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dc.contributor.authorBlossier, B.
dc.contributor.authorBoucaud, Ph.
dc.contributor.authorBrinet, M.
dc.contributor.authorSoto Borrero, Feliciano Carlos de
dc.contributor.authorLiu, Z.
dc.contributor.authorMorenas, V.
dc.contributor.authorPène, O.
dc.contributor.authorPetrov, K.
dc.contributor.authorRodríguez Quintero, José
dc.identifier.citationBlossier, B., Boucaud, Ph., Brinet, M., Soto Borrero, F.C., Liu, Z., Morenas, V., Pène, O., Petrov, K., Rodríguez Quintero, J.A.: "Renormalization of quark propagators from twisted-mass lattice QCD at N-f=2". Physical Review D. Vol. 83, n. 7, 074506, (2011). DOI:10.1103/PhysRevD.83.074506en_US
dc.identifier.issn2470-0029 (electrónico)
dc.description.abstractWe present results concerning the nonperturbative evaluation of the renormalization constant for the quark field, Z(q), from lattice simulations with twisted-mass quarks and three values of the lattice spacing. We use the regularization-invariant momentum-subtraction (RI'-MOM) scheme. Z(q) has very large lattice spacing artefacts; it is considered here as a test bed to elaborate accurate methods which will be used for other renormalization constants. We recall and develop the nonperturbative correction methods and propose tools to test the quality of the correction. These tests are also applied to the perturbative correction method. We check that the lattice-spacing artefacts indeed scale as a(2)p(2). We then study the running of Z(q) with particular attention to the nonperturbative effects, presumably dominated by the dimension-two gluon condensate < A(2)> in Landau gauge. We show indeed that this effect is present, and not small. We check its scaling in physical units, confirming that it is a continuum effect. It gives a similar to 4% contribution at 2 GeV. Different variants are used in order to test the reliability of our result and estimate the systematic uncertainties. Finally, combining all our results and using the known Wilson coefficient of < A(2)>, we find g(2)(mu(2))< A(2)>(mu 2CM) = 2.01(11)(+0.61-0.73)GeV2 at mu = 10 GeV, the local operator A(2) being renormalized in the (MS) over bar scheme. This last result is in fair agreement within uncertainties with the value independently extracted from the strong coupling constant. We convert the nonperturbative part of Z(q) from the regularization-invariant momentum-subtraction (RI'-MOM) scheme to (MS) over bar. Our result for the quark field renormalization constant in the (MS) over bar scheme is Z(q)((MS) over bar pert) ((2GeV)(2); g(bare)(2)) = 0.750(3)(7) - 0.313(20)(g(bare)(2) - 1.5) for the perturbative contribution and Z(q)((MS) over bar nonperturbative) ((2GeV)(2); g(bare)(2)) 0.781(6)(21) - 0.313(20)(g(bare)(2) - 1.5) when the nonperturbative contribution is included.en_US
dc.publisherAmerican Physical Societyen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.titleRenormalization of quark propagators from twisted-mass lattice QCD at N-f=2en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/Spanish MICINN [FPA2009-10773]en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/Junta de Andalucía [P07FQM02962]

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