Model-Independent Determination of the Spin of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Ω</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> and Its Polarization Alignment in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3686</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi mathvariant="…

We present an analysis of the process ψ(3686)→Ω−Ω¯+ (Ω−→K−Λ, Ω¯+→K+Λ¯, Λ→pπ−, Λ¯→p¯π+) based on a dataset 448×106 ψ(3686) decays collected with BESIII detector at BEPCII electron-positron collider. The helicity amplitudes for and decay parameters subsequent Ω−→K−Λ (Ω¯+→K+Λ¯) are measured first time by fit to angular distribution complete chain, spin Ω− is determined be 3/2 since its discovery more than 50 years ago.Received 6 July 2020Revised 19 October 2020Accepted 27 January 2021DOI:https://doi.org/10.1103/PhysRevLett.126.092002Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.Published SocietyPhysics Subject Headings (PhySH)Research AreasForm factorsParticle decaysParticle interactionsParticle productionParticles & Fields