Observation of the X(2370) in J/ψ→γK⁰_SK⁰_Sπ⁰ and J/ψ→γπ⁰π⁰η

@misc{collaboration2026observation,
  title = {{Observation of the $X(2370)$ in $J/ψ\rightarrowγK^0_SK^0_Sπ^0$ and $J/ψ\rightarrowγπ^0π^0η$}},
  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 = sep,
  doi = {10.48550/arxiv.2605.26495},
  eprint = {2605.26495},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.26495},
}

TY  - UNPB
TI  - Observation of the X(2370) in J/ψ→γK^0_SK^0_Sπ^0 and J/ψ→γπ^0π^0η
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  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2605.26495
UR  - https://arxiv.org/abs/2605.26495
AB  - Based on (10087±44)×10^6 J/ψ events collected with the BESIII detector, the J/ψ→γK^0_SK^0_Sπ^0 and J/ψ→γπ^0π^0η processes are studied. The X(2370) is observed in both the K^0_SK^0_Sπ^0 and π^0π^0η invariant mass spectra, with statistical significances greater than 14σ and 20σ, respectively. By combining measurements from these processes with those from the previously reported J/ψ→γK^0_SK^0_Sη^′ process, the mass and width of the X(2370) are determined to be 2359^+13_−14 MeV/c^2 and 170^+44_−29 MeV, respectively. In addition, the decay X(2370)→ a_0(980)^0π^0 with a_0(980)^0→ π^0η is observed with a statistical significance exceeding 9σ. The properties of the X(2370)\textemdash decay pattern similarities to that of η_c, are consistent with those of a pseudoscalar glueball.
ER  -