Search for $Z_c(3900)^\pm\to\omega\pi^\pm$

TL;DR

This study searches for the decay of the exotic state $Z_c(3900)^ op$ into $7 ext{omega}7 ext{pi}^ op$ using BESIII data but finds no evidence, setting upper limits on the production cross section.

Contribution

First search for the decay $Z_c(3900)^ op o 7 ext{omega}7 ext{pi}^ op$ and establishing upper limits on its production cross section.

Findings

No significant $Z_c(3900)^ op$ signal observed.

Upper limits on cross section are 0.26 pb at 4.23 GeV.

Upper limits on cross section are 0.18 pb at 4.26 GeV.

Abstract

The decay $Z_c(3900)^\pm\to\omega\pi^\pm$ is searched for using data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies $\sqrt{s}=4.23$ and $4.26$~GeV. No significant signal for the $Z_c(3900)^\pm$ is found, and upper limits at the 90\% confidence level on the Born cross section for the process $e^+e^-\to Z_c(3900)^\pm\pi^\mp\to\omega\pi^+\pi^-$ are determined to be $0.26$ and $0.18$ pb at $\sqrt{s}=4.23$ and 4.26 GeV, respectively.