Heavy-strange meson decay constants in the continuum limit of quenched QCD

Details Heavy-strange meson decay constants in the continuum limit of quenched QCD Heavy-strange meson decay constants in the continuum limit of quenched QCD

2007-10-11

arxiv.org/abs/0710.2201v2

JHEP0802:078,2008

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages including figures and tables, latex2e, uses JHEP3.cls; version published in JHEP, discussion of the continuum limit e

Scientific paper

10.1088/1126-6708/2008/02/078

We improve a previous quenched result for heavy-light pseudoscalar meson decay constants with the light quark taken to be the strange quark. A finer lattice resolution (a ~ 0.05 fm) in the continuum limit extrapolation of the data computed in the static approximation is included. We also give further details concerning the techniques used in order to keep the statistical and systematic errors at large lattice sizes L/a under control. Our final result, obtained by combining these data with determinations of the decay constant for pseudoscalar mesons around the D_s, follows nicely the qualitative expectation of the 1/m-expansion with a (relative) 1/m-term of about -0.5 GeV/m_PS. At the physical b-quark mass we obtain F_{B_s} = 193(7) MeV, where all errors apart from the quenched approximation are included.

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