Evidence for Two Excited \(\Omega^{-}\) Hyperons

Using \(e^+e^-\) collision data corresponding to an integrated luminosity of 19 fb\(^{-1}\) collected by the BESIII detector at center-of-mass energies ranging from 4.13 to 4.70 GeV, we report the first evidence for a new excited \(\Omega^{-}\) hyperon, the \(\Omega^*(2109)^{-}\), through the process \(e^+ e^- \to \Omega^*(2109)^{-} \bar{\Omega}^{+} +c.c.\) with a significance of 3.7 \(\sigma\). The mass and width of \(\Omega^*(2109)^{-}\) are measured to be \(2108.8 \pm 5.5_{\rm stat} \pm 1.5_{\rm syst} {\rm MeV}/c^{2}\) and \(21.6 \pm 17.7_{\rm stat} \pm 9.4_{\rm syst} {\rm MeV}\), respectively. We also present evidence for production of the \(\Omega^*(2012)^{-}\) in the process \(e^+ e^- \to \Omega^*(2012)^{-} \bar{\Omega}^{+} +c.c.\) with a significance of 3.7 \(\sigma\).