CPviolatingb→sγdecay in supersymmetric models

Supersymmetric models with nonuniversal squark masses can enrich the chiral structure and $\mathrm{CP}$ violating phenomena in $\overrightarrow{b}s\gamma$ decays. Direct $\mathrm{CP}$ violation in $\overrightarrow{b}s\gamma$ decay, mixing induced $\mathrm{CP}$ violation in radiative $B_{d,s}$ decays (such as $B_s\to \phi \gamma$ and $B_d\to K_{1,2}^{*}\gamma )$, and $\Lambda$ polarization in ${\Lambda }_b\to \Lambda \gamma$ decay can be substantially different from the standard model. Future experiments at $e^{+}{e}^{-}$ and hadronic B factories will give important information on the underlying couplings for radiative b decays.