Measurement of CP Asymmetry Parameters and Polarization Correlations in Ω⁻Ω̅⁺ Pairs

@misc{collaboration2026measurement,
  title = {{Measurement of CP Asymmetry Parameters and Polarization Correlations in $Ω^-\barΩ^+$ Pairs}},
  author = {BESIII Collaboration and M. Ablikim and M. N. Achasov and P. Adlarson and X. C. Ai and C. S. Akondi and R. Aliberti and A. Amoroso and L. P. An and Q. An and M. S. Anderson and Y. Bai and O. Bakina and H. R. Bao and X. L. Bao and M. Barbagiovanni and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. B. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and I. Boyko and R. A. Briere and A. Brueggemann and D. Cabiati and H. Cai and M. H. Cai and X. Cai and A. Calcaterra and G. F. Cao and N. Cao and X. Cao and S. A. Cetin and X. Y. Chai and J. F. Chang and T. T. Chang and G. R. Che and Y. Z. Che and C. H. Chen and Chao Chen and G. Chen and H. S. Chen and H. Y. Chen and J. D. Chen and M. L. Chen and S. J. Chen and S. M. Chen and T. Chen and W. Chen and X. R. Chen and X. T. Chen and X. Y. Chen and Y. B. Chen and Y. Q. Chen and Z. K. Chen and J. Cheng},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.05829},
  eprint = {2609.05829},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.05829},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Measurement of CP Asymmetry Parameters and Polarization Correlations in Ω^−Ω̅^+ Pairs
AU  - BESIII Collaboration
AU  - M. Ablikim
AU  - M. N. Achasov
AU  - P. Adlarson
AU  - X. C. Ai
AU  - C. S. Akondi
AU  - R. Aliberti
AU  - A. Amoroso
AU  - L. P. An
AU  - Q. An
AU  - M. S. Anderson
AU  - Y. Bai
AU  - O. Bakina
AU  - H. R. Bao
AU  - X. L. Bao
AU  - M. Barbagiovanni
AU  - V. Batozskaya
AU  - K. Begzsuren
AU  - N. Berger
AU  - M. Berlowski
AU  - M. B. Bertani
AU  - D. Bettoni
AU  - F. Bianchi
AU  - E. Bianco
AU  - A. Bortone
AU  - I. Boyko
AU  - R. A. Briere
AU  - A. Brueggemann
AU  - D. Cabiati
AU  - H. Cai
AU  - M. H. Cai
AU  - X. Cai
AU  - A. Calcaterra
AU  - G. F. Cao
AU  - N. Cao
AU  - X. Cao
AU  - S. A. Cetin
AU  - X. Y. Chai
AU  - J. F. Chang
AU  - T. T. Chang
AU  - G. R. Che
AU  - Y. Z. Che
AU  - C. H. Chen
AU  - Chao Chen
AU  - G. Chen
AU  - H. S. Chen
AU  - H. Y. Chen
AU  - J. D. Chen
AU  - M. L. Chen
AU  - S. J. Chen
AU  - S. M. Chen
AU  - T. Chen
AU  - W. Chen
AU  - X. R. Chen
AU  - X. T. Chen
AU  - X. Y. Chen
AU  - Y. B. Chen
AU  - Y. Q. Chen
AU  - Z. K. Chen
AU  - J. Cheng
PY  - 2026
DA  - 2026/09/05
PB  - arXiv
DO  - 10.48550/arxiv.2609.05829
UR  - https://arxiv.org/abs/2609.05829
AB  - Using (2.71 ± 0.01) × 10^9 ψ(3686) events collected with the BESIII detector, a joint full angular distribution analysis is carried out for the process ψ(3686) → Ω^-(→ΛK^-) Ω̅^+(→ Λ̅K^+). The first simultaneous measurement of the weak decay parameters ϕ_Ω^− and ϕ_Ω̅^+ for Ω^- → K^-Λ and Ω̅^+ → K^+Λ̅ is performed, yielding the first result for the CP-sensitive observable, ϕ_CP = (−0.004 ± 0.055 ± 0.017) rad, where the first and second uncertainties are statistical and systematic, respectively. This further enables the extraction of the weak and strong phase differences between the P- and D-wave amplitudes: (ξ_D − ξ_P) = (−0.15 ± 2.25 ± 0.69) rad and (δ_D − δ_P) = (−0.97 ± 0.88 ± 0.34) rad. Additionally, the polarization correlations between Ω^− and Ω̅^+ are measured.
ER  -