By analyzing $(2712.4\pm14.3)\times10^6$ $\psi(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays $\chi_{ c0,1,2} \to 3K_S^0K^\pm\pi^\mp$ are observed for the first time with statistical significances greater than $10\sigma$. The branching fractions of these decays are determined to be $\mathcal{ B}(\chi_{ c0}\to 3K_S^0K^\pm\pi^\mp )=(7.95\pm0.50\pm0.65)\times10^{ -5},$ $\mathcal{ B}(\chi_{ c1}\to 3K_S^0K^\pm\pi^\mp)=(2.62\pm0.08\pm0.19)\times10^{ -4},$ and $\mathcal{ B}(\chi_{ c2}\to 3K_S^0K^\pm\pi^\mp)=(1.72\pm0.07\pm0.15)\times10^{ -4},$ where the first uncertainties are statistical and the second systematic.
Categories: hep-ex