Semileptonic B Decays with Nf=2+1 Dynamical Quarks
J. Shigemitsu, C. T. H. Davies, A. Dougall, K. Foley, E. Gamiz, A. Gray, E. Gulez, G. P. Lepage, M. Wingate
Abstract
Semileptonic, B --> pi l,nu, decays are studied on the MILC dynamical configurations using NRQCD heavy and Asqtad light quarks. We work with light valence quark masses ranging between ms and ms/8. Preliminary simple linear chiral extrapolations have been carried out for form factors fpara and fperp at fixed Epi. The chirally extrapolated results for the form factors f+(q2) and f0(q2) are then fit to the Becirevic-Kaidalov (BK) ansatz. Preliminary estimates of the CKM matrix element |Vub| are presented based on the recently published branching fractions for B exclusive semileptonic decays by the CLEO collaboration.
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