Direct CP Violation in B-+ -> pi-+ omega, pi-+ rho0, pi0 rho-+, and in   B-bar0(B0) -> pi-+ rho+- With an Enhanced Branching Ratio for pi0 rho0
  We present a novel dynamics for generating sizable CP-violating asymmetries in the decays of charged $B^\mp\to \pi^\mp \omega, \pi^\mp\rho^0, \pi^0\rho^\mp$, and in $\bar{B^0}(B^0)\to\pi^\mp\rho^\pm$. The dynamics for the necessary final-state interactions involves the mixing of G-parity eigenstates of the system $(\bar{D}^*D,D^*\ol{D})$ with the $G=\pm 1$ states of $\pi\omega$ and $\pi\rho$, respectively. The dynamical effect is enhanced by the empirically large branching ratio for decays to $(\bar{D}^*D,D^*\bar{D})$. A correlated result is a markedly enhanced branching ratio for $\bar{B^0}(B^0)\to\pi^0\rho^0$, which has now been observed in two experiments. 
Saul Barshay, Georg Kreyerhoff and Lalit M. Sehgal