Title: 
Semileptonic B Decays: status and perspectives

Speaker: 
Dr. Marcello Rotondo, INFN Padova

Abstract: 
The semileptonic decays of hadrons with beauty, allow to mesaure
the magnitude of two elements of the Cabibbo-Kobayashi-Maskawa quark
mixing matrix: Vub and Vcb. These parameters are crucial inputs to the
so called Unitarity Triangle Fits. Both Vub and Vcb parameters can
be extracted from inclusive B decays, where the final states is not
fully reconstructed, and from exclusive processes, where one specific
final state is analysed. The theoretical frameworks and the
experimental techniques needed to exploit the two approaches are
very different and
complementary. Despite the great theoretical efforts and the
many experimental measurements provided by the B-Factories in the
last decades, a discrepancy between inclusive and exclusive
determinations of about 3 sigma resists many checks for both Vub and
Vcb. The solution of this puzzle is an high priority in the present
and future flavour physics programs. I will review the status of the
Vub and Vcb determinations and I will discuss the
experimental opportunities at LHCb that has recently shown 
great capabilities on this field through the measurement of the rate of
the baryonic semileptonic decay Lambda_b --> p mu nu.