A Quark-Meson Model for Heavy Mesons: Semi-Leptonic Decays
Abstract
Description
I consider a model for heavy meson decays based on an effective quark-meson Lagrangian. The model is constrained by the known symmetries of QCD in the m_Q -> infinity limit for the heavy quarks, and chiral symmetry in the light quark sector. Using a limited number of free parameters it is possible to compute several phenomenological quantities, e.g. the leptonic B and B** decay constants; the Isgur-Wise form factors: xi, tau(3/2), tau (1/2), describing the semi-leptonic decays B -> D(*) l nu, B -> D** l nu; the form factors for heavy to light decays B -> rho l nu, B -> a_1 l nu. I show that the semileptonic heavy-to-light form factors calculated in the model fulfill the general relations that hold in QCD in the large energy limit for the final hadron.
Contribution to the Proceedings of the XXXIVth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Les Arcs 1800, France, March 20-27, 1999
Contribution to the Proceedings of the XXXIVth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Les Arcs 1800, France, March 20-27, 1999