Heavy-Light Decay Constants from Wilson and Static Quarks

Details Heavy-Light Decay Constants from Wilson and Static Quarks Heavy-Light Decay Constants from Wilson and Static Quarks

1997-09-29

arxiv.org/abs/hep-lat/9709142v1

Nucl.Phys.Proc.Suppl.63:362-364,1998

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, LaTeX with espcrc2.sty and epsf.tex, 1 included postscript figure. Poster presented by C. Bernard at LATTICE '97, Edi

Scientific paper

10.1016/S0920-5632(97)00770-6

MILC collaboration results for \fB, \fBs, \fD, \fDs and their ratios are presented. These results are still preliminary, but the analysis is close to being completed. Sources of systematic error, both within the quenched approximation and from quenching itself, are estimated. We find, for example, $f_B=153\pm 10 {}^{+36}_{-13} {}^{+13}_{-0} MeV$, and $f_{B_s}/f_B = 1.10 \pm 0.02 {}^{+0.05}_{-0.03} {}^{+0.03}_{-0.02}$, where the errors are statistical, systematic (within the quenched approximation), and systematic (of quenching), respectively. The extrapolation to the continuum and the chiral extrapolation are the largest sources of error. Present central values are based on linear chiral extrapolations; a shift to quadratic extrapolations would raise $f_B$ by $\approx20$ MeV and make the error within the quenched approximation more symmetric.

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