Understanding the enhanced $\varphi {\eta }^{\prime }$ decay mode of the $\varphi (2170)$ through strange-meson loops

Qin-Song Zhou, Jun-Zhang Wang, Dan Guo

The nature of the strangeonium-like $\varphi (2170)$ remains controversial. Recent measurements of $e^{+}{e}^{-}\to \varphi {\eta }^{(\prime )}$ reveal a striking puzzle: a broad $\varphi (2170)$-like structure appe…