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Ablikim, M
Physical review. D, 05/2021, Volume: 103, Issue: 9Journal Article
The decays ψ2(3823 ) → γχc0,1,2, π+π− J/ψ, π0π0J/ψ , ηJ/ψ, and π0J/ψ are searched for using the reaction e+e− → π+π− ψ2 (3823) in a 19 fb−1 data sample collected at center-of-mass energies between 4.1 and 4.7 GeV with the BESIII detector. The process ψ2(3823) → γχc1 is observed in a 9 fb−1 data sample in the center-of-mass energy range 4.3–4.7 GeV, which confirms a previous observation but with a higher significance of 11.8 σ , and evidence for ψ2(3823) → γχc2 is found with a significance of 3.2 σ for the first time. The branching-fraction ratio ... is determined. No significant ψ2 (3823) signals are observed for any of the other decay channels. Upper limits of branching-fraction ratios for ψ2(3823 ) → π+π− J/ψ , π0π0 J/ψ, ηJ/ψ , π0 J/ψ, γ χc0 relative to ψ2 (3823) → γχc1 are reported. The process e+e− → π0π0ψ2 (3823) is also searched for, and we find evidence for the process with a significance of 4.3 σ . The average cross-section ratio σ (e+e− → π0π0ψ2 (3823)) σ (e+e− → π+π− ψ2 (3823)) is also determined. (ProQuest: ... denotes formula omited.).
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