Amplitude analysis of ψ(3686) radiative decays into π⁰ π⁰ system

@misc{collaboration2026amplitude,
  title = {{Amplitude analysis of $ψ(3686)$ radiative decays into $π^0 π^0$ system}},
  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 Q. An and Y. H. 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 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 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 and L. N. Cheng and S. K. Choi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.17967},
  eprint = {2610.17967},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.17967},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Amplitude analysis of ψ(3686) radiative decays into π^0 π^0 system
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  - Q. An
AU  - Y. H. 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  - 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  - 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
AU  - L. N. Cheng
AU  - S. K. Choi
PY  - 2026
DA  - 2026/10/13
PB  - arXiv
DO  - 10.48550/arxiv.2610.17967
UR  - https://arxiv.org/abs/2610.17967
AB  - A model-independent amplitude analysis of the π^0 π^0 system produced in radiative ψ(3686) decays is presented. The analysis is based on the unique dataset of (2712.4±14.3)×10^6 ψ(3686) decays collected by the BESIII detector. Scalar and tensor partial-wave contributions are obtained as piecewise functions of M_inv(π^0 π^0) with minimal model assumptions. The observed contribution of the scalar partial wave exhibits similar behavior to the one reported in the study of radiative J/ψ decays, while the tensor contributions provide no evidence for resonance-like structures except for the clearly visible f_2(1270). The results are presented in the form of log-likelihood scans in M_inv(π^0 π^0) bins, which preserve all the statistical information and account for relevant systematic uncertainties. The model-independent description provided in this paper allows to combine the presented results with other related data in the development of phenomenological models.
ER  -