Effects from Hadronic Structure of Photon on $B\to \varphi \gamma$ and $B_s\to ({\rho }^0,\omega )\gamma$ Decays

Abstract

Using the perturbative QCD approach, we studied the effects from hadronic structure of photon on the pure annihilation rediative decays $B\to \varphi \gamma$ and $B_s\to ({\rho }^0,\omega )\gamma$. These decays have small branching fractions due to the power suppression by the $\Lambda /m_B$, 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 $B\to \varphi \gamma$ even increases by about 40 times, and those of $B_s\to {\rho }^0\gamma$ and $B_s\to \omega \gamma$ are at the order of $\mathcal{O}(10^{-10})$. We also note that the ratio of branching fractions of $B_s\to {\rho }^0\gamma$ and $B_s\to \omega \gamma$ is very sensitive to the effects from hadronic structure of photon. All above results could be tested in future.

Comments: 9 pages, 1 figure, to be published in Chinese Physics C