Direct CP Violation In Radiative B Decays

We discuss the role of the radiative B decays $B\to X_{s\mathrm{/}d}\gamma$ in our search for new physics focusing on the issue of direct CP violation. We discuss in some detail a SM prediction for the CP asymmetries in inclusive $b\to s\mathrm{/}d$ transitions, namely $\mid \Delta {\cal B}(B \to X_s \gamma) + \Delta {\cal B}(B \to X_d \gamma) \mid \sim 1 \cdot 10^{-9}$. Any measured value in significant deviation of this estimate would indicate new sources of CP violation beyond the CKM phase.