Semi-inclusive B decays: from perturbative QCD to data

por Giancarlo Ferrera (Universita di Roma La Sapienza)

viernes 12 may. 2006 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

We discuss the semi-inclusive decays of heavy flavors in the framework of threshold resummation. We focalize on the radiative B decays and on the semileptonic B decays, discussing both analogies and differences. In particular, we show that most spectra in semileptonic decays do not have the same long-distance structure with respect to each other and to the photon spectrum in the radiative decay. We present a model for next-to-next-to-leading logarithm (NNLL) resummed threshold form factors based on the analytic QCD coupling. Through this model we can reproduce, with good accuracy, all known measured spectra without introducing any ad-hoc non-perturbative component.