Observation of $χ_{cJ}\to ΛK^0_S\bar Ξ^0 + c.c.$ and improved measurements of $χ_{cJ}\to ΛK^-\bar Ξ^+ + c.c.$

Abstract

By analyzing $(2712.4\pm14.3)\times10^6$ $ψ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, we report the first observation of $χ_{cJ}\to ΛK^0_S\bar Ξ^0 + c.c.$ ($J=0,1,2$) with significances greater than $10σ$, including systematic uncertainties, and improved measurements of $χ_{cJ}\to ΛK^-\bar Ξ^+ + c.c.$ The branching fractions of these decays are determined to be $\mathcal{B}(χ_{c0}\to ΛK^0_S\bar Ξ^0+c.c.)=(1.13\pm0.13\pm0.13)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to ΛK^0_S\bar Ξ^0+c.c.)=(0.74\pm0.08\pm0.07)\times10^{-4}$, $\mathcal{B}(χ_{c2}\to ΛK^0_S\bar Ξ^0+c.c.)=(1.16\pm0.11\pm0.14)\times10^{-4}$, $\mathcal{B}(χ_{c0}\to ΛK^-\bar Ξ^++c.c.)=(1.90\pm0.08\pm0.16)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to ΛK^-\bar Ξ^++c.c.)=(1.40\pm0.05\pm0.11)\times10^{-4}$, and $\mathcal{B}(χ_{c2}\to ΛK^-\bar Ξ^++c.c.)=(1.95\pm0.07\pm0.15)\times10^{-4}$. The first uncertainties are statistical, and the second are systematic.