Baryon resonances at large Nc, or Quark Nuclear Physics

TL;DR

This paper presents a novel approach to understanding baryon resonances as collective excitations in a mean field, justified at large Nc, and successfully predicts known spectra and new exotic baryons.

Contribution

It introduces a new theoretical framework for baryon resonances based on large Nc QCD, connecting nuclear physics concepts with quark models.

Findings

Good agreement with observed light baryon spectra up to 2 GeV

Predictions of new exotic charmed and bottom baryons

Framework applicable to both light and heavy baryons

Abstract

We suggest a new point of view according to which baryon resonances can be understood as collective excitations about intrinsic one-quark excitations in a mean field of definite symmetry. This approach is justified in the limit of large number of colours Nc, and is similar to the physics of large-A nuclei, hence "quark nuclear physics". Although in the real world Nc is only three, we obtain a good agreement with the observed resonance spectrum of light baryons up to 2 GeV, and of lowest charmed baryon multiplets. A by-product of the scheme is the prediction of new exotic charmed (and bottom) baryons that may be stable against strong decays.