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

The pure annihilation type decays B⁰_d→phiγ 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 R( B⁰_d→Фγ)\simeq 1×10^-11 and R(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→Фρ and B→ωФ, which is comparable to the longitudinal part. These effects can be detected in the LHCb experiment and the super-B factories.