Direct CP violation of B meson via rho-omega interference

We investigate $B^{\pm,0}\rightarrow \rho^0 (\omega )h^{\pm,0}$, where $\rho^0 (\omega)$ decays to $\pi^+\pi^-$ and $h$ is any hadronic final states, such as $\pi$ or $K$. We find large direct $CP$ asymmetries via $\rho-\omega$ interference. A possible determination of the weak phases, such as $\phi_2={\rm arg}((V_{ud}V^*_{ub})/(V_{td}V^*_{tb}))$ and $\phi_3={\rm arg}((V_{us}V^*_{ub})/(V_{ts}V^*_{tb}))$, is also discussed. We show the feasibility to detect the CP asymmetries in these channels by assuming an asymmetric $e^+e^-$ collider experiment. $10^{9}$ $B\bar B$ events are required for the detection of this effect.