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Testing the operator product expansion Wilson coefficient for A2 from lattice QCD with a dynamical charm

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Testing the operator product expansion Wilson coefficient for A2 from lattice QCD with a dynamical charm.pdf (1.204Mb)
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http://hdl.handle.net/10433/999
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Authorship
De Soto, Feliciano; Blossier, B.; Boucaud, P.; Brinet, M.; Morenas, V.; [et al.]
Palabras clave
Lattice
Gluon propagators
Ghost propagators
Publication date
2013-04
Abstract
Gluon and ghost propagators, obtained in Landau gauge from lattice simulations with two light two heavy dynamical quark flavors (Nf=2+1+1), are described here with a running formula including a four-loop perturbative expression and a nonperturbative operator product expansion correction dominated by the local operator A2. The Wilson coefficients and their variation as a function of the coupling constant are extracted from the numerical data and compared with the theoretical expressions that, after being properly renormalized, are known at O(¿4). As ¿MS¯¯¯¯¯¯ is also rather well known for Nf=2+1+1, this allows for a precise consistency test of the operator product expansion approach in the joint description of different observables.
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