Observation of ${\chi }_{cJ}\to 4K_S^0$

M. Ablikim, M. N. Achasov, S. Ahmed +461

By analyzing $(448.1\pm 2.9)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays of ${\chi }_{cJ}\to 4K_S^0$ ($J=0,1,2$) are obser…