Perturbative corrections to factorization in [formula omitted] decay

Abstract

The amplitudes for processes like B → Dπ − and B → D ∗π − are dominated by factorizable contributions wh relate these amplitudes to the semileptonic form factors in B → De v e and B → D ∗ e v e . Factorization, together w heavy quark symmetry, leads to absolute predictions for ratios of decay rates. For example, Γ( B → Dπ −) Γ( B → D ∗π − ) = 1 . We calculate perturbative strong interaction corrections to factorization and discuss their influence on the ration of decay rates Γ( B → Dπ −)/Γ( B → D ∗π −) . The decays B → Dϱ − and B → D ∗ϱ − are also discussed.