Weak phases γ and α from B+, or B0 and Bs decays

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 B0→Kπ and Bs→Kπ), their CP-conjugate modes and the CP-averaged rate for B±→π±π0. Rescattering (color-suppressed) contribution in B+(B0)→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.