Observation of the decay $\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0\omega$

Abstract

Using a dataset of $(27.12\pm 0.14)\times 10^8$ $\psi (3686)$ events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of the decay $\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0\omega$ with a statistical significance of 8.9$\sigma$. The measured branching fraction is $(1.24\pm 0.16_{\text{stat}}\pm 0.11_{\text{sys}})\times 10^{-5}$, where the first uncertainty is statistical and the second is systematic. Additionally, we investigate potential intermediate states in the invariant mass distributions of ${\Sigma }^0\omega$, ${\bar{\Sigma }}^0\omega$ and ${\Sigma }^0{\bar{\Sigma }}^0$. A hint of a resonance is observed in the invariant mass distribution of $M_{{\Sigma }^0({\bar{\Sigma }}^0)\omega }$, located around 2.06 GeV/$c^2$, with a significance of 2.5$\sigma$.

References in corpus (10)

• Heavy quarkonium: progress, puzzles, and opportunities
• Gauge Invariant Lagrangians for Free and Interacting Higher Spin Fields. A Review of the BRST formulation
• Method for detector description transformation to Unity and application in BESIII
• Determination of the number of $\psi (3686)$ events taken at BESIII
• Observation of a near-threshold enhancement in the $\Lambda \bar{\Lambda }$ mass spectrum from $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ at $\sqrt{s}$ from 3.51 to 4.60 GeV
• Strong and weak $CP$ tests in sequential decays of polarized ${\Sigma }^0$ hyperons
• Measurement of $\psi (3686)\to \Lambda \bar{\Lambda }\eta$ and $\psi (3686)\to \Lambda \bar{\Lambda }{\pi }^0$ decays
• Precise measurement of the branching fractions of $J/\psi \to \bar{\Lambda }{\pi }^{+}{\Sigma }^{-}+c.c.$ and $J/\psi \to \bar{\Lambda }{\pi }^{-}{\Sigma }^{+}+c.c.$
• Improved measurement of the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+(0)}{\pi }^{-(0)}$ and search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$
• Observation of the $\psi (3686)$ decays into ${\Sigma }^{+}{\bar{\Sigma }}^{-}\omega$ and ${\Sigma }^{+}{\bar{\Sigma }}^{-}\varphi$