Rates and Asymmetries in $B\to K\pi$ Decays

Abstract

We discuss a potential discrepancy in an approximate relation among $B\to K\pi$ rates which, with increased statistical significance, would imply new physics in $\Delta I=1$ transitions. An approximate relation between CP-violating rate differences in $B^0/{\bar{B}}^0\to K^{\pm }{\pi }^{\mp }$ and $B^{\pm }\to K^{\pm }{\pi }^0$ is used to combine these rate differences to reduce upper limits on the two CP asymmetries. These rates and asymmetries are used to update bounds on the CKM phase $\gamma$.

Comments: 11 pages, LaTeX, 3 figures, a reference added, to be published in Phys. Lett. B