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

doi:10.1103/PhysRevD.73.014513

A Determination of the Lambda Parameter from Full Lattice QCD

High Energy Physics - Phenomenology 2008-11-26 v2 High Energy Physics - Lattice

Authors: M. Göckeler , R. Horsley , A. C. Irving , D. Pleiter , P. E. L. Rakow , G. Schierholz , H. Stüben

View on arXiv ↗ PDF ↗ DOI ↗

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.

Keywords

lattice qcd qcd coupling constant quark masses

Cite

@article{arxiv.hep-ph/0502212,
  title  = {A Determination of the Lambda Parameter from Full Lattice QCD},
  author = {M. Göckeler and R. Horsley and A. C. Irving and D. Pleiter and P. E. L. Rakow and G. Schierholz and H. Stüben},
  journal= {arXiv preprint arXiv:hep-ph/0502212},
  year   = {2008}
}

Comments

25 pages, 9 figures

A Determination of the Lambda Parameter from Full Lattice QCD

Abstract

Keywords

Cite

Comments

Related papers