Semileptonic B Decays with Nf=2+1 Dynamical Quarks

Details Semileptonic B Decays with Nf=2+1 Dynamical Quarks Semileptonic B Decays with Nf=2+1 Dynamical Quarks

2004-08-11

arxiv.org/abs/hep-lat/0408019v1

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 1 figure. Contribution to Lattice'04 (heavy quarks)

Scientific paper

10.1016/j.nuclphysbps.2004.11.12

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 m_s and m_s/8. Preliminary simple linear chiral extrapolations have been carried out for form factors f_para and f_perp at fixed E_pi. The chirally extrapolated results for the form factors f_+(q^2) and f_0(q^2) are then fit to the Becirevic-Kaidalov (BK) ansatz. Preliminary estimates of the CKM matrix element |V_{ub}| are presented based on the recently published branching fractions for B exclusive semileptonic decays by the CLEO collaboration.

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