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Renormalization constants for 2-twist operators in twisted mass QCD
Department of Physics, University of Cyprus.
Department of Physics, University of Cyprus.
Institut fur Physik, Humboldt Universitat zu Berlin.
Department of Physics, University of Cyprus.
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2011 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 83, no 1, 014503Article in journal (Refereed) Published
Abstract [en]

Perturbative and nonperturbative results on the renormalization constants of the fermion field and the twist-2 fermion bilinears are presented with emphasis on the nonperturbative evaluation of the one-derivative twist-2 vector and axial-vector operators. Nonperturbative results are obtained using the twisted mass Wilson fermion formulation employing two degenerate dynamical quarks and the tree-level Symanzik improved gluon action. The simulations have been performed for pion masses in the range of about 450-260 MeV and at three values of the lattice spacing a corresponding to β=3.9, 4.05, 4.20. Subtraction of O(a2) terms is carried out by performing the perturbative evaluation of these operators at 1-loop and up to O(a2). The renormalization conditions are defined in the RI⊃′-MOM scheme, for both perturbative and nonperturbative results. The renormalization factors, obtained for different values of the renormalization scale, are evolved perturbatively to a reference scale set by the inverse of the lattice spacing. In addition, they are translated to MS̄ at 2 GeV using 3-loop perturbative results for the conversion factors

Place, publisher, year, edition, pages
2011. Vol. 83, no 1, 014503
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Other Health Sciences
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Health Science
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URN: urn:nbn:se:ltu:diva-65223DOI: 10.1103/PhysRevD.83.014503Scopus ID: 2-s2.0-79551522973OAI: oai:DiVA.org:ltu-65223DiVA: diva2:1134689
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-11-29Bibliographically approved

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