Role of Electromagnetic Dipole Operator in the Electroweak Penguin Dominated Vector Meson Decays of B Meson

The pure annihilation type decays ⁰_d→ϕγ and B_s→ργ receive only colour suppressed penguin contributions with a very small branching ratio in the standard model. When we include the previously neglected electromagnetic dipole operator, the branching ratios can be enhanced to (⁰_d→ϕγ)≃1×10⁻¹¹ and (B_s→ργ)~(6−16)×10⁻¹⁰, which are one order magnitude larger than previous study using the QCD factorization approach. The new effect can also give a large contribution, of order 10⁻⁹, to transverse polarization of B→ϕρ and B→ωϕ, which is comparable to the longitudinal part. These effects can be detected in the LHCb experiment and the super-B factories.