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

B. Blossier; F. de Soto; J. Rodr\'iguez-Quintero; M. Gravina; O. P\`ene; Ph. Boucaud; V. Morenas

arxiv: 1010.5724 · v1 · pith:QWTFEB3Ynew · submitted 2010-10-27 · ✦ hep-lat

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

B. Blossier , Ph. Boucaud , F. de Soto , V. Morenas , M. Gravina , O. P\`ene , J. Rodr\'iguez-Quintero This is my paper

classification ✦ hep-lat

keywords latticecouplingghost-gluonlambdanon-perturbativetwisted-massassumedcalculation

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

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

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