New narrow nucleon resonances $N^{\ast}(1685)$ and $N^{\ast}(1726)$ within the chiral quark-soliton model

TL;DR

This paper models the properties and decay widths of the narrow nucleon resonances $N^{ ext{*}}(1685)$ and $N^{ ext{*}}(1726)$ using the SU(3) chiral quark-soliton framework, providing insights into their masses, decay ratios, and production channels.

Contribution

It presents a detailed theoretical analysis of the decay widths and production likelihoods of the $N^{ ext{*}}(1685)$ and $N^{ ext{*}}(1726)$ resonances within the chiral quark-soliton model, including new mass and decay ratio predictions.

Findings

Masses of the resonances are approximately 1690 MeV and 1720 MeV.

Decay width ratios explain the neutron anomaly and production channels.

The decay widths vary significantly between the two resonances.

Abstract

We investigate the strong and radiative decay widths of the narrow nucleon resonances $N^*(1685)$ and $N^{\ast}(1726)$ within the framework of the SU(3) chiral quark-soliton model. All the relevant parameters are taken from those used to describe the properties of the baryon octet and decuplet in previous works. The masses of the antidecuplet nucleon and the eikosiheptaplet (27-plet) nucleon with spin 3/2 are determined respectively to be $(1690.2\pm 10.5)\, \mathrm{MeV}$ and $(1719.6\pm7.4)\,\mathrm{MeV}$. The decay width for $N^{\ast}(1685)\to \eta + N$ is found to be approximately three times larger than that for $N^{\ast}(1685)\to \pi +N$. The width of the decay $N^{\ast}\left(1726\right)3/2^+\to \eta +N$ is even about 31 times larger than that of $N^{\ast}\left(1726\right)3/2^+\to \pi + N$. The ratio of the radiative decays for $N^*(1685)$ is obtained to be $\Gamma_{nn^*(1685)}/\Gamma_{pp^*(1685)}=8.62\pm3.45$ which explains very well the neutron anomaly. In contrast, we find $\Gamma_{pp^*(1726)}/\Gamma_{nn^*(1726)}=3.72\pm0.64$, which indicates that the production of $N^*(1726)$ is more likely to be observed in the proton channel. We also examined the decay modes of these narrow nucleon resonances with the strangeness hadrons involved.