Lattice Determination of Heavy-Light Decay Constants

Details Lattice Determination of Heavy-Light Decay Constants Lattice Determination of Heavy-Light Decay Constants

1998-06-18

arxiv.org/abs/hep-ph/9806412v2

Phys.Rev.Lett.81:4812-4815,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 included figures. We adjust the perturbative correction calculated by Kuramashi to take into account the fact that

Scientific paper

10.1103/PhysRevLett.81.4812

We report on the MILC collaboration's calculation of $f_B$, $f_{B_s}$, $f_D$, $f_{D_s}$, and their ratios. Our central values come from the quenched approximation, but the quenching error is estimated from $N_F=2$ dynamical staggered lattices. We use Wilson light valence quarks and Wilson and static heavy quarks. We find, for example, $f_B=157 \pm 11 {}^{+25}_{-9} {}^{+23}_{-0} \MeV$, $f_{B_s}/f_B = 1.11 \pm 0.02 {}^{+0.04}_{-0.03} \pm 0.03$, $f_{D_s} = 210 \pm 9 {}^{+25}_{-9} {}^{+17}_{-1} \MeV$ and $f_{B}/f_{D_s} = 0.75 \pm 0.03 {}^{+0.04}_{-0.02} {}^{+0.08}_{-0.00}$, where the errors are statistical, systematic (within the quenched approximation), and systematic (of quenching), respectively.

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