Exotic decay modes of the nucleon resonance $N^*(1535)$ and the $\theta^+$ problem

TL;DR

This paper explores unconventional decay pathways of the $N^*(1535)$ resonance, suggesting that oscillations between $ ext{eta}$ and $K^0$ mesons, influenced by gluon exchanges, could explain observed strangeness in baryon systems.

Contribution

It introduces a novel interpretation of baryon resonance decay modes involving meson oscillations and gluon exchanges, addressing the $ heta^+$ problem.

Findings

Enhanced $ ext{eta} ightleftarrows K^0$ oscillations due to level proximity.

Decay $N^{*+} o p ext{eta}$ linked to observed strangeness signals.

Gluon exchange mechanisms significantly influence decay pathways.

Abstract

Baryon resonance state with strangeness $S = +1$ observed in systems $p K^0$ and $n K^+$ is interpreted as a result of the decay $N^{*+} \to p \eta$ of the well-known resonance $N^*(1535)$ (with spin-parity $j^P = {1/2}^-$ and mass $m \approx 1.54$ GeV) and the subsequent oscillation $\eta \rightleftarrows K^0$. It is argued that the latter is noticeably enhanced by the neighbourhood of the $\eta$ and $K^0$ levels and the gluon exchanges of the "penguin" form.