Ghost-gluon coupling, power corrections and Λ_MS from twisted-mass lattice QCD at N_f=2

2010/10/27 by Blossier, B., Boucaud, Ph., De soto, F. +4
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.1010.5724

Abstract

A non-perturbative calculation of the ghost-gluon running QCD coupling constant is performed using N_f=2 twisted-mass dynamical fermions. The extraction of Λ_MS in the chiral limit reveals the presence of a non-perturbative OPE contribution that is assumed to be dominated by a dimension-two \VEVA² condensate. In this contest a novel method for calibrating the lattice spacing in lattice simulations is presented.

Related

• OPE and Powers corrections on the QCD coupling constant
• Gluon and Ghost Propagators in Landau Gauge on the Lattice
• Gauge-variant propagators and the running coupling from lattice QCD
• The dimension-two gluon condensate, the ghost-gluon vertex and the Taylor theorem
• Search for 1/p² Corrections to the Running QCD Coupling