Improved B -> pi l nu_l form factors from the lattice

Abstract

We present the results of a lattice computation of the form factors for B^0 ->pi^- l^+nu_l decays near zero-recoil. These results will allow a determination of the CKM matrix element |Vub| when measurements of the differential decay rate become available. We also provide models for extrapolation of the form factors and rate to the full recoil range. Our computation is performed in the quenched approximation to QCD on a 24^3x48 lattice at beta=6.2, using a non-perturbatively O(a)-improved action. The masses of all light valence quarks involved are extrapolated to their physical values.

8 Pages, 4 colour figures, Accepted for Publication in Phys.Lett.B. Typset in REVTeX 3.1 added figure and table with minor text modification

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• Chiral symmetry and O(a) improvement in lattice QCD
• Massive Fermions in Lattice Gauge Theory
• Non-perturbative quark mass renormalization in quenched lattice QCD
• Heavy-to-Light Form Factors in the Final Hadron Large Energy Limit of QCD
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• Precision computation of the strange quark's mass in quenched QCD
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• An ``Improved" Lattice Study of Semi-leptonic Decays of D-Mesons
• Short-Distance Expansion of Heavy-Light Currents at Order 1/m
• Lattice study of $B\to \pi$ semileptonic decay using nonrelativistic lattice QCD
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• Probing with Penguins: A lattice calculation of the branching ratio for some of the exclusive modes of $b\to s\gamma$
• Decays of Heavy Mesons
• B -> pi l nu at three lattice spacings
• Semi-leptonic decays of heavy mesons

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