%0 Journal Article
%A de Soto, Feliciano
%A Blossier, B.
%A Boucaud, P.
%A Morenas, V.
%A Gravina, M.
%A Pène, O.
%A Rodríguez-Quintero, J.
%T Ghost-gluon coupling, power corrections, and ^MS¯¯¯¯¯ from twisted-mass lattice QCD at Nf=2
%D 2010
%@ 1550-7998
%U http://hdl.handle.net/10433/1001
%X We present results concerning the nonperturbative 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 ^MS¯¯¯¯¯¯ is computed from the running of the QCD coupling only after extrapolating to zero dynamical quark mass and after removing a nonperturbative operator-product expansion 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  ^MS¯¯¯¯¯¯ is discussed.
%K Ghost-gluon coupling
%K Lattice
%~