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Quark propagator at one loop in the refined Gribov-Zwanziger framework

Gustavo P. de Brito1,*, Philipe De Fabritiis2,†, and Antonio D. Pereira3,‡

  • 1Departamento de Física, Universidade Estadual Paulista (Unesp), Campus Guaratinguetá, Avenida Doutor Ariberto Pereira da Cunha, 333, Guaratinguetá, São Paulo, Brazil
  • 2CBPF—Centro Brasileiro de Pesquisas Físicas, Rua Doutor Xavier Sigaud 150, 22290-180, Rio de Janeiro, Brazil
  • 3Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, Avenida Litorânea s/n, 24210-346, Niterói, Rio de Janeiro, Brazil

  • *Contact author: gp.brito@unesp.br
  • †Contact author: pdf321@cbpf.br
  • ‡Contact author: adpjunior@id.uff.br
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Phys. Rev. D 112, 014014 – Published 7 July, 2025

DOI: https://doi.org/10.1103/lds6-34v8

Abstract

The refined Gribov-Zwanziger scenario is a local and renormalizable setup in which infinitesimal Gribov copies are eliminated and further nonperturbative effects are accounted for. The gluon propagator that arises from this framework fits lattice data very well in the Landau gauge. We investigate the coupling of quarks to this setting at one loop order by computing the quark propagator. The fermionic sector is introduced by a minimal coupling and the nonperturbative effects are transmitted to the matter sector through gluonic loops which, in this case, carry information from the elimination of infinitesimal Gribov copies and the formation of condensates. We compare our findings with available lattice data both for the unquenched gluon propagator as well as for the quark propagator in the Landau gauge. Our results are comparable with those obtained in the Curci-Ferrari model at one loop order. In particular, we are able to fit the unquenched gluon propagator and use the fixed parameters to predict the quark mass function and find good agreement with lattice data. However, the quark dressing function does not agree, even at a qualitative level, with lattice data in the infrared. This is agreement with the analog computation in the Curci-Ferrari model. Inspired by the developments in the Curci-Ferrari results, such a disagreement is likely to be cured by the inclusion of two-loop corrections. Finally, we compare the present minimal coupling with a nonperturbative matter coupling proposed in the refined Gribov-Zwanziger literature.

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Phys. Rev. D 112, 014014– Published 7 July, 2025
  • Received 26 May 2025
  • Accepted 13 June 2025
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