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2010-06-16 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Matagne Nicolas, Stancu F., "New look at the [70,1-] nonstrange and strange baryons in the 1/N_c expansion" in Physical Review. D, Particles and Fields, 81, Issue 11, 116002 (10 p.)

  • Edition : American Physical Society, Lancaster (PA)
  • Codes CREF : Physique des particules élémentaires (DI1221)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)
Texte intégral :

Abstract(s) :

(Anglais) Using group theory arguments we extend and complete our previous work by deriving all SU(6) exact wave functions associated to the spectrum of mixed symmetric baryon states $[N_c-1,1]$ in the $1/N_c$ expansion. The extension to SU(6) enables us to study the mass spectra of both strange and nonstrange baryons, while previous work was restricted to nonstrange baryons described by SU(4). The wave functions are specially written in a form to allow a comparison with the approximate, customarily used wave functions, where the system is separated into a ground state core and an excited quark. We show that the matrix elements of the flavor operator calculated with the exact wave functions acquire the same asymptotic form at large $N_c$, irrespective of the spin-flavor multiplet contained in $[N_c-1,1]$, while with the approximate wave function one cannot obtain a similar behaviour. The isoscalar factors of the permutation group of $N_c$ particles derived here can be used in any problem where a given fermion system is described by the partition $[N_c-1,1]$, and one fermion has to be separated from the rest.

Identifiants :
  • arXiv : 1011.5758