CP Asymmetry in ${\bar{B}}^0\to K^{-}{\pi }^{+}$ from SUSY Flavor Changing Interactions

Abstract

Recently Babar and Belle collaborations have measured direct CP asymmetry $A_{CP}=-0.114\pm 0.020$ in ${\bar{B}}^0\to K^{-}{\pi }^{+}$. The experimental value is substantially different from QCD factorization prediction. We show that SUSY flavor changing neutral current interaction via gluonic dipole can explain the difference. CP asymmetries in other $B\to K\pi$ decays are predicted to be sizeable. Taking this asymmetry as a constraint, we find that the allowed SUSY parameter space is considerably reduced compared with constraint from $B\to X_s\gamma$ alone. We also find that the allowed time dependent CP asymmetries $S_f$ in ${\bar{B}}^0\to {\bar{K}}^{\ast 0}\gamma \to {\pi }^0{K}_S\gamma$ and ${\bar{B}}^0\to \varphi K_S$ to be large. These predictions are quite different than those predicted in the Standard Model and can be tested in the near future.

Comments: RevTeX4, 5 pages, 6 eps figures. Minor changes, conclusions unchanged