Observation of ψ (3686) → Ξ − K S 0 Ω ¯ + + c.c

Journal article

Using a sample of (2.712 ± 0.014) × 109ψ(3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay ψ(3686) → Ξ−KS0Ω¯+ + c.c. is observed for the first time, which has a significance of 5.9 standard deviations. The branching fraction of this decay is measured to be (2.91 ± 0.47 ± 0.33) × 10−6, where the first and second uncertainties are statistical and systematic, respectively. The ratio between Bψ3686→Ξ−KS0Ω¯++c.c and Bψ3686→Ω−K+Ξ¯0+c.c is determined to be 1.05 ± 0.23 ± 0.14, which deviates from the isospin symmetry conservation predicted value of 0.5 by 2.1σ.

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: 6
• Article number: 233
• Publication date: 2025-06-25
• Acceptance date: 2025-05-27
• DOI: 10.1007/jhep06(2025)233
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Branching fraction; e+-e− Experiments; Quarkonium