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2010-11-19 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Buisseret Fabien , Lacroix Gwendolyn , "A minimal quasiparticle approach for the QCD and its large-Nc limits" in European Physical Journal C. Particles and Fields, 70, 1051-1060

  • Edition : Springer (Germany)
  • Codes CREF : Physique des particules élémentaires (DI1221)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)
Texte intégral :

Abstract(s) :

(Anglais) We propose a quasiparticle approach allowing to compute the equation of state of a generic gauge theory with gauge group SU(Nc) and quarks in an arbitrary representation. Our formalism relies on the thermal quasiparticle masses (quarks and gluons) computed from perturbative techniques, in which the standard two-loop running coupling constant is used. Our model is minimal in the sense that we do not allow any extra ansatz concerning the temperature-dependence of the running coupling. We first show that it is able to reproduce the most recent equations of state computed on the lattice for temperatures typically higher than 2Tc. Well above Tc indeed, an ideal-gas framework with thermal masses is expected to be relevant. Then we study the accuracy of various inequivalent large-Nc limits concerning the description of the QCD results, as well as the equivalence between the QCDAS limit and the N = 1 SUSY Yang–Mills theory.

Identifiants :
  • DOI : 10.1140/epjc/s10052-010-1497-x
  • arXiv : 1006.0655