Study of $\psi (3686)\to \mathrm{\Lambda }\bar{\mathrm{\Lambda }}\omega$

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 $\psi (3686)\to \mathrm{\Lambda }\bar{\mathrm{\Lambda }}\omega$ is measured to be $(3.30\pm 0.34(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{.})\pm 0.29(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t}\mathrm{.}))\times {10}^{-5}$ for the first time. In addition, the $\mathrm{\Lambda }\omega$ (or $\bar{\mathrm{\Lambda }}\omega$) invariant mass spectra is studied and the potential presence of excited $\mathrm{\Lambda }$ states has been investigated.