Rare Radiative B Decays at LHCb

Precise measurements on rare radiative $B$ decays are performed with the LHCb experiment at LHC. The best results to date regarding the ration of branching fractions for two radiative decays, $B_d \to K^*\gamma$ and $B_s \to \phi \gamma$, and the direct $CP$ asymmetry in $B_d \to K^*\gamma$ decay channel are reported, using 0.37 fb$^{-1}$ and 1 fb$^{-1}$ of experimental data, respectively.