On the nature of the and from their behavior in chiral dynamics

2008/04/08 by L. Roca, Tetsuo Hyodo, T. Hyodo +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/j.nuclphysa.2008.05.014

published as Nucl.Phys.A809:65-87,2008 · 29 pages, 8 figures

arxiv created 2008/04/08 · openalex publication_date 2008/06/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29

Abstract

We study the behavior with the number of colors (N_c) of the Λ(1405) and Λ(1670) resonances obtained dynamically within the chiral unitary approach. The leading order meson-baryon interaction, used as the kernel of the unitarization procedure, manifests a nontrivial N_c dependence of the flavor SU(3) representation for baryons. As a consequence, the SU(3) singlet (or KN) component of the Λ(1405) states remains bound in the large N_c limit, while the other components dissolve into the continuum. Introducing explicit SU(3) breaking, we obtain the N_c dependence of the excitation energy, masses and widths of the physical Λ(1405) and Λ(1670) resonance. The N_c behavior of the decay width is found to be different from the general counting rule for a qqq state, indicating the dynamical origin of these resonances.

Citations

• Photoproduction of K∗ for the study of Λ(1405)
• Chiral unitary mesonâbaryon dynamics in the presence of resonances: elastic pionânucleon scattering
• Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the σ, f0(980), a0(980) scalar mesons
• Study of Exotic Hadrons ins-Wave Chiral Dynamics
• Nature of Light Scalar Mesons from their Large-NcBehavior
• The Octet Model and its Clebsch-Gordan Coefficients
• Is Θ+(1540) a kaon–skyrmion resonance?
• Chiral perturbation theory to one loop
• Another look atππscattering in the scalar channel
• LargeNcWeinberg-Tomozawa interaction and negative paritys-wave baryon resonances
• Remarks onNcDependence of Decays of Exotic Baryons
• N/Ddescription of two meson amplitudes and chiral symmetry
• Negative-parity baryon spectrum in quenched anisotropic lattice QCD
• Chiral perturbation theory: Expansions in the mass of the strange quark
• Λ(1405)production in theπ−p→K0πΣreaction
• A planar diagram theory for strong interactions
• Spin-flavor structure of largeNcbaryons
• Chiral Dynamics in Nucleons and Nuclei
• Tables of Clebsch-Gordan Coefficients of S U 3
• Phenomenological Lagrangians

Cited by

• The nature of Λ(1405) hyperon resonance in chiral dynamics