Abstract
An improved flavor SU(3) method is presented for determining the weak angle γ of the unitarity triangle using decay rates for B +→ Kπ, B +→ K +( K bar) 0 and B +→ π + η (or B 0→ Kπ and B s → Kπ), their CP-conjugate modes and the CP-averaged rate for B ±→ π ± π 0. Rescattering (color-suppressed) contribution in B +( B 0)→ Kπ is subtracted away. The only significant SU(3) breaking effects are accounted for in the factorization approximation of tree amplitudes. The weak angle α is obtained as a byproduct.
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