ar X iv : h ep - l at / 0 40 80 19 v 1 1 1 A ug 2 00 4 1 Semileptonic B Decays with N f = 2 + 1 Dynamical Quarks
نویسندگان
چکیده
Semileptonic, B → π lν, 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 f and f ⊥ at fixed Eπ. The chirally extrapolated results for the form factors f+(q 2) and f0(q 2) are then fit to the Becirevic-Kaidalov (BK) ansatz. Preliminary estimates of the CKM matrix element |V ub | are presented based on recently published branching fractions for B 0 → π − l + ν exclusive decays by the CLEO collaboration.
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