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 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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