Observation of the $\varphi (1680)$ and the Y(2175) in $e^{+}{e}^{-}\to \varphi {\pi }^{+}{\pi }^{-}$

The Belle Collaboration, C. P. Shen

The cross sections for $e^{+}{e}^{-}\to \varphi {\pi }^{+}{\pi }^{-}$ and $e^+ e^- \to ϕ\fzero$ are measured from threshold to $\sqrt{s}=3.0$ $GeV$ using initial state radiation. The analysis is bas…