First measurement of $\hat{I}{\pounds }^{+}n\to \hat{I}›p$ and $\hat{I}{\pounds }^{+}n\to \hat{I}{\pounds }^{0}p$ cross sections via $\hat{I}{\pounds }^{+}$-nucleus scattering at an electron-positron collider

BESIII Collaboration, M. Ablikim, M. N. Achasov +678

Using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ events collected with the BESIII detector at the BEPCII storage ring, the reactions $\hat{I}{\pounds }^{+}n\to \hat{I}›p$ and $Σ^{+}n\rightarrowΣ^…