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αs from the ghost-gluon vertex in Landau gauge

Presenter: Andre Sternbeck — CSSM, The University of Adelaide

A. Sternbeck, E.-I. Ilgenfritz, D.B. Leinweber, K. Maltman, M. Mueller-Preussker, L. von Smekal, A.G. Williams

We calculate the running coupling constant of the strong interaction 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 αs in a MOM scheme solely in terms of the gluon and ghost dressing functions. We investigate different numbers of flavor and give estimates for αs(mZ) and Λ in the MS scheme.