No abstract

A previous analysis of two-body Cabibbo allowed nonleptonic decays of D 0 mesons and of Cabibbo allowed and first-forbidden decays of D + and D + s has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of D 0 . Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large flavour SU(3) violations. New fitting parameters are necessary to describe rescattering effects for Cabibbo forbidden D 0 decays, given the lack of experimental informations on isoscalar resonances. We keep their number to a minimum -three -using phenomenologically based considerations. We also discuss CP violating asymmetries.

We evaluate the decays B → K * π, K(ρ, ω, φ) adding the long distance charming penguin contributions to the short distance: Tree+Penguin amplitudes. We estimate the imaginary part of the charming penguin by an effective field theory inspired by the Heavy Quark Effective Theory and parameterize its real part. The final results for branching ratios depend on only two real parameters and show a significant role of the charming penguins. The overall agreement with the available experimental data is satisfactory.