Computation of $\barΛ$ and $λ_1$ with Lattice QCD

Details Computation of $\barΛ$ and $λ_1$ with Lattice QCD Computation of $\barΛ$ and $λ_1$ with Lattice QCD

2000-06-29

arxiv.org/abs/hep-ph/0006345v3

Phys.Lett. B490 (2000) 228-235; Erratum-ibid. B495 (2000) 441-442

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pp, 4 figs (in v2 Fig. 4 now shows Ref. 13, as advertised); in v3 error in BLM scale is corrected

Scientific paper

10.1016/S0370-2693(00)01277-6

We pursue a new method, based on lattice QCD, for determining the quantities $\bar{\Lambda}$, $\lambda_1$, and $\lambda_2$ of heavy-quark effective theory. We combine Monte Carlo data for the meson mass spectrum with perturbative calculations of the short-distance behavior, to extract $\bar{\Lambda}$ and $\lambda_1$ from a formula from HQET. Taking into account uncertainties from fitting the mass dependence and from taking the continuum limit, we find $\bar{\Lambda} = 0.68{+0.02}_{-0.12} \text{GeV}$ and $\lambda_1 = -(0.45 \pm 0.12) \text{GeV}^2$ in the quenched approximation.

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