Author/Authors :
UKQCD Collaboration، نويسنده , , K.C Bowler، نويسنده , , L Del Debbio، نويسنده , , J.M. Flynn، نويسنده , , G.N. Lacagnina، نويسنده , , V.I Lesk، نويسنده , , C.M. Maynard، نويسنده , , D.G. Richards، نويسنده ,
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.
