Using $(2712.4\pm14.3)\times10^6$ $\psi(3686)$ events collected by the BESIII detector operating at the BEPCII storage ring, the decays $\chi_{ cJ}(J=0,1,2)\rightarrow p\bar{ p}\eta\eta$ are observed for the first time through the radiative transition $\psi(3686)\to\gamma\chi_{ cJ}$. The statistical significances for $\chi_{ cJ}$ signals are all larger than 5$\sigma$. The branching fractions of $\chi_{ c0,1,2}\to p\bar{ p} \eta\eta$ are determined to be $({ 5.75 \pm 0.59 \pm 0.42}) \times 10^{ -5}$, $({ 1.40 \pm 0.33 \pm 0.17}) \times 10^{ -5}$, and $({ 2.64 \pm 0.40 \pm 0.27}) \times 10^{ -5}$, respectively, where the first uncertainties are statistical and the second systematic. No evident resonant structures are found in the $p\bar{ p}$ and $p\eta/\bar{ p}\eta$ systems.
Categories: hep-ex