Unquenched calculation of alpha_s from Green functions: progress report

Details Unquenched calculation of alpha_s from Green functions: progress report Unquenched calculation of alpha_s from Green functions: progress report

2001-10-12

arxiv.org/abs/hep-ph/0110171v1

Nucl.Phys.Proc.Suppl.106:266-268,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures, Lattice2001 (spectrum)

Scientific paper

10.1016/S0920-5632(01)01684-X

We present preliminary results on the computation of the QCD running coupling constant in the MOM_tilde scheme and Landau gauge with two flavours of dynamical Wilson quarks. Gluon momenta range up to about 7 GeV (beta=5.6, 5.8 and 6.0) with a constant dynamical quark mass. This range already allows to exhibit some evidence for a sizeable 1/mu^2 correction to the asymptotic behaviour, as in the quenched approximation. We find Lambda_MS^(N_f=2) = 264(27) MeV x [a^{-1}(5.6,0.1560)/(2.19 GeV)], which leads to alpha_s(M_Z) = 0.113(3)(4). In view of the systematics error to be controlled, this encouraging result is more a preliminary indication than a real prediction.

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