The observed strong phase difference of 30^{ o} between I=(3/2) and I=(1/2) final states for the decay B to D Pi is analyzed in terms of rescattering like D^{ ∗}Pi to D Pi, etc. It is concluded that for the decay B^{ o}to D^{ +} Pi^{ -} the strong phase is only about 10^{ o}. Implications for the determination of sin(2 Beta + gamma) are discussed.
Categories: hep-ph