Cross sections for the process e+e− → K0SK0SJ/ψ at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fb−1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+e− → K0SK0SJ/ψ cross section for the first time with a statistical significance of 26.0σ. In addition, an enhancement around 4.710 GeV, labeled as the Y(4710), is seen with a statistical significance of 4.2σ. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Yð4230Þ state to be 4226.9 pm 6 pm 22.0 MeV/c2 and 71.7 pm 16.2 pm 32.8 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0pm52.3 pm69.5 MeV/c2 and 183.2 pm 114.0 pm 96.1 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio is measured to be 0.388þ0.035 0.016, or 0.426þ0.038 0.018 if three-body phase space is considered.
Observation of the Y(4230) and evidence for a new vector charmoniumlike state Y(4710) in e+e− →K0SK0SJ/ψ
Garzia I.;Scodeggio M.;
2023
Abstract
Cross sections for the process e+e− → K0SK0SJ/ψ at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fb−1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+e− → K0SK0SJ/ψ cross section for the first time with a statistical significance of 26.0σ. In addition, an enhancement around 4.710 GeV, labeled as the Y(4710), is seen with a statistical significance of 4.2σ. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Yð4230Þ state to be 4226.9 pm 6 pm 22.0 MeV/c2 and 71.7 pm 16.2 pm 32.8 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0pm52.3 pm69.5 MeV/c2 and 183.2 pm 114.0 pm 96.1 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio is measured to be 0.388þ0.035 0.016, or 0.426þ0.038 0.018 if three-body phase space is considered.File | Dimensione | Formato | |
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PhysRevD.107.092005.pdf
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