B meson decay constant from quenched Lattice QCD

Details B meson decay constant from quenched Lattice QCD B meson decay constant from quenched Lattice QCD

1997-11-19

arxiv.org/abs/hep-lat/9711041v1

Physics

High Energy Physics

High Energy Physics - Lattice

10 pages, 4 figures

Scientific paper

A lattice QCD calculation of the B meson decay constant is presented. In order to investigate the scaling violation associated with the heavy quark, parallel simulations are carried out employing both Wilson and the O(a)-improved clover actions for the heavy quark. The discretization errors due to the large $b$ quark mass are estimated in a systematic way with the aid of the non-relativistic interpretation approach of El-Khadra, Kronfeld and Mackenzie. As our best value from the quenched simulations at $\beta$=5.9, 6.1 and 6.3 we obtain $f_B$=163$\pm$16 MeV and $f_{B_s}$=175$\pm$18 MeV in the continuum limit where the error includes both statistical and systematic uncertainties.

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