Running alpha(s) from Landau-gauge gluon and ghost correlations

Understand

We estimate the running coupling constant of the strong interactions within the nonperturbative framework of lattice QCD in Landau gauge.

• Our calculation is based on the ghost-gluon vertex which in the particular case of Landau gauge allows for a definition of alpha(s) in a MOM scheme solely in terms of the gluon and ghost dressing functions.
• As a first step we investigate the zero and two-flavour case and report here on preliminary results.