We present results of a lattice analysis of the B parameter B B , the decay constant f B , and several mass splittings using the static approximation. Results were obtained for 60 quenched gauge configurations computed at ϭ6.2 on a lattice size of 24 3 ϫ48. Light quark propagators were calculated using the O(a)-improved Sheikholeslami-Wohlert action. We findcorresponding to B B static ϭ1.02 Ϫ6 Ϫ2 ϩ5 ϩ3 , f B static ϭ266 Ϫ20 Ϫ27 ϩ18 ϩ28 MeV, and f B s 2 B B s / f B 2 B B ϭ1.34 Ϫ8 Ϫ3 ϩ9 ϩ5 , where a variational fitting technique was used to extract f B static . For the mass splittings we obtain M B s ϪM B d ϭ87 Ϫ12 Ϫ12 ϩ15 ϩ6 MeV, M ⌳ b ϪM B d ϭ420 Ϫ90 Ϫ30 ϩ100 ϩ30 MeV, and M B* 2 ϪM B 2 ϭ0.281 Ϫ16 Ϫ37 ϩ15 ϩ40 GeV 2 . We compare different smearing techniques in-tended to improve the signal/noise ratio. From a detailed assessment of systematic effects, we conclude that the main systematic uncertainties are associated with the renormalization constants relating a lattice matrix element to its continuum counterpart. The dependence of our findings on lattice artifacts is to be investigated in the future. ͓S0556-2821͑96͒04715-7͔
We present results for heavy-light decay constants, using both propagating quarks and the static approximation, in O(a)-improved, quenched lattice QCD. At β = 6.2 on a 24 3 ×48 lattice we find f D = 185
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