M Decays

While the factorization assumption works well for many two-body nonleptonic B meson decay modes, the recent measurement of B̄ → D(∗)0M0 with M = π, ρ and ω shows large deviation from this assumption. We analyze the B → D(∗)M decays in the perturbative QCD approach based on kT factorization theorem, in which both factorizable and nonfactorizable contributions can be calculated in the same framework. Our predictions for the Bauer-Stech-Wirbel parameters, |a2/a1| = 0.43±0.04 and Arg(a2/a1) ∼ −42◦ and |a2/a1| = 0.47 ± 0.05 and Arg(a2/a1) ∼ −41◦, are consistent with the observed B → Dπ and B → D∗π branching ratios, respectively. It is found that the large magnitude |a2| and the large relative phase between a2 and a1 come from color-suppressed nonfactorizable amplitudes. Our predictions for the B̄0 → D(∗)0ρ0, D(∗)0ω branching ratios can be confronted with future experimental data. [email protected] [email protected] [email protected] [email protected] [email protected] Mailing address