Non-perturbatively Improved Heavy-Light Mesons: Masses and Decay Constants
Abstract
We present a study of the heavy-light spectrum and of the D- and B-meson decay constants. The results wer e obtained in the quenched approximation, by using the non-perturbatively improved Clover lattice action at beta=6.2, with a sample of 100 configurations, on a 243 x 64 lattice. After a careful analysis of th e systematic errors present in the extraction of the physical results, by assuming quite conservative discretization errors, we find fDs=231 +/- 12+6-1 MeV, fD = 211 +/- 14+0-12 MeV, fDs/fD=1.10(2), fBs = 204 +/- 16+28-0 MeV, fB = 179 +/- 18+26-9 MeV, fBs/fB=1.14(3)+0-1. Our results, which have smaller discretization errors than many previous estimates at fixed value of the lattice spacing a, support a large value of fB in the quenched approximation.
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