New Relations for Excited Baryons in Large-NcQCD

2003/01/24 by Thomas D. Cohen, Richard F. Lebed · 2 citations
Physics and Astronomy · #Atomic physics #Baryon #Excited state #High-Energy Particle Collisions Research #Meson #Multiplet #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Spectral line #hep-ph

paper · pdf · doi:10.1103/physrevlett.91.012001

published as Phys.Rev.Lett. 91 (2003) 012001 · 4 pages, no figures, ReVTeX 4. Includes new discussion of previous work on excited baryon towers

arxiv created 2003/01/24 · openalex publication_date 2003/07/02 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We show that excited baryons in large-N_c QCD form multiplets, within which masses are first split at O(1/N_c). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/N_c order exclusively to \ensuremathη\mathrm\text\ensuremath-N rather than \ensuremathπ\mathrm\text\ensuremath-N, and vice versa for the N(1650). This multiplet structure is reproduced by a simple large-N_c quark model, well studied in the literature, that describes resonances as single-quark excitations.

Citations

• Excited baryons in largeNcQCD reexamined: The resonance picture versus single-quark excitations
• Baryon hyperfine mass splittings large N QCD
• 1/Nccorrections to theSU(4)csymmetry forL=1baryons: The three towers
• Hyperfine mass splittings of baryons containing a heavy quark in large N QCD
• Spin-flavor structure of largeNcbaryons
• Light quark spin-flavor symmetry for baryons containing a heavy quark in large N QCD
• Photoproduction ofl=1baryons: Quark model versus largeNcQCD

Cited by

• The large Nc baryon–meson It=Jt rule holds for three flavors
• SU(3) flavor symmetry breaking in large Nc excited hyperons