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

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

2002-09-03

arxiv.org/abs/hep-lat/0209023v2

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2002(improve), 3 pages, 2 figures

Scientific paper

10.1016/S0920-5632(03)01579-2

We report on the latest results on the running coupling of two flavour QCD in the Schr\"odinger functional scheme. Results for the step scaling function are obtained from simulations on lattices $L/a=8$ and $L/a=16$ which confirm the first results from lattices $L/a=4,5,6$ presented one year ago by the ALPHA collaboration. We also discuss some algorithmic aspects, in particular concerning the occurrence of metastable states. A modified sampling, in order to estimate the proper weight of these states in the path integral, is proposed and tested.

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