Effects of New Physics on CP Violation in B Decays

Abstract

We discuss two models with 1 extra CP phase in $b\leftrightarrow s$ transition. The CP phase $\arg (V_{t^{\prime }s}{V}_{t^{\prime }b})$ with fourth generations, previously ignored, could impact on $b\to s{\ell }^{+}{\ell }^{-}$, $\Delta m_{B_s}$ and $\sin 2{\Phi }_{B_s}$, but does not affect EM and strong penguins. With SUSY at TeV scale, a right-handed ``${\widetilde{sb}}_1$'' squark can be driven light by flavor mixing. It does not affect $b\to s{\ell }^{+}{\ell }^{-}$, but can generate $S_{\varphi K_S}<0$ while giving $S_{{\eta }^{\prime }{K}_S}\sim \sin 2{\Phi }_{B_d}\cong 0.74$. $B_s$ mixing and $\sin 2{\Phi }_{B_s}$ would likely be large, and $S_{K_S{\pi }^0\gamma }\ne 0$ in $B^0\to K^{\ast 0}\gamma$ is promising.

Comments: 3 pages, 3 figures. Talk presented at EPS2003 Conference, Aachen, Germany, July 2003