The Role of the Roper in QCD

Abstract

We show that existing data suggest a simple scenario in which the nucleon, and the Delta and Roper resonances act as chiral partners in a reducible representation of the full QCD chiral symmetry group. We discuss the peculiar interpretation of this scenario using spin-flavor symmetries of the naive constituent quark model, as well as the consistency of the scenario with large-Nc expectations.

16 pages TeX, uses mtexsis.tex

References in corpus (7)

• Roper Resonance and S_{11}(1535) from Lattice QCD
• Negative Parity 70-plet Baryon Masses in the 1/Nc Expansion
• Excited baryons from Bayesian priors and overlap fermions
• Latest results from lattice QCD for the Roper resonance
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Cited by in corpus (14)

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• Towards a theory of hadron resonances
• Broken Chiral Symmetry on a Null Plane
• The width of the Roper resonance in baryon chiral perturbation theory
• Nuclear Effective Field Theories: Reverberations of the early days
• The Role of the Roper in Chiral Perturbation Theory
• The reaction $\pi N\to \omega N$ in a dynamical coupled-channel approach
• The Roper Resonance in a finite volume
• Electromagnetic transition form factors of the Roper resonance in baryon chiral perturbation theory
• Towards a theory of baryon resonances
• Quartet of spin-3/2 baryons in chiral multiplet $(1,1/2)\oplus (1/2,1)$ with mirror assignment
• Another walk through the world of chiral dynamics
• Pion axioproduction revisited
• Chiral corrections to the Adler-Weisberger sum rule