Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons

TL;DR

This paper investigates the properties of the N*(1895) resonance and its effects on hyperon photoproduction, proposing the existence of a new isovector state, Sigma(1400), and analyzing its implications for experimental studies.

Contribution

It introduces the potential existence of Sigma(1400), studies its photoproduction, and examines the impact of N*(1895) on hyperon production cross sections, providing new insights for experimental analysis.

Findings

N*(1895) significantly influences hyperon photoproduction cross sections.

Proposed existence of an isovector state Sigma(1400) near 1405 MeV.

Branching ratios of N*(1895) decays to Lambda(1405) and Sigma(1400) are 6-7 MeV.

Abstract

In this work, we outline the findings of our recent study of the properties of $N^*(1895)$ and its consequential impacts on the cross sections of the photoproduction of $\Lambda(1405)$. Further, we discuss the possibility of the existence of an isovector state, with the mass similar to $\Lambda(1405)$, which we refer to as $\Sigma(1400)$. With the idea of motivating experimental investigations of $\Sigma(1400)$, we have studied its photoproduction process and determined the respective cross sections and polarization observables. We have studied also the coupling of $N^*(1895)$ to $K\Sigma(1400)$ and found that it gives an important contribution to the cross sections near the threshold. In the process, we have determined the branching ratios of the decay of $N^*(1895)$, to the final states involving $\Lambda(1405)$ and $\Sigma(1400)$, to be in the range of 6-7 MeV. Our findings can motivate consideration of alternative processes in partial wave analyses of experimental data, when studying the properties of $N^*(1895)$.