An Investigation of the Soft Pion Relation in Quenched Lattice QCD
UKQCD Collaboration, K. C. Bowler, C. M. Maynard, L. Lellouch, J. Nieves, D. G. Richards, L. Del Debbio, J. M. Flynn, V. I. Lesk
Abstract
A lattice determination of the form factor and decay constants for the semileptonic decay of heavy pseudoscalar (PS) mesons at zero recoil is presented from which the soft pion relation is satisfied. Chiral extrapolation of the form factor is performed at constant q2. Pole dominance is used to extrapolate the form factor in heavy quark mass. At the B mass, the form factor at zero recoil lies somewhat below the ratio of decay constants; the relation remains satisfied within error.
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