Using $e^{+}{e}^{-}$ annihilation data taken with the CLEO-c detector, measurements of two major ${\mathrm{\Omega }}^{-}$ branching fractions have been made using the reaction $\psi (2S)\to {\mathrm{\Omega }}^{-}{\overline{\mathrm{\Omega }}}^{+}$. The ${\mathrm{\Omega }}^{-}$ decay channels are identified through momentum distributions of charged particles, and systematics of the ${\mathrm{\Omega }}^{-}$ branching fractions have been studied. The results are $\mathcal{B}({\mathrm{\Omega }}^{-}\to {\mathrm{\Lambda }}^0{K}^{-})=(68.9\pm 9.5\pm 4.3)\%$ and $\mathcal{B}({\mathrm{\Omega }}^{-}\to {\mathrm{\Xi }}^0{\pi }^{-})=(19.0\pm 4.0\pm 1.2)\%$.

• Received 22 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.012007

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Published by the American Physical Society