Abstract
We present preliminary results on the computation of the QCD running coupling constant in the MOM scheme and Landau gauge with two flavours of dynamical Wilson quarks. Gluon momenta range up to about 7 GeV (β = 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/μ 2 correction to the asymptotic behaviour, as in the quenched approximation. We find Λ N f=2 MS = 264(27) MeV × [ a −(5.6, 0.1560)/2.19 GeV], which leads to α 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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