We present an analysis of the process ψ(3686)→Ω−¯Ω+ (Ω−→K−Λ, ¯Ω+→K+¯Λ, Λ→pπ−, ¯Λ→¯pπ+) based on a dataset of 448×106  ψ(3686) decays collected with the BESIII detector at the BEPCII electron-positron collider. The helicity amplitudes for the process ψ(3686)→Ω−¯Ω+ and the decay parameters of the subsequent decay Ω−→K−Λ (¯Ω+→K+¯Λ) are measured for the first time by a fit to the angular distribution of the complete decay chain, and the spin of the Ω− is determined to be 3/2 for the first time since its discovery more than 50 years ago.

Model-Independent Determination of the Spin of the Omega(-) and Its Polarization Alignment in psi(3686) -> Omega(-)(Omega)over-bar(+)

Amoroso A.;Bianchi F.;Bortone A.;Destefanis M.;De Mori F.;Greco M.;Lavezzi L.;Maggiora M.;Marcello S.;Sosio S.;Spataro S.;
2021-01-01

Abstract

We present an analysis of the process ψ(3686)→Ω−¯Ω+ (Ω−→K−Λ, ¯Ω+→K+¯Λ, Λ→pπ−, ¯Λ→¯pπ+) based on a dataset of 448×106  ψ(3686) decays collected with the BESIII detector at the BEPCII electron-positron collider. The helicity amplitudes for the process ψ(3686)→Ω−¯Ω+ and the decay parameters of the subsequent decay Ω−→K−Λ (¯Ω+→K+¯Λ) are measured for the first time by a fit to the angular distribution of the complete decay chain, and the spin of the Ω− is determined to be 3/2 for the first time since its discovery more than 50 years ago.
2021
126
9
092002-1
092002-8
DOI:10.1103/PhysRevLett.126.092002
Baryon Spectroscopy, Helicity amplitudes, electron-positron collisions
Ablikim M.; Achasov M.N.; Adlarson P.; Ahmed S.; Albrecht M.; Amoroso A.; An Q.; Anita; Bai Y.; Bakina O.; Baldini Ferroli R.; Balossino I.; Ban Y.; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1812107
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