Computation of (Lambda)over-bar and lambda(1) with lattice QCD

We pursue a new method, based on lattice QCD, for determining the quantitie s <(Lambda)over bar>, lambda(1), and lambda(2) Or heavy-quark effective the ory. We combine Monte Carlo data for the meson mass spectrum with perturbat ive calculations of the short-distance behavior, to extract <(Lambda)over b ar> and lambda(1) From a formula from HQET. Taking into account uncertainti es from fitting the mass dependence and from taking the continuum limit, we find <(Lambda)over bar> = 0.68(-0.12)(+0.02) GeV and lambda(1) = -(0.45 +/ - 0.12)GeV2 in the quenched approximation. (C) 2000 Elsevier Science B.V. A ll rights reserved.