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

Using the perturbative QCD approach, we studied the effects from hadronic structure of photon on the pure annihilation rediative decays $B\toϕγ$ and $B_s\to(ρ^0,ω)γ$. These decays have small branching fractions due to the power suppression by the $Λ/m_B$, which make them very sensitive to the next-leading 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 $B\to ϕγ$ even increases by about 40 times, and those of $B_s \to ρ^0γ$ and $B_s \to ωγ$ are at the order of ${\cal O}(10^{-10})$. We also note that the ratio of branching fractions of $B_s \to ρ^0γ$ and $B_s \to ωγ$ is very sensitive to the effects from hadronic structure of photon. All above results could be tested in future.