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

Abstract

Based on $e^{+}{e}^{-}$ annihilation data collected with the BESIII detector at the BEPCII collider, searches for the $e^{+}{e}^{-}\to {\Sigma }_c{\bar{\Sigma }}_c$ (${\Sigma }_c^{+}{\bar{\Sigma }}_c^{-}$, ${\Sigma }_c^0{\bar{\Sigma }}_c^0$ and ${\Sigma }_c^{++}{\bar{\Sigma }}_c^{--}$) processes, as well as for the isospin-violating process $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Sigma }}_c^{-}$, 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$\%$ confidence level are reported.

10 pages, 5 figures