Role of electromagnetic dipole operator in the electroweak penguin dominated vector meson decays of $B$ meson

Cai-Dian Lü, Yue-Long Shen, Wei Wang

The pure annihilation type decays $B_d^0\to \varphi \gamma$ and $B_s\to \rho \gamma$ receive only color suppressed penguin contributions with a very small branching ratio in the standard model. When we i…