Observation of $χ_{cJ} → Λ \overline{Λ} η$
BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson et autres
By analyzing $(448.1\pm2.9)\times10^6$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays of $χ_{cJ} \to Λ\bar Λη$ ($J=0$, 1 and 2) are observed for the first time with statistical significances of $13.9σ$, $6.7σ$, and $8.2σ$, respectively. The …