We discuss the perturbative QCD approach for exclusive non-leptonic two body B-meson decays. We briefly review its ingredients and some important theoretical issues related to the factorization approach. PQCD results are compatible with present experimental data for the charmless B-meson decays. We predict the possibility of large direct CP violation effects in $B^0 \to \pi^{ +}\pi^{ -}$ $(23\pm7 %)$ and $B^0\to K^{ +}\pi^{ -}$ $(-17\pm5%)$. For charmed decay $B \to D^{ (*)}\pi$, we get large non-factorizable contributions for Color-suppressed decays and obtain $|a_2/a_1|\sim 0.4-0.5$ and $Arg(a_2/a_1)\sim -42^{ o}$. In the last section we investigate the method to extract the weak phases $\phi_2$ from $B \to \pi\pi$ decay and $\phi_3$ from $K\pi$ modes. From BaBar measurement of CP asymmetry for the $\pi^{ +}\pi^{ -}$ decay, the prefered CKM weak phases are: $\phi_1=(24\pm2)^{ o}$, $\phi_2=(78\pm 22)^{ o}$ and $\phi_3=(78\pm 22)^{ o}$.
Categories: hep-ph