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2020-03-23 - Article/Dans un journal avec peer-review - Anglais - 3 page(s)

Buisseret Fabien , Semay Claude , "Meson spectrum in SU(N) gauge theories with quarks in higher representations: A check of Casimir scaling hypothesis" in Results in Physics, 17, 103057

  • Edition : Elsevier, Amsterdam (Netherlands)
  • Codes CREF : Physique des particules élémentaires (DI1221), Physique théorique et mathématique (DI1210)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)
Texte intégral :

Abstract(s) :

(Anglais) Gauge theories with gauge group SU(N) and quarks belonging to arbitrary representations of SU(N) form a rich landscape of QCD-like theories, whose study can shed new light on the properties of confinement. Four cases are particularly worth of interest: quarks in the fundamental representation, quarks in the 2-indice (anti)symmetric representation and quarks in the adjoint representation. The last three corresponding QCD-like theories are equivalent at large-N for bosonic observables: It is the orientifold equivalence. The behavior of the lightest vector meson mass versus N has been studied in quenched lattice QCD in the chiral limit in these theories. We show that the observed behaviors are compatible with a string tension proportional to the quadratic Casimir of SU(N) in the quark color representation, i.e. with the Casimir scaling hypothesis. The large-N limit of some excited meson masses computed in quenched lattice QCD with quarks in the fundamental representation is also shown to be compatible with QCD string's well-known signature: Regge trajectories.

Identifiants :
  • arXiv : 1911.04864
  • DOI : 10.1016/j.rinp.2020.103057

Mots-clés :
  • (Anglais) Large-N QCD
  • (Anglais) Orientifold equivalence
  • (Anglais) Vector meson