the… Show more

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Cited by 79 publications
(116 citation statements)
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References 37 publications
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“…This feature is common to inclusive and exclusive radiative decays, also when including long-distance effects in the latter case [2]. While measurements of the inclusive rate agree reasonably well with SM calculations [1], no evidence exists for the helicity of the photons in these decays.…”
supporting
confidence: 56%
“…This feature is common to inclusive and exclusive radiative decays, also when including long-distance effects in the latter case [2]. While measurements of the inclusive rate agree reasonably well with SM calculations [1], no evidence exists for the helicity of the photons in these decays.…”
supporting
confidence: 56%
“…and velocity-dependent form factors h(ω) connected with 4-velocities and not 4-momenta as in (109) in the following way…”
Section: A Meson Transition Amplitudes and Heavy-quark Expansion In Qcdmentioning
confidence: 99%
“…In Fig. 3(a) we illustrate the branching fraction by using [21]. The quantities of interest are S φγ and A ∆Γ .…”
Section: Bs → φγmentioning
confidence: 99%