PreprintCC BY-NC-ND 4.0arXiv27 Oct 2026

Observation of χ_c1,2→ p K^- K^- Ξ̅⁺ +c.c. and search for χ_c0→ p K^- K^- Ξ̅⁺ +c.c.

BESIII Collaboration
M. Ablikim
M. N. Achasov
P. Adlarson
X. C. Ai
C. S. Akondi
R. Aliberti
A. Amoroso
Q. An
M. S. Anderson
Y. Bai
O. Bakina

771 more authors

H. R. Bao
X. L. Bao
M. Barbagiovanni
V. Batozskaya
K. Begzsuren
N. Berger
M. Berlowski
M. B. Bertani
D. Bettoni
F. Bianchi
E. Bianco
A. Bortone
I. Boyko
R. A. Briere
A. Brueggemann
D. Cabiati
H. Cai
M. H. Cai
X. Cai
X. K. Cai
G. F. Cao
N. Cao
S. A. Cetin
X. Y. Chai
J. F. Chang
T. T. Chang
G. R. Che
Y. Z. Che
C. H. Chen
Chao Chen
G. Chen
H. S. Chen
H. Y. Chen
M. L. Chen
S. J. Chen
S. M. Chen
T. Chen
W. Chen
X. R. Chen
X. T. Chen
X. Y. Chen
Y. B. Chen
Y. Q. Chen
Z. K. Chen
J. Cheng
L. N. Cheng
S. K. Choi
X. Chu

60 listed; 783 in total.

Abstract

By analyzing (2.712±0.014)×10⁹ ψ(3686) events collected by the BESIII detector, we report the first experimental study of the decays χ_cJ→ p K^- K^- Ξ̅⁺+c.c. (J=0,1,2). The decays χ_c1→ p K^- K^- Ξ̅⁺+c.c. and χ_c2→ p K^- K^- Ξ̅⁺+c.c. are observed for the first time with significances of 9.0σ each, and their branching fractions are determined to be ℬ_{χ_c1→ p K^- K^- Ξ̅⁺+c.c.} =(9.6^+2.2_−2.0±0.8)×10⁻⁶, and ℬ_{χ_c2→ p K^- K^- Ξ̅⁺+c.c.} =(7.5^+1.8_−1.5±0.5)×10⁻⁶, where the first and second uncertainties are statistical and systematic, respectively. No significant signal is observed for χ_c0→ p K^- K^- Ξ̅⁺+c.c., and an upper limit on its branching fraction of 12.7×10⁻⁶ is established at the 90\% confidence level.

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BibTeX RIS

BibTeX

@misc{collaboration2026observation,
  title = {{Observation of $χ_c1,2\to p K^- K^- \bar Ξ^+ +c.c.$ and search for $χ_c0\to p K^- K^- \bar Ξ^+ +c.c.$}},
  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 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 X. K. Cai 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 and X. Chu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.37416},
  eprint = {2610.37416},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.37416},
  note = {CC BY-NC-ND 4.0},
}

RIS

TY  - UNPB
TI  - Observation of χ_c1,2→ p K^- K^- Ξ̅^+ +c.c. and search for χ_c0→ p K^- K^- Ξ̅^+ +c.c.
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  - 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  - X. K. Cai
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
AU  - X. Chu
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.37416
UR  - https://arxiv.org/abs/2610.37416
AB  - By analyzing (2.712±0.014)×10^9 ψ(3686) events collected by the BESIII detector, we report the first experimental study of the decays χ_cJ→ p K^- K^- Ξ̅^++c.c. (J=0,1,2). The decays χ_c1→ p K^- K^- Ξ̅^++c.c. and χ_c2→ p K^- K^- Ξ̅^++c.c. are observed for the first time with significances of 9.0σ each, and their branching fractions are determined to be ℬ_χ_c1→ p K^- K^- Ξ̅^++c.c. =(9.6^+2.2_−2.0±0.8)×10^−6, and ℬ_χ_c2→ p K^- K^- Ξ̅^++c.c. =(7.5^+1.8_−1.5±0.5)×10^−6, where the first and second uncertainties are statistical and systematic, respectively. No significant signal is observed for χ_c0→ p K^- K^- Ξ̅^++c.c., and an upper limit on its branching fraction of 12.7×10^−6 is established at the 90\% confidence level.
ER  -

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