Threshold resummation in heavy flavour physics: from perturbative QCD to data

by B. Desplanques

Tuesday 5 Dec 2006, 00:00 → 00:00 Europe/Paris

Salle 149 (LPSC)

Séminaire théorie par Giancarlo FERRERA (Université de Rome). Résumé: We discuss threshold resummation in semi-inclusive heavy-flavour decays and in heavy-flavour fragmentation. We focalize on the radiative and semileptonic B decays and on the b-quark fragmentation, discussing both analogies and differences. To deal with the large non-perturbative effects, we introduce a model for NNLL-resummed form factors based on an effective QCD coupling, which does not exhibit the Landau pole. Through this model, and without introducing any ad-hoc non-perturbative component, we can reproduce with good accuracy most experimental data on decays and fragmentation.