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$\sigma$.

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