Using data samples with an integrated luminosity of 6.4 fb−1 collected by the BESIII detector operating at the BEPCII storage ring, the process of e+e− → γφJ/ψ is studied. The processes of e+e− → φχc1,c2, χc1,c2 → γJ/ψ are observed with a significance of more than 10σ. The √s-dependent cross section of e+e− → φχc1,c2 is measured between 4.600 and 4.951 GeV, and evidence of a resonance structure is found for the first time in the φχc2 process. We also search for the processes of e+e− → γX(4140), γX(4274) and γX(4500) via the γφJ/ψ final state, but no obvious structures are found. The upper limits on the production cross section times the branching fraction for these processes at the 90% confidence level are reported.
Study of e + e − → γϕJ/ψ from √s = 4.600 to 4.951 GeV
Balossino, I.;Bettoni, D.;Cibinetto, G.;Garzia, I.;Scodeggio, M.;
2023
Abstract
Using data samples with an integrated luminosity of 6.4 fb−1 collected by the BESIII detector operating at the BEPCII storage ring, the process of e+e− → γφJ/ψ is studied. The processes of e+e− → φχc1,c2, χc1,c2 → γJ/ψ are observed with a significance of more than 10σ. The √s-dependent cross section of e+e− → φχc1,c2 is measured between 4.600 and 4.951 GeV, and evidence of a resonance structure is found for the first time in the φχc2 process. We also search for the processes of e+e− → γX(4140), γX(4274) and γX(4500) via the γφJ/ψ final state, but no obvious structures are found. The upper limits on the production cross section times the branching fraction for these processes at the 90% confidence level are reported.File | Dimensione | Formato | |
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