Observation of $ {\chi}_{cJ}\left(J=0,1,2\right)\to p\overline{p}\eta \eta $

Using (2712.4 ± 14.3) × 106 ψ(3686) candidates collected by the BESIII detector operating at the BEPCII storage ring, the decays ${\chi}_{cJ}\left(J=0,1,2\right)\to p\overline{p}\eta \eta$ are observed for the first time through the radiative transition ψ(3686) → γχ cJ . The statistical significances for χ cJ signals are all larger than 5σ. The branching fractions of ${\chi}_{c0,1,2}\to p\overline{p}\eta \eta$ are determined to be (5.75 ± 0.59 ± 0.42) × 10 −5, (1.40 ± 0.33 ± 0.17) × 10 −5, and (2.64 ± 0.40 ± 0.27) × 10 −5, respectively, where the first uncertainties are statistical and the second systematic. No evident resonant structures are found in the $p\overline{p}$ and $p\eta /\overline{p}\eta$ systems.