Strong decay of low-lying $S_{11}$ and $D_{13}$ nucleon resonances to pseudoscalar mesons and octet baryons

TL;DR

This paper investigates the decay widths of specific nucleon resonances into pseudoscalar mesons and octet baryons using a chiral constituent quark model, considering configuration mixing and strangeness contributions, and compares results with experimental data.

Contribution

It provides new calculations of decay widths and coupling constants for nucleon resonances, incorporating configuration mixing and strangeness effects within a chiral quark model.

Findings

Experimental data well reproduced by the model.

Predictions for coupling constants relevant to meson production.

Configuration mixing significantly affects decay widths.

Abstract

Partial decay widths of the nucleon resonances $S_{11}(1535)$, $S_{11}(1650)$, $D_{13}(1520)$ and $D_{13}(1700)$ to the pseudoscalar mesons and octet baryons are studied within a chiral constituent quark model. The effects of the configurations mixing between the states $|N^{2}_{8}P_{M}>$ and $|N^{4}_{8}P_{M}>$ are considered, taking into account the breakdown of the $SU(6)\otimes O(3)$ symmetry. In addition, possible contributions of the strangeness components in the $S_{11}$ resonances are investigated. Experimental data for the partial decay widths of the $S_{11}$ and $D_{13}$ resonances are well reproduced. Predictions for coupling constants of the four nucleon resonances to pseudoscalar mesons and octet baryons, crucial issues in the photo- and hadron-induced meson production reactions, are reported.