2024/07/03 by BESIII Collaboration, M. Ablikim, Ablikim, M. +739
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 · pdf · doi:10.48550/arxiv.2407.02899
openalex publication_date 2024/07/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
A high precision measurement of the branching fraction of the decay J/ψ→ p p η is performed using (10 087 ± 44) × 106 J/ψ events recorded by the BESIII detector at the BEPCII storage ring. The branching fractions of the two decays J/ψ→ p p η(η→ γγ) and J/ψ→ p p η(η→ π+ π- π0) are measured individually to be B(J/ψ→ p p η(η→ γγ)) = (1.480 ± 0.001 ± 0.024)× 10-3 and B(J/ψ→ p p η(η→ π+ π- π0)) = (1.557 ± 0.003 ± 0.038)× 10-3, where the first uncertainties are statistical and the second systematic. Both results are compatible within their uncorrelated systematic uncertainties. The combined result is B(J/ψ→ p p η)=(1.495 ± 0.001 ± 0.023)× 10-3 where the first uncertainty is the combined statistical uncertainty and the second one the combined systematic uncertainty of both analyses, incorporating correlations between them. In addition, the p p threshold region is investigated for a potential threshold enhancement, and no evidence for one is observed.