Lattice Determination of Heavy-Light Decay Constants

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30 November 1998

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 81 (22) , 4812-4815
https://doi.org/10.1103/physrevlett.81.4812

Abstract

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_{- 9 - 0}^{+ 25 + 23} MeV

,

f_{B_{s}} / f_{B} = 1.11 \pm 0.0 2_{- 0.03}^{+ 0.04} \pm 0.03

,

f_{D_{s}} = 210 \pm 9_{- 9 - 1}^{+ 25 + 17} MeV

, and

f_{B} / f_{D_{s}} = 0.75 \pm 0.0 3_{- 0.02 - 0.00}^{+ 0.04 + 0.08}

, where the errors are statistical, systematic (within the quenched approximation), and systematic (of quenching), respectively.

Keywords

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This publication has 18 references indexed in Scilit:

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