Decay Constants of B and D Mesons from Non-perturbatively Improved Lattice QCD

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  • 17 July 2000
Abstract
The decay constants of B and D 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 where available. The results are f_B=218(5)(+5/-41) MeV, f_D=220(3)(+24/-3) MeV, f_B_s=242(4)(+13/-48) MeV, f_D_s=241(2)(+7/-30) 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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