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We present an analysis of the process $\psi(3686) \to \Omega^-\bar{\Omega}^+$ ($\Omega^-\to K^-\Lambda$, $\bar{\Omega}^+\toK^+\bar{\Lambda}$, $\Lambda\to p\pi^-$, $\bar{\Lambda}\to \bar{p}\pi^+$) basedon a data set of $448\times 10^6$ $\psi(3686)$ decays collected with the BESIIIdetector at the BEPCII electron-positron collider. The helicity amplitudes forthe process $\psi(3686) \to \Omega^- \bar{\Omega}^+$ and the decay parametersof the subsequent decay $\Omega^-\to K^-\Lambda$ $(\bar{\Omega}^+\toK^+\bar{\Lambda})$ are measured for the first time by a fit to the angulardistribution of the complete decay chain. The branching fraction of $\psi(3686)\to \Omega^- \bar{\Omega}^+$ is measured to be $(5.82\pm 0.12\pm 0.24)\times10^{-5}$, with an improved precision compared to previous measurements.

Model independent determination of the spin of the $\Omega^{-}$ and its polarization alignment in $\psi(3686)\rightarrow\Omega^{-}\bar{\Omega}^{+}$