First results on the running coupling in QCD with two massless flavours

Details First results on the running coupling in QCD with two massless flavours First results on the running coupling in QCD with two massless flavours

2001-05-03

arxiv.org/abs/hep-lat/0105003v2

Phys.Lett.B515:49-56,2001

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, 5 figures, 3 tables, some changes in the data analysis after discovery and correction of an error in Nucl. Phys. B 5

Scientific paper

10.1016/S0370-2693(01)00857-7

We report on the non-perturbative computation of the running coupling of two-flavour QCD in the Schr"odinger functional scheme. The corresponding Lambda-parameter, which describes the coupling strength at high energy, is related to a low energy scale which still remains to be connected to a hadronic ``experimentally'' observable quantity. We find the non-perturbative evolution of the coupling indispensable to avoid untolerable errors in the estimated Lambda-parameter.

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