Abstract
Using a total of 5.25 fb−1 of e+e− collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process e+e− → ηψ(2S) with a statistical significance of 4.9 standard deviations. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.
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The BESIII collaboration., Ablikim, M., Achasov, M.N. et al. Observation of e+e− → ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV. J. High Energ. Phys. 2021, 177 (2021). https://doi.org/10.1007/JHEP10(2021)177
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DOI: https://doi.org/10.1007/JHEP10(2021)177