{pi}K interaction effects on CP violation in B (right arrow) K {pi} {sup + }{pi}{ sup -} decays.

The authors apply QCD factorization to the quasi two-body B {yields} (K{pi}){pi} decays where the (K{pi})-pair effective mass is limited to 1.8 GeV. Our strong interaction phases constrained by theory and {pi}K experimental data yield useful information for studies of CP violation.