Evidence of doubly OZI-suppressed decay $ {\eta }_{c}\to \omega \varphi $ in the radiative decay $ J/\psi \to \gamma {\eta }_{c}$

Using a sample of $ (10087\pm 44)\times {10}^{6}\text{}\text{}J/\psi $ events collected with the BESIII detector at the BEPCII collider, the first evidence for the doubly Okubo-Zweig-Iizuka (OZI)-suppressed decay $ {\eta }_{c}\to \omega \varphi $ is reported with a significance of $ 4.0\sigma $. The branching fraction of $ {\eta }_{c}\to \omega \varphi $ is measured to be $ \mathcal{B}({\eta }_{c}\to \omega \varphi )=\phantom{\rule{0ex}{0ex}}(3.86\pm 0.92\pm 0.62)\times {10}^{-5}$, where the first uncertainty is statistical and the second is systematic. This result provides valuable insights into the underlying mechanisms of charmonium decays, particularly for processes such as $ {\eta }_{c}\to VV$ (where $ V$ represents a vector meson).