Relation between Light Cone Distribution Amplitudes and Shape Function in B mesons

por Lluis Oliver (Laboratoire de Physique Théorique, Université de Paris-Sud)

martes 23 sept. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

The Light Cone Distribution Amplitudes (LCDA) with a heavy quark play an important role in a number of aspects of B decays, that we will review. There is a great variety of ansatze or predictions for these LCDA in the litterature. We propose to predict them by a relations to the Shape Function (SF) of B mesons. This is done within a class of covariant quark models that exhibit Isgur-Wise scaling. The SF parameters can be extracted from the B->X_s+gamma spectrum and give a prediction for the LCDA. The results for the latter are compared with the recent measurements by BaBar and with other theoretical approaches.