Nucleon Resonances Near 2 GeV

Abstract

The nucleon resonances near 2 GeV are investigated through the $Σ$(1385) and $Λ(1520)$ photoproductions within a Regge-plus-resonance approach based on the new experimental data released by the CLAS Collaboration. The $Δ(2000)$ and the $N(2120)$ are found essential to reproduce the experimental data and should be assigned as second $[Δ5/2^+]$ and third $[N3/2^-]$ in the constituent quark model, respectively. A calculation of the binding energy and decay pattern supports that the $N(1875)$, which is listed in the PDG as the third $N3/2^-$ nucleon resonance instead of the $N(2120)$, is from the $Σ(1385)K$ interaction rather than a three quark state.

Talk given at the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015), Osaka, May 2015