Observation of a near-threshold enhancement in the $\Lambda \bar{\Lambda }$ mass spectrum from $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ at $\sqrt{s}$ from 3.51 to 4.60 GeV

M. Ablikim, M. N. Achasov, P. Adlarson +503

The process $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ is studied using data samples collected with the BESIII detector at the BEPCII collider at center-of-mass energies $\sqrt{s}$ ranging from $3.51$…