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

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

2005-03-23

arxiv.org/abs/hep-ph/0503237v2

Phys.Rev. D71 (2005) 094023

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 9 figures. Final version accepted for publication in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.71.094023

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 $\Theta^{+}$ mass. Known magnetic transition moments $\mu_{\Lambda\Sigma}$, $\mu_{N\Delta}$ are reproduced and predictions for other octet-decuplet and octet-antidecuplet transitions are given. In particular $\mu_{\Sigma\Sigma^{\ast}}$ recently constrained by SELEX is shown to be below $0.82 \mu_N$. The recent GRAAL data on $\eta$ photoproduction off the nucleon are explained in terms of a new narrow antidecuplet neutron-like resonance.

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