arXiv:hep-lat/0007020·v3·High Energy Physics — Lattice
Decay Constants of B and D Mesons from Non-perturbatively Improved Lattice QCD
K.C. Bowler🇬🇧 · L. Del Debbio🇬🇧 · J.M. Flynn🇬🇧 · G.N. Lacagnina🇬🇧 · V.I. Lesk🇬🇧 · C.M. Maynard🇬🇧 · D.G. Richards🇬🇧
Abstract
The decay constants of B, D and K mesons are computed in quenched lattice QCD at two different values of the coupling. The action and operators are O(a) improved with non-perturbative coefficients. The results are f_B=195(6)(+24/-23) MeV, f_D=206(4)(+17/-10) MeV, f_B_s=220(6)(+23/-28) MeV, f_D_s=229(3)(+23/-12) MeV and f_K= 150(3)(+12/-8) MeV. Systematic errors are discussed in detail. Results for vector decay constants, flavour symmetry breaking ratios of decay constants, the pseudoscalar-vector mass splitting and D meson masses are also presented.
Comments: Major revision, using new values of improvement coefficients, the scale set by f_pi, and an extended analysis. 37 Pages, 14 figures. Accepted for publication in NPB