# Measurement of the branching fraction of $J/\psi \rightarrow \omega \eta' \pi^{+}\pi^{-}$ and search for $J/\psi \rightarrow \omega X(1835), \, X(1835) \rightarrow \eta' \pi^{+}\pi^{-}$ decay

## TL;DR

This study measures the branching fraction of a specific J/psi decay and searches for the X(1835) state, setting an upper limit on its production, using a large dataset from BESIII.

## Contribution

First measurement of the branching ratio for J/psi to omega eta' pi+ pi- and the first search for X(1835) in this decay channel.

## Key findings

- Branching ratio B(J/psi → ω η' π+ π−) = (1.12 ± 0.02 ± 0.13) × 10^{-3}
- No evidence for X(1835) in the decay channel
- Upper limit on X(1835) production set at 6.2 × 10^{-5}

## Abstract

Using a sample of $1.31 \times 10^{9}$ $J/\psi$ events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the $J/\psi \rightarrow \omega \eta' \pi^{+}\pi^{-}$ hadronic process. For the first time, we measure the branching ratio $B(J/\psi \rightarrow \omega \eta' \pi^{+}\pi^{-}) = (1.12 \pm 0.02 \pm 0.13) \times 10^{-3}$. We search for the $X(1835)$ state in the $\eta' \pi^{+}\pi^{-}$ invariant mass spectra. No evidence is found and we estimate the upper limit on the branching fraction at 90% confidence level to be $B(J/\psi \rightarrow \omega X(1835), \, X(1835) \rightarrow \eta' \pi^{+}\pi^{-}) < 6.2 \times 10^{-5}$.