Computation of the strong coupling in QCD with two dynamical flavours

Details Computation of the strong coupling in QCD with two dynamical flavours Computation of the strong coupling in QCD with two dynamical flavours

2004-11-19

arxiv.org/abs/hep-lat/0411025v1

Nucl.Phys. B713 (2005) 378-406

Physics

High Energy Physics

High Energy Physics - Lattice

34 pages including figures and tables, latex2e

Scientific paper

10.1016/j.nuclphysb.2005.02.013

We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.

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