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Baryon resonances in large Nc QCD

N. Matagne* and Fl. Stancu†

N. Matagne*

  • Service de Physique Nucléaire et Subnucléaire, University of Mons, Place du Parc, B-7000 Mons, Belgium

Fl. Stancu†

  • University of Liège, Institute of Physics B5, Sart Tilman, B-4000 Liège 1, Belgium

  • *Nicolas.Matagne@umons.ac.be
  • †fstancu@ulg.ac.be
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Rev. Mod. Phys. 87, 211 – Published 10 March, 2015

DOI: https://doi.org/10.1103/RevModPhys.87.211

Abstract

The current status and open challenges of large Nc QCD baryon spectroscopy are reviewed. After introducing the 1/Nc expansion method, the latest achievements for the ground state properties are revisited. Next the applicability of this method to excited states is presented using two different approaches with their advantages and disadvantages. Selected results for the spectrum and strong and electromagnetic decays are described. Also further developments for the applicability of the method to excited states are presented, based on the qualitative compatibility between the quark excitation picture and the meson-nucleon scattering picture. A quantitative comparison between results obtained from the mass formula of the 1/Nc expansion method and quark models brings convincing support to quark models and the implications of different large Nc limits are discussed. The SU(6) spin-flavor structure of the large Nc baryon allows a convenient classification of highly excited resonances into SU(3) multiplets and predicts mass ranges for the missing partners.

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Rev. Mod. Phys. 87, 211– Published 10 March, 2015
  • Received 30 May 2014

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