Study of the decays χcJ→ΛΛ̄ω

Using (27.12± 0.14)×10⁸ ψ(3686) events collected with the BESIII detector, we present the first observation of the decays χcJ→ΛΛ̄ω, where $J=0, 1, 2$, with statistical significances of 11.7 σ, 11.2 σ, and 11.8 σ. The branching fractions of these decays are determined to be B(χc0→ΛΛ̄ω)=(2.37 ± 0.22 ± 0.23) × 10⁻⁴, B(χc1→ΛΛ̄ω)=(1.01 ± 0.10 ± 0.11) × 10⁻⁴, and B(χc2→ΛΛ̄ω)=(1.40 ± 0.13 ± 0.17) × 10⁻⁴, where the first uncertainties are statistical and the second are systematic. We observe no clear intermediate structures.