Ghost-gluon coupling, power corrections and $Λ_{\overline {\rm MS}}$ from twisted-mass lattice QCD at Nf=2

Details Ghost-gluon coupling, power corrections and $Λ_{\overline {\rm MS}}$ from twisted-mass lattice QCD at Nf=2 Ghost-gluon coupling, power corrections and $Λ_{\overline {\rm MS}}$ from twisted-mass lattice QCD at Nf=2

2010-05-28

arxiv.org/abs/1005.5290v1

Physics

High Energy Physics

High Energy Physics - Lattice

33 pages, 6 figs

Scientific paper

We present results concerning the non-perturbative evaluation of the ghost-gluon running QCD coupling constant from $N_f=2$ 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 $\Lambda_{\overline{MS}}$ 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 $\VEV{A^2}$ gluon condensate. The effect due to the dynamical quark mass in the determination of $\Lams$ is discussed.

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