Data taking strategy for $\psi (3770)$ and ${\rm Y}(4S)$ branching fraction measurements at $e^{+}{e}^{-}$ colliders

Jiaxin Li, Xiantao Hou, Junli Ma +2

The $\psi (3770)$ and ${\rm Y}(4S)$ states predominantly decay into open-flavor meson pairs, whereas the decays of $ψ(3770) \to \mbox{\text{non}-}D\bar{D}$ and $Υ(4S) \to \mbox{\text{non}-}B…