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

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

1999-11-09

arxiv.org/abs/hep-lat/9911011v3

Phys.Lett. B486 (2000) 111-117

Physics

High Energy Physics

High Energy Physics - Lattice

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

Scientific paper

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.

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