%0 Journal Article
%A de Soto, Feliciano
%A Blossier, B.
%A Boucaud, P.
%A Brinet, M.
%A Du, X.
%A Gravina, M.
%A Morenas, V.
%A Pène, O.
%A Petrov, K.
%A Rodríguez-Quintero, J.
%T Ghost-gluon coupling, power corrections, and ^MS¯¯¯¯¯ from lattice QCD with a dynamical charm
%D 2012
%@ 1550-7998
%U http://hdl.handle.net/10433/1000
%X This paper is a first report on the determination of ^MS¯¯¯¯¯¯ from lattice simulations with 2+1+1 twisted-mass dynamical flavors via the computation of the ghost-gluon coupling renormalized in the MOM Taylor scheme. We show this approach allows a very good control of the lattice artefacts and confirm the picture from previous works with quenched and Nf=2 twisted-mass field configurations, which prove the necessity to include nonperturbative power corrections in the description of the running. We provide an estimate of ¿MS¯¯¯¯¯¯ in very good agreement with experimental results. To our knowledge, it is the first calculation with a dynamical charm quark which makes the running up to ¿s(MZ) much safer.
%K Ghost-gluon coupling
%K Lattice
%~