Determination of U-spin breaking parameters with an amplitude analysis of the decay D⁰→ K_S,L⁰π⁺π⁻

@misc{collaboration2026determination,
  title = {{Determination of $U$-spin breaking parameters with an amplitude analysis of the decay $D^0\to K_\textS,\textL^0π^+π^-$}},
  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 = oct,
  doi = {10.48550/arxiv.2610.13101},
  eprint = {2610.13101},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.13101},
}

TY  - UNPB
TI  - Determination of U-spin breaking parameters with an amplitude analysis of the decay D^0→ K_S,L^0π^+π^−
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  - 2026/10/09
PB  - arXiv
DO  - 10.48550/arxiv.2610.13101
UR  - https://arxiv.org/abs/2610.13101
AB  - We perform a simultaneous amplitude analysis of the decays D^0 → K_S^0π^+π^− and D^0 → K_L^0π^+π^− using an e^+e^- collision data sample, corresponding to an integrated luminosity of 20.3 fb^−1, collected at the centre-of-mass energy of 3.773 GeV with the BESIII detector. This study, based on a significantly larger dataset than that used in previous work, presents an updated measurement of the complex U-spin breaking parameters (ρ̂) associated with various CP eigenstate resonant modes mediating the three-body decays. The magnitudes of the ρ̂ parameters range from $0.62$ to $4.45$, indicating substantial U-spin symmetry breaking. We also report the resonant fit fraction and obtain a model prediction for the average strong-phase parameters over regions of phase space for both decay modes.
ER  -