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A Determination of the Lambda Parameter from Full Lattice QCD

M. Göckeler·R. Horsley·A. C. Irving·D. Pleiter·P. E. L. Rakow·G. Schierholz·H. Stüben
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Abstract

We present a determination of the QCD parameter Lambda in the quenched approximation (n_f=0) and for two flavours (n_f=2) of light dynamical quarks. The calculations are performed on the lattice using O(a) improved Wilson fermions and include taking the continuum limit. We find Lambda_{n_f=0} = 259(1)(20) MeV and Lambda_{n_f=2} = 261(17)(26) MeV}, using r_0 = 0.467 fm to set the scale. Extrapolating our results to five flavours, we obtain for the running coupling constant at the mass of the Z boson alpha_s(m_Z) = 0.112(1)(2). All numbers refer to the MSbar scheme.

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M. Göckeler, R. Horsley, A. C. Irving, D. Pleiter, P. E. L. Rakow, G. Schierholz, H. Stüben. 2005-02-22. A Determination of the Lambda Parameter from Full Lattice QCD. https://doi.org/10.1103/physrevd.73.014513

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