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dc.contributor.authorPapavassiliou, Joannis-
dc.contributor.authorAguilar, Arlene Cristina-
dc.contributor.authorBinosi, D.-
dc.identifier.citationJournal of High Energy Physics 7: 002 (2010)en_US
dc.description.abstractWe use recent lattice data on the gluon and ghost propagators, as well as the Kugo-Ojima function, in order to extract the non-perturbative behavior of two particular definitions of the QCD effective charge, one based on the pinch technique construction, and one obtained from the standard ghost-gluon vertex. The construction relies crucially on the definition of two dimensionful quantities, which are invariant under the renormalization group, and are built out of very particular combinations of the aforementioned Green's functions. The main non-perturbative feature of both effective charges, encoded in the infrared finiteness of the gluon propagator and ghost dressing function used in their definition, is the freezing at a common finite (non-vanishing) value, in agreement with a plethora of theoretical and phenomenological expectations. We discuss the sizable discrepancy between the freezing values obtained from the present lattice analysis and the corresponding estimates derived from several phenomenological studies, and attribute its origin to the difference in the gauges employed. A particular toy calculation suggests that the modifications induced to the non-perturbative gluon propagator by the gauge choice may indeed account for the observed deviation of the freezing values.en_US
dc.description.sponsorshipWe would like to thank A. Cucchieri, T. Mendes, M. Müller-Preussker, and O. Oliveira for kindly making their lattice results available to us, and for their useful comments. The research of J. P. is supported by the European FEDER and Spanish MICINN under grant FPA2008-02878, and the Fundación General of the UV. The work of A.C.A is supported by the Brazilian Funding Agency CNPq under the grant 305850/2009-1.en_US
dc.subjectNonperturbative Effectsen_US
dc.titleQCD effective charges from lattice dataen_US
dc.description.peerreviewedPeer revieweden_US
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