Based on a data sample of $(448.1\pm 2.9)\times {10}^6\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fraction of $\psi (3686)\to \mathrm{\Lambda }\overline{\mathrm{\Lambda }}\omega$ is measured to be $(3.30\pm 0.34(\mathrm{stat})\pm 0.29(\mathrm{syst}))\times {10}^{-5}$ for the first time. In addition, the $\mathrm{\Lambda }\omega$ (or $\overline{\mathrm{\Lambda }}\omega$) invariant mass spectra is studied and the potential presence of excited $\mathrm{\Lambda }$ states has been investigated.

• Received 26 July 2022
• Accepted 2 December 2022

DOI:https://doi.org/10.1103/PhysRevD.106.112011

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Published by the American Physical Society