Ablikim, M.Achasov, M. N.Adlarson, P.Ahmed, S.Albrecht, M.Amoroso, A.Çetin, Serkant Ali2024-07-182024-07-1820210031-90071079-7114https://doi.org/10.1103/PhysRevLett.126.092002https://hdl.handle.net/11411/7710We present an analysis of the process psi(3686) -> Omega(-)(Omega) over bar (+)(Omega(-). K-Lambda, (Omega) over bar (+) K+ (Lambda) over bar,(Omega) over bar (+) Lambda -> p pi(-), (Lambda) over bar -> p (p) over bar pthorn) based on a dataset of 448 x 10(6) psi(o3686) decays collected with the BESIII detector at the BEPCII electron-positron collider. The helicity amplitudes for the process psi(368)-> O-O thorn and the decay parameters of the subsequent decay O-. K-. oO thorn. Kthorn. THORN are measured for the first time by a fit to the angular distribution of the complete decay chain, and the spin of the O- is determined to be 3=2 for the first time since its discovery more than 50 years ago.eninfo:eu-repo/semantics/openAccessViolationBaryonsDecaysArticle2-s2.0-8510217534510.1103/PhysRevLett.126.092002933750166Q1126Q1WOS:000627618200009