Ghost-gluon coupling, power corrections and Λ MS from twisted-mass lattice QCD at Nf=2
Blossier, B. · Boucaud, Ph. · De soto, F. · Morenas, V. · Gravina, M. · Pène, O. · Rodríguez-Quintero, J.
Original · EN
We present results concerning the non-perturbative evaluation of the ghost-gluon running QCD coupling constant from Nf=2 twisted-mass lattice calculations. A novel method for calibrating the lattice spacing, independent of the string tension and hadron spectrum is presented with results in agreement with previous estimates. The value of ΛMS is computed from the running of the QCD coupling only after extrapolating to zero dynamical quark mass and after removing a non-perturbative OPE contribution that is assumed to be dominated by the dimension-two A² gluon condensate. The effect due to the dynamical quark mass in the determination of is discussed.
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