Decay Constants of B and D Mesons from Non-perturbatively Improved Lattice QCD
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 fB=195(6)(+24/-23) MeV, fD=206(4)(+17/-10) MeV, fBs=220(6)(+23/-28) MeV, fDs=229(3)(+23/-12) MeV and fK= 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.
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