Exotic and nonexotic magnetic transitions in the context of the SELEX and GRAAL experiments

2005/03/31 by Hyun-Chul Kim, Maxim Polyakov, Maxim V. Polyakov +5
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.71.094023

published as Phys.Rev. D71 (2005) 094023 · 14 pages, 9 figures. Final version accepted for publication in Phys.Rev.D

arxiv created 2005/05/07 · openalex publication_date 2005/05/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We calculate magnetic transition moments in the chiral quark-soliton model, with explicit SU(3)-symmetry breaking taken into account. The dynamical model parameters are fixed by experimental data for the magnetic moments of the baryon octet and from the recent measurements of \ensuremathΘ⁺ mass. Known magnetic transition moments \ensuremathμ_\ensuremathΛ\ensuremathΣ, \ensuremathμ_N\ensuremathΔ are reproduced and predictions for other octet-decuplet and octet-antidecuplet transitions are given. In particular \ensuremathμ_\ensuremathΣ\ensuremathΣ^* recently constrained by SELEX is shown to be below 0.82\ensuremathμ_N. The recent GRAAL data on \ensuremathη photoproduction off the nucleon are explained in terms of a new narrow antidecuplet neutronlike resonance.

Citations

• Upper limit on the decay Σ(1385)−→Σ−γ and cross section for γΣ−→Λπ−
• Dynamical study of theΔexcitation inN(e,e′π)reactions
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)