Study of Charmless Inclusive Semileptonic B Decays and Measurement of the CKM Matrix Element |Vub| with the BaBar Detector

por Virginia Azzolini (IFIC Valencia)

martes 29 abr. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

In the Standard Model the element |V_{ub}| of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix plays a critical role in tests of the prediction of CP violation. In this seminar, it will be presented a measurement of partial branching fractions for inclusive charmless semileptonic decays, B -> Xu l nu in limited regions of phase space and the corresponding values of |V_{ub}|, as extracted using several theoretical calculations. The analysis is based on a sample of 383 million Y(4S) decays into B Bbar pairs collected with the BaBar detector at the PEP-II e+ e- storage rings. Events selection uses either the invariant mass M_X of the hadronic system, the invariant mass squared, q^2, of the lepton and neutrino pair, the kinematic variable P_+ or one of their combinations.