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One-loop RG improvement of the screened massive expansion in the Landau gauge

Giorgio Comitini* and Fabio Siringo†

  • Dipartimento di Fisica e Astronomia dell’Università di Catania, INFN Sezione di Catania, Via S. Sofia 64, I-95123 Catania, Italy

  • *giorgio.comitini@dfa.unict.it
  • †fabio.siringo@ct.infn.it
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Phys. Rev. D 102, 094002 – Published 5 November, 2020

DOI: https://doi.org/10.1103/PhysRevD.102.094002

Abstract

The RG improvement of the screened massive expansion is studied at one loop in two renormalization schemes, the momentum subtraction (MOM) scheme and the screened momentum subtraction scheme. The respective Taylor-scheme running couplings are shown not to develop a Landau pole, provided that the initial value of the coupling is sufficiently small. The improved ghost and gluon propagators are found to behave as expected, displaying dynamical mass generation for the gluons and the standard UV limit of ordinary perturbation theory. In the MOM scheme, when optimized by matching with the fixed-coupling framework, the approach proves to be a powerful method for obtaining propagators, which are in excellent agreement with the lattice data already at one loop. After optimization, the gluon mass parameter is left as the only free parameter of the theory and is shown to play the same role of the ordinary perturbative QCD scale ΛQCD.

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Phys. Rev. D 102, 094002– Published 5 November, 2020
  • Received 9 July 2020
  • Accepted 19 October 2020
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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