2025/12/23 by BESIII Collaboration, M. Ablikim, Ablikim, M. +794
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.2512.19993
openalex publication_date 2025/12/23 · openalex created_date 2025/12/25 · openalex updated_date 2026/07/28
Based on (2.712±0.014)×109 ψ(3686) events collected with the BESIII detector, the decays χcJ → p p K0S K0S (J=0,1,2) are observed for the first time with statistical significances exceeding 5σ.The measured branching fractions are B(χc0→ p p K0S K0S)=(6.94±0.30±0.38)×10-5, B(χc1→ p p K0S K0S)=(1.30±0.12±0.08)×10-5, and B(χc2→ p p K0S K0S)=(2.54±0.17±0.15)×10-5, where the first uncertainties are statistical and the second systematic. In addition, no significant structures are observed in the p p, p K0S, and p K0S mass spectra.