The Running Coupling From Lattice QCD
Abstract
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 Lambdaparameter 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 $\alpha_{\overline{MS}}(m_Z)=0.102^{+06}_{11}$.
 Publication:

arXiv eprints
 Pub Date:
 November 1993
 arXiv:
 arXiv:heplat/9311009
 Bibcode:
 1993hep.lat..11009B
 Keywords:

 High Energy Physics  Lattice
 EPrint:
 Wuppertal preprint WUB 9337, 22 pages + 8 figures, LaTeX with epsfpostscript figures (ca. 350 MB)