Computation of the Heavy-Light Decay Constant with NRQCD

Physics – High Energy Physics – High Energy Physics - Lattice

Scientific paper

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3 pages, 4 figures in PostScript format, to appear in the Proceedings of Lattice 93, Dallas, Oct. 1993

Scientific paper

10.1016/0920-5632(94)90412-X

Non-relativistic QCD is applied for a lattice computation of the heavy-light meson decay constant in quenched approximation at $\beta=6.0$. Clear signals are obtained for the ground state at large times in the correlators, allowing a reliable extraction of the decay constant. Estimating the current renormalization factor by the tadpole improvement procedure, we find $f_{B}=$ 164(17) MeV for the $B$ meson with $a^{-1}=$ 2.3 GeV, while an extrapolation to the static limit yields $f_{B}^{\mbox{static}}=$ 247(26) MeV.

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