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• W4377010280 abstract "Cross sections for the process $e^{+} e^{-} to K_{S}^{0} K_{S}^{0} J/psi$ 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 $e^{+} e^{-} to K_{S}^{0} K_{S}^{0} J/psi$ cross section for the first time with a statistical significance of 26.0$sigma$. In addition, an enhancement around $4.710$ GeV, called the $Y(4710)$, is seen with a statistical significance of 4.2$sigma$. 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 $Y(4230)$ state to be $4226.9 pm 6.6 pm 21.9$ MeV/$c^{2}$ and $71.7 pm 16.2 pm 31.4$ MeV, respectively, and the mass and width of the $Y(4710)$ state to be $4704.0 pm 52.3 pm 69.5$ MeV/$c^{2}$ and $183.2 pm 114.0 pm 90.8$ MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio of $e^{+} e^{-} to K_{S}^{0} K_{S}^{0} J/psi$ to $e^{+} e^{-} to K^{+} K^{-} J/psi$ is measured to be $0.388_{-0.028}^{+0.035}pm0.016$, or $0.426_{-0.031}^{+0.038}pm0.018$ if three-body phase space is considered." @default.
• W4377010280 created "2023-05-19" @default.
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