Measurement of Born Cross Sections for $e^{+}{e}^{-}\to \hat{I}{\pounds }^{-}\bar{\hat{I}}{\pounds }^{+}$ at $\sqrt{s}=3.51-4.95$ GeV and Observation of $\ddot{I}ˆ(3770)\to \hat{I}{\pounds }^{-}\bar{\hat{I}}{\pounds }^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +704

Using $e^{+}{e}^{-}$ collision data corresponding to an integrated luminosity of 44 fb${}^{-1}$ collected with the BESIII detector at the BEPCII collider, we report the first measurement o…