The rare annihilation decays \(\bar{B}^0_{s,d} \to J/\psi\gamma\)

Abstract

Abstract.

We investigate the physics potential of the annihilation decays \(\bar{B}^0_{s,d} \to J/\psi\)\(\gamma\) in the standard model and beyond. In a naive factorization approach, the branching ratios are estimated to be \({\cal B}(\bar{B}^0_s \to J/\psi\gamma) = 1.395\times 10^{-6}\) and \({\cal B}(\bar{B}^0_d \to J/\psi\gamma) = 5.398\times 10^{-8}\). In the framework of QCD factorization, we compute the non-factorizable corrections and get \({\cal B}(\bar{B}^0_s \to J/\psi\gamma) = 5.795\times10^{-8}\), \({\cal B}(\bar{B}^0_d \to J/\psi\gamma) = 2.435\times10^{-9}\). Future measurements of these decays would be useful for testing the factorization frameworks. The smallness of these decays in the SM makes them sensitive probes of new physics. As an example, we will consider the possible admixture of the (V + A) charge current to the standard (V-A) current. This admixture will give a significant contribution to the decays.