TY - JOUR
T1 - Tests of CP symmetry in entangled Ξ0- Ξ ¯ 0 pairs
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Ai, X. C.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2023 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 SCOAP
PY - 2023/8/1
Y1 - 2023/8/1
N2 - 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 ζP-ζS=(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.
AB - 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 ζP-ζS=(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.
UR - https://www.scopus.com/pages/publications/85172884065
U2 - 10.1103/PhysRevD.108.L031106
DO - 10.1103/PhysRevD.108.L031106
M3 - Article
AN - SCOPUS:85172884065
SN - 2470-0010
VL - 108
JO - Physical Review D
JF - Physical Review D
IS - 3
M1 - L031106
ER -