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A non-perturbative calculation of the ghost-gluon running QCD couplingconstant is performed using $N_f=2$ twisted-mass dynamical fermions. Theextraction of $\Lambda_{\bar{MS}}$ in the chiral limit reveals the presence ofa non-perturbative OPE contribution that is assumed to be dominated by adimension-two $\VEV{A^2}$ condensate. In this contest a novel method forcalibrating the lattice spacing in lattice simulations is presented.

Ghost-gluon coupling, power corrections and $\Lambda_{\bar{MS}}$ from twisted-mass lattice QCD at $N_f=2$