Ghost-gluon coupling, power corrections and MS from twisted-mass lattice QCD at Nf=2
Abstract
A non-perturbative calculation of the ghost-gluon running QCD coupling constant is performed using Nf=2 twisted-mass dynamical fermions. The extraction of MS in the chiral limit reveals the presence of a non-perturbative OPE contribution that is assumed to be dominated by a dimension-two A2 condensate. In this contest a novel method for calibrating the lattice spacing in lattice simulations is presented.
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