Observation of an axial-vector state in the study of $\psi (3686)\to \varphi \eta {\eta }^{\prime }$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +635

Using (2712.4 $\pm$ 14.3)$\times 10^6$ $\psi (3686)$ events collected with the BESIII detector at BEPCII, a partial wave analysis of the decay $\psi (3686)\to \varphi \eta {\eta }^{\prime }$ is performed with t…