Ablikim, M.Achasov, M. N.Adlarson, P.Ahmed, S.Albrecht, M.Aliberti, R.Çetin, Serkant Ali2024-07-182024-07-1820211029-8479https://doi.org/10.1007/JHEP10(2021)177https://hdl.handle.net/11411/7079Using 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(-)-> eta psi(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.eninfo:eu-repo/semantics/openAccessE(+)-E(-) ExperimentsExoticsParticle And Resonance ProductionQuarkoniumArticle2-s2.0-8511815624410.1007/JHEP10(2021)17710Q2Q1WOS:000710240200004