Ali Khan, A. and Braun, Vladimir M. and Burch, Tommy and Göckeler, Meinulf and Lacagnina, G. N. and Schäfer, Andreas and Schierholz, Gerrit
Decay constants of charm and beauty pseudoscalar heavy–light mesons on fine lattices.
Physics Letters B 652 (2-3), pp. 150-157.
We compute decay constants of heavy–light mesons in quenched lattice QCD with a lattice spacing of asimilar, equals0.04 fm using non-perturbatively O(a) improved Wilson fermions and O(a) improved currents. We obtain fDs=220(6)(5)(11) MeV, fD=206(6)(3)(22) MeV, fBs=205(7)(26)(17) MeV and fB=190(8)(23)(25) MeV, using the Sommer parameter r0=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 r0. A detailed discussion is given in the text. We also present results for the meson decay constants fK and fπ and the ρ meson mass.