A minimal quasiparticle approach for the QCD and its large-Nc limits

[en] 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.

Disciplines :

Physics

Author, co-author :

Buisseret, Fabien ; Université de Mons > Faculté des Sciences > FS - Service du Doyen ; Université de Mons > Faculté des Sciences > Physique nucléaire et subnucléaire

Lacroix, Gwendolyn

Language :

English

Title :

A minimal quasiparticle approach for the QCD and its large-Nc limits

Publication date :

19 November 2010

Journal title :

European Physical Journal C. Particles and Fields

ISSN :

1434-6044

Publisher :

Springer, Germany

Volume :

Pages :

1051-1060

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

S824 - Physique nucléaire et subnucléaire

Available on ORBi UMONS :

since 21 December 2010

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