Weak phases gamma and alpha from B+, or B-0 and B-s decays

An improved flavor SU(3) method is presented for determining the weak angle gamma of the unitarity triangle using decay rates for B+ --> K pi,B+ --> K +(K) over bar(0) and B+ --> pi(+) eta (Or B-0 --> K pi and B-s --> K pi), t heir CP-conjugate modes and the CP-averaged rate for B+/- --> pi(+/-)pi(0). Rescattering (color-suppressed) contribution in B+(B-0) --> K pi is subtra cted away. The only significant SU(3) breaking effects are accounted for in the factorization approximation of tree amplitudes. The weak angle a is ob tained as a byproduct. (C) 1999 Elsevier Science B.V. All rights reserved.