M. Gravina

Ghost-gluon coupling, power corrections and Λ MS from twisted-mass lattice QCD at N f = 2

We present results concerning the non-perturbative evaluation of the ghost-gluon running QCD coupling constant from

Alpha_s from Lattice QCD: progresses and perspectives for a realistic full-QCD determination of the running Strong coupling

N_f=2

Vacuum expectation value of A 2 from LQCD.

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

Ghost-gluon coupling, power corrections and

\Lambda_{\overline{MS}}

\Lambda_{\bar{\rm MS}}

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

from lattice QCD with a dynamical charm

\VEV{A^2}

Ghost-gluon coupling, power corrections, and ^MS¯¯¯¯¯ from lattice QCD with a dynamical charm

gluon condensate. The effect due to the dynamical quark mass in the determination of

twisted-mass QCD

\Lams

RI/MOM renormalization constants (N_f=4) and the strong coupling constant (N_f=2+1+1) from twisted-mass QCD

is discussed.

Ghost-gluon coupling, power corrections and

from the lattice, afterapplying the appropriate lattice-artefacts curing procedure, confronted to the continuum formula obtainedfrom PT and including OPE non-perturbative corrections. The solid line is for the complete non-perturbativeexpression, while dotted stands only for the perturbative four-loop one,α