Hyperon Pair Production at BESIII

Abstract

This poster presents recent experimental findings from the BESIII experiment, including two categories of studies. Firstly, it reports the studies on the hyperon pair production in the processes $e^{+}{e}^{-}\to \hat{I}›\bar{\hat{I}}›$, $\hat{I}{\pounds }^{+}\bar{\hat{I}}{\pounds }^{-}$, $\hat{I}{\pounds }^0\bar{\hat{I}}{\pounds }^0$, $\hat{I}{ž}^0\bar{\hat{I}}{ž}^0$ and $\hat{I}{ž}^{-}\bar{\hat{I}}{ž}^{+}$. The Born cross sections for these processes are measured at center-of-mass energies ranging from $3.5$ to $4.9$ GeV. For the first time, evidence for the decays $\ddot{I}ˆ(3770)\to \hat{I}›\bar{\hat{I}}›$ and $\hat{I}{ž}^{-}\bar{\hat{I}}{ž}^{+}$ is found. Secondly, it reports the measurements of the Born cross sections of multi-body decays involving hyperon final states. The evidence of $\ddot{I}ˆ(4160)\to K^{-}\bar{\hat{I}}{ž}^{+}\hat{I}›+c.c.$ is found. These results offer new perspectives on hyperon production in $e^{+}{e}^{-}$ annihilation and the decay mechanism of vector charmonium(-like) states, contributing to our understanding of hadron dynamics.

6 pages, 3 figures, contribution to The 21st International Conference on Hadron Spectroscopy and Structure (HADRON2025)