A Determination of the Lambda Parameter from Full Lattice QCD

Details A Determination of the Lambda Parameter from Full Lattice QCD A Determination of the Lambda Parameter from Full Lattice QCD

2005-02-22

arxiv.org/abs/hep-ph/0502212v2

Phys.Rev.D73:014513,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 9 figures

Scientific paper

10.1103/PhysRevD.73.014513

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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