Study of resonant structure around 1.8 GeV/$c^2$ and $η(1405)$ in $J/ψ\rightarrowωηπ^+π^-$

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 $10\sigma$.