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Physical review（2023）
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Abstract
The J/ψ→Ξ0Ξ¯0 process and subsequent decays are investigated using (10087±44)×106 J/ψ events collected at the BESIII experiment. The decay parameters of Ξ0 and Ξ¯0 are simultaneously measured to be αΞ=−0.3750±0.0034±0.0016, α¯Ξ=0.3790±0.0034±0.0021, ϕΞ=0.0051±0.0096±0.0018 rad, ϕ¯Ξ=−0.0053±0.0097±0.0019 rad with unprecedented accuracies, where the first and the second uncertainties are statistical and systematic, respectively. The most precise values for CP asymmetry observables of Ξ0 decay are obtained to be ACPΞ=(−5.4±6.5±3.1)×10−3 and ΔϕCPΞ=(−0.1±6.9±0.9)×10−3 rad. For the first time, the weak and strong phase differences are determined to be ξP−ξS=(0.0±1.7±0.2)×10−2 rad and δP−δS=(−1.3±1.7±0.4)×10−2 rad, which are the most precise results for any weakly decaying baryon. These results will play important roles in the studies of the CP violations and polarizations for the strange, charmed, and beauty baryons.Received 16 May 2023Revised 4 June 2023Accepted 20 July 2023DOI:https://doi.org/10.1103/PhysRevD.108.L031106Published by the American Physical Society under the terms of the 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.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHadronic decaysPhysical SystemsHyperonsPropertiesCP violationPolarizationParticles & Fields
