Determining the weak phase γ using the decays Bd, B+→ Kη( η′) and Bs→ πη( η′)

Abstract

We suggest two methods (based on flavor SU(3) symmetry) to determine the CKM angle γ using the decays B d , B +→ Kη( η′) and B s → πη( η′), respectively. Rescattering effects are partly included – we neglect annihilation amplitudes, but do not assume any other relation between the SU(3) invariant amplitudes. We use the fact that the amplitude (including the Electroweak Penguin contribution) for B d , B +→ πK with final state I(isospin)=3/2 is known as a function of γ from the decay rate B +→ π 0 π +.