Quenched heavy light decay constants

We present results for heavy-light decay constants, using both propagating quarks and the static approximation, in O(a)-improved, quenched lattice QCD. At beta=6.2 on a 24^3x48 lattice we find f_D=185 +4-3(stat)+42-7(syst) MeV, f_B=160 +6-6 +53-19 MeV, f_{D_s}/f_D=1.18 +2-2 and f_{B_s}/f_B=1.22 +4-3, in good agreement with earlier studies. From the static theory we obtain f_B^stat=253 +16-15 +105-14 MeV. We also present results from a simulation at beta=6.0 on a 16^3x48 lattice, which are consistent with those at beta=6.2. In order to study the effects of improvement, we present a direct comparison of the results using both the Wilson and the improved action at beta=6.0.

Note:

32 pages, 8 postscript figures (to be included with epsf), LaTeX, Edinburgh Preprint 93/526 and Southampton Preprint SHEP 92/93-24

gauge field theory: SU(3)
lattice field theory: action
approximation: quenching
approximation: static
quark: propagator
pseudoscalar meson: decay constant
decay constant: pseudoscalar meson
vector meson: decay constant
decay constant: vector meson
numerical calculations: Monte Carlo

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