Ablikim, M.Achasov, M.N.Adlarson, P.Ai, X.C.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920240031-9007https://doi.org/10.1103/PhysRevLett.132.161901https://hdl.handle.net/20.500.12713/4533We present measurements of the Born cross sections for the processes e+e-???c1 and ??c2 at center-of-mass energies s from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of 11.0 fb-1 collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring. Assuming the e+e-???c2 signals come from a single resonance, the mass and width are determined to be M=(4413.6±9.0±0.8) MeV/c2 and ?=(110.5±15.0±2.9) MeV, respectively, which is consistent with the parameters of the well-established resonance ?(4415). In addition, we also use one single resonance to describe the e+e-???c1 line shape and determine the mass and width to be M=(4544.2±18.7±1.7) MeV/c2 and ?=(116.1±33.5±1.7) MeV, respectively. The structure of this line shape, observed for the first time, requires further understanding. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.eninfo:eu-repo/semantics/openAccessStorage RingsBeijing Electron Positron ColliderCenter-Of-Mass EnergiesCentre-Of-Mass EnergiesData SampleIntegrated LuminosityLines ShapesMeasurements OfSingle ResonanceDigital StorageArticleControlled StudyDiagnosisLuminanceArticle13216387014812-s2.0-8519166315010.1103/PhysRevLett.132.161901N/A