Decay constants of charm and beauty pseudoscalar heavy-light mesons on fine lattices

Details Decay constants of charm and beauty pseudoscalar heavy-light mesons on fine lattices Decay constants of charm and beauty pseudoscalar heavy-light mesons on fine lattices

2007-01-19

arxiv.org/abs/hep-lat/0701015v2

Phys.Lett.B652:150-157,2007

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 7 figures. Replaced version contains analysis in terms of improved quark masses instead of bare quark masses, result

Scientific paper

10.1016/j.physletb.2007.06.066

We compute decay constants of heavy-light mesons in quenched lattice QCD with a lattice spacing of a ~ 0.04 fm using non-perturbatively O(a) improved Wilson fermions and O(a) improved currents. We obtain f_{D_s} = 220(6)(5)(11) MeV, f_D = 206(6)(3)(22) MeV, f_{B_s} = 205(7)(26)(17) MeV and f_B = 190(8)(23)(25) MeV, using the Sommer parameter r_0 = 0.5 fm to set the scale. The first error is statistical, the second systematic and the third from assuming a +-10% uncertainty in the experimental value of r_0. A detailed discussion is given in the text. We also present results for the meson decay constants f_K and f_\pi and the \rho meson mass.

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