New Bound on gamma from B+- -> pi K Decays
Abstract
A bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B+- -> pi+- K0 and B+- -> pi0 K+-. The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B+- -> pi+- K0 and B0 -> pi-+ K+- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cos(gamma) around 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle.
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