Effects from Hadronic Structure of Photon on $B\toϕγ$ and $B_s\to(ρ^0,ω)γ$ Decays

Abstract

Using the perturbative QCD approach, we studied the effects from hadronic structure of photon on B → φγ and B s → (ρ 0 , ω)γ decays, which are called the pure annihilation rediative decays. These decays have small branching fractions due to the power suppression by the Λ/m B , which make them very sensitive to the nextleading power corrections. The quark components and the related two-particle distribution amplitudes of a final state photon are introduced. The branching fractions can be enhanced remarkably by the factorizable and nonfactorizable emission diagrams. The branching fraction of B → φγ even increases by about 40 times, and those of B s → ρ 0 γ and B s → ωγ are at the order of O(10 −10 ). We also note that the ratio of branching fractions of B s → ρ 0 γ and B s → ωγ is very sensitive to the effects from hadronic structure of photon. All above results could be tested in future.