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

Citation
As. Kronfeld et Jn. Simone, Computation of (Lambda)over-bar and lambda(1) with lattice QCD, PHYS LETT B, 490(3-4), 2000, pp. 228-235
Citations number
60
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → ACNP
Volume
490
Issue
3-4
Year of publication
2000
Pages
228 - 235
Database
ISI
SICI code
0370-2693(20001005)490:3-4<228:CO(ALW>2.0.ZU;2-6
Abstract
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.