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.