Nonfactorizable Contributions to B (yields) (pi)(pi) Decays

摘要

We investigate to what extent the experimental information on B (yields) (pi)(pi) branching fractions and CP asymmetries can be used to better understand the QCD dynamics in these decays. For this purpose we decompose the independent isospin amplitudes into factorizable and non-factorizable contributions. The former can be estimated within the framework of QCD factorization for exclusive B decays. The latter vanish in the heavy-quark limit, m(sub b) (yields) (infinity), and are treated as unknown hadronic parameters. We discuss at some length in which way the non-factorizable contributions are treated in different theoretical and phenomenological frameworks.