CP Violating Rate Difference Relations for $B\to PP$ and $B \to PV$ in   Broken SU(3)
  Within the standard model there exist certain relations between CP violating rate differences in B decays in the SU(3) limit. We study SU(3) breaking corrections to these relations in the case of charmless, hadronic, two body $B$ decays using the improved factorization model of Ref.\cite{3}. We consider the cases $B \to PP$ and $B \to PV$ for both $B_d$ and $B_s$ mesons. We present an estimate for $A_{CP}(\pi^- \pi^+)$ in terms of $A_{CP}(K^- \pi^+)$. 
A.D. Dariescu, N.G. Deshpande, X.-G. He and G. Valencia