Improved $B \to \pi l \nu_l$ form factors from the lattice

Bowler, K.C.; Maynard, C.M.; Flynn, J.M.; Nieves, J.; Lellouch, L.; Richards, D.G.; Del Debbio, L.; Lesk, V.

doi:10.1016/S0370-2693(00)00754-1

Article
Report number	hep-lat/9911011 ; EDINBURGH-1999-10 ; SHEP-99-12 ; CERN-TH-99-265 ; CPT-99-P-3885 ; LAPTH-757-99 ; JLAB-THY-99-25 ; HEP-99-12 ; CPT-99-P.3885 --LAPTH-757-99 ; CERN-TH-99-265 ; CPT-3885 ; EDINBURGH-99-10 ; HEP-99-12 ; JLAB-THY-99-25 ; LAPP-TH-757
Title	Improved $B \to \pi l \nu_l$ form factors from the lattice
Author(s)	Bowler, K.C. (Edinburgh U.) ; Del Debbio, L. (Southampton U.) ; Flynn, J.M. (Southampton U.) ; Lellouch, L. (CERN) ; Lesk, V. (Southampton U.) ; Maynard, C.M. (Edinburgh U.) ; Nieves, J. (Granada U.) ; Richards, D.G. (Edinburgh U.)
Affiliation	(Univ. Edinburgh) ; (Univ. Southampton) ; (CERN) ; (Univ. Granada)
Collaboration	UKQCD Collaboration
Publication	2000
Imprint	10 Nov 1999
Number of pages	7
Note	Comments: 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 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
In:	Phys. Lett. B 486 (2000) 111-117
DOI	10.1016/S0370-2693(00)00754-1
Subject category	Particle Physics - Lattice
Abstract	We present the results of a lattice computation of the form factors for B to pi l nu_l decays near zero-recoil. These results will allow a model-independent determination of 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 24^3 x 48 lattice at beta=6.2, using a non-perturbatively order a improved action. The masses of all light valence quarks involved are extrapolated to their physical values.
Copyright/License	Elsevier Science B.V.