Observation of χ cJ J = 0 1 2 → p p ¯ ηη

Journal article

Using (2712.4 ± 14.3) × 106ψ(3686) candidates collected by the BESIII detector operating at the BEPCII storage ring, the decays χcJJ=012→pp¯ηη are observed for the first time through the radiative transition ψ(3686) → γχcJ. The statistical significances for χcJ signals are all larger than 5σ. The branching fractions of χc0, 1, 2→pp¯ηη 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 pp¯ and pη/p¯η systems.

Authors: Ablikim, M; Achasov, MN; Adlarson, P; Ai, XC; Aliberti, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2025
• Issue: 10
• Article number: 90
• Publication date: 2025-10-10
• Acceptance date: 2025-08-20
• DOI: 10.1007/jhep10(2025)090
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Quarkonium; e+-e− Experiments; Branching fraction