Study of resonant structure around 1.8 GeV/$c^2$ and $\eta(1405)$ in $J/\psi\rightarrow\omega\eta\pi^+\pi^-$

TL;DR

This study analyzes $J/psi$ decays into $omegaetapipi$ using a large data sample, revealing a new process involving $X(1870)$ and confirming known resonances with high significance.

Contribution

First observation of the decay $J/psi ightarrow omega X(1870)$ with $X(1870)$ decaying to $a_0(980)pi$, expanding understanding of $J/psi$ decay channels.

Findings

Observation of $J/psi ightarrow omega X(1870)$ with >7.2$$ significance

Detection of $J/psi ightarrow omega f_1(1285)$ with >10$$ significance

Observation of $J/psi ightarrow omega eta(1405)$ with >10$$ significance

Abstract

We present results of a study of the decay $J/\psi\rightarrow\omega\eta\pi^+\pi^-$ using a sample of $(225.2\pm2.8)\times10^6$ $J/\psi$ events collected by the BESIII detector, and report the observation of a new process of $J/\psi\rightarrow \omega X(1870)$ in which X(1870) decays to $a_0(980)\pi$. The statistical significance of this process is larger than $7.2\sigma$. Signals for $J/\psi\rightarrow \omega f_1(1285)$ and $J/\psi\rightarrow \omega\eta(1405)$ are also observed in $\eta\pi^+\pi^-$ spectrum, with statistical significances much larger than $10\sigma$.