Observation of a cross-section enhancement near mass threshold in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$

M. Ablikim, M. N. Achasov, S. Ahmed +428

The process $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ is studied using data samples at $\sqrt{s}=2.2324$, 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating at the BEPCII…