Measurements of the cross sections of $e^{+}{e}^{-}\to {\mathrm{\Sigma }}_c{\bar{\mathrm{\Sigma }}}_c$ and ${\mathrm{\Lambda }}_c^{+}{\bar{\mathrm{\Sigma }}}_c^{-}$ near kinematic thresholds

Based on $e^{+}{e}^{-}$ annihilation data collected with the BESIII detector at the BEPCII collider, searches for the $e^{+}{e}^{-}\to {\mathrm{\Sigma }}_c{\bar{\mathrm{\Sigma }}}_c$ (${\mathrm{\Sigma }}_c^{+}{\bar{\mathrm{\Sigma }}}_c^{-}$, ${\mathrm{\Sigma }}_c^0{\bar{\mathrm{\Sigma }}}_c^0$ and ${\mathrm{\Sigma }}_c^{++}{\bar{\mathrm{\Sigma }}}_c^{--}$) processes, as well as for the isospin-violating process $e^{+}{e}^{-}\to {\mathrm{\Lambda }}_c^{+}{\bar{\mathrm{\Sigma }}}_c^{-}$, are conducted for the first time at $\sqrt{s}=4.750$, $4.781$, $4.843$, $4.918$, and $4.951$ GeV. As no signals are observed for all the above channels, the upper limits on their Born cross sections at the 90$\mathrm{\%}$ confidence level are reported.