The Running Coupling From Lattice QCD

Details The Running Coupling From Lattice QCD The Running Coupling From Lattice QCD

1993-11-05

arxiv.org/abs/hep-lat/9311009v1

Physics

High Energy Physics

High Energy Physics - Lattice

Wuppertal preprint WUB 93-37, 22 pages + 8 figures, LaTeX with epsf-postscript figures (ca. 350 MB)

Scientific paper

A recent lattice calculation of the QCD running coupling is presented. The coupling is extracted from the force between two static quarks in the framework of the valence quark approximation. A value of the Lambda-parameter for zero quark flavours is determined: Lambda_msbar=0.630(38)\sqrt{\sigma} =293(18)^{+25}_{-63} MeV. The first error is statistical, the second stems from the overall scale uncertainty in the string tension sigma. Combining this value with results from full QCD lattice simulations, we end up with the estimate $\Lambda^{(4)}_{\overline{MS}}=129(8)^{+43}_{-60}$~MeV or $\alpha_{\overline{MS}}(m_Z)=0.102^{+06}_{-11}$.

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