Ablikim, M.Achasov, M.N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920231029-8479https://doi.org/10.1007/JHEP02(2023)171https://hdl.handle.net/20.500.12713/4365Using a data sample corresponding to an integrated luminosity of 11.3 fb?1 collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we observe the process e+e?? ?0?0?2(3823) for the first time with a statistical significance of 6.0 standard deviations. The ratio of average cross sections for e+e?? ?0?0?2(3823) and ?+???2(3823) is determined to be R=?[e+e???0?0?2(3823)]?[e+e???+???2(3823)]=0.57±0.14±0.05, which is consistent with expectations from isospin symmetry. Here and below, the first uncertainties are statistical and the second are systematic. The mass of the ?2(3823) is measured to be M[?2(3823)] = 3824.5 ± 2.4 ± 1.0 MeV/c2. Due to the limited data sample, an upper limit of 18.8 MeV at 90% confidence level is set on the intrinsic width of ?2(3823). [Figure not available: see fulltext.]. © 2023, The Author(s).eninfo:eu-repo/semantics/openAccessE+-E? ExperimentsExoticsParticle And Resonance ProductionSpectroscopyArticle202322-s2.0-8514851909210.1007/JHEP02(2023)171Q2