B ->pi rho, pi omega decays in perturbative QCD approach

We calculate the branching ratios and CP-asymmetries for B-0 -->pi(+)p(-), B-0 --> p(+)pi(-), B+ --> p(+) pi(0), B+ --> pi(+)p(0), B-0 --> pi(0)p(0), B+ --> pi(+)omega and decays, in the perturbative QCD approach. In this approach, we calculate non-factorizable and annihilation type. contributions, in addition to the usual factorizable contributions. Our result is in agreement with the branching ratio of B-0/B-0 --> pi(+/-)p(+/-), B+/- --> pi(+/-)p(0), pi(+/-)omega measured by the CLEO and BABAR collaborations. We also predict large CP-asymmetries in these decays. These channels are useful to determine the CKM angle phi(2).