Ablikim, M.Achasov, M.N.Adlarson, P.Afedulidis, O.Ai, X.C.Aliberti, R.Çetin, Serkant Ali2024-05-192024-05-1920242470-0010https://doi.org/10.1103/PhysRevD.109.072015https://hdl.handle.net/20.500.12713/4523Using (2.712±0.014)×109 ?(3686) events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of ?(3686)?3? decay with a significance larger than 10?. The branching fraction of this decay is determined to be (1.46±0.05±0.17)×10-5, where the first uncertainty is statistical and the second is systematic. No significant structure is observed in the ?? invariant mass spectra. © 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/openAccessArticle10972-s2.0-8519177573410.1103/PhysRevD.109.072015Q1