Exploring the Weak Phase gamma in B^+- -> pi K Decays

Abstract

Measurements of the rates for the hadronic decays B^+- -> pi K along with the CP-averaged B^+- -> pi^+- pi^0 branching ratio can be used to bound and extract the weak phase gamma=-arg(V_ub). Using preliminary CLEO data, we obtain the bounds |gamma|>93 degrees at 1 sigma, and |gamma|>71 degrees at 90 % confidence level.

6 pages, 1 figure, contains new results (!); invited talk at the 17th International Conference on Weak Interactions and Neutrinos, Cape Town, South Africa, 24-30 January 1999