Observation of the χcJ decays into pK−Λ̅η+c.c.
Abstract
By analyzing (2712.4 ± 14.3) × 106 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays χcJ → pK−Λ̅η+ c.c. (J=0,1,2) are observed for the first time, with statistical significances exceeding 5σ for all three χcJ states. The measured branching fractions are ℬ(χc0 → pK−Λ̅η+ c.c.) = (5.3 ± 0.7 ± 0.5) × 10−5, ℬ(χc1 → pK−Λ̅η+ c.c.) = (9.8 ± 0.6 ± 0.6) × 10−5, and ℬ(χc2 → pK−Λ̅η+ c.c.) = (9.3 ± 0.6 ± 0.6) × 10−5, where the first uncertainties are statistical and the second are systematic. Structures consistent with the known hyperon resonances Λ(1520) and Λ̅(1690) are seen in the pK− and Λ̅η invariant mass spectra, respectively. The reported branching fractions include both resonant and non-resonant contributions. These results provide new experimental information on hadronic decays of P-wave charmonium states and contribute to the understanding of baryon production and hadronization dynamics in the nonperturbative QCD regime.
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BibTeX
@misc{collaboration2026observation,
title = {{Observation of the $χ_cJ$ decays into $pK^-\barΛη+\mathrmc.c.$}},
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 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 = aug,
doi = {10.48550/arxiv.2607.05041},
eprint = {2607.05041},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.05041},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of the χ_cJ decays into pK^−Λ̅η+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 - 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 - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2607.05041
UR - https://arxiv.org/abs/2607.05041
AB - By analyzing (2712.4 ± 14.3) × 10^6 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays χ_cJ → pK^−Λ̅η+ c.c. (J=0,1,2) are observed for the first time, with statistical significances exceeding 5σ for all three χ_cJ states. The measured branching fractions are ℬ(χ_c0 → pK^−Λ̅η+ c.c.) = (5.3 ± 0.7 ± 0.5) × 10^−5, ℬ(χ_c1 → pK^−Λ̅η+ c.c.) = (9.8 ± 0.6 ± 0.6) × 10^−5, and ℬ(χ_c2 → pK^−Λ̅η+ c.c.) = (9.3 ± 0.6 ± 0.6) × 10^−5, where the first uncertainties are statistical and the second are systematic. Structures consistent with the known hyperon resonances Λ(1520) and Λ̅(1690) are seen in the pK^− and Λ̅η invariant mass spectra, respectively. The reported branching fractions include both resonant and non-resonant contributions. These results provide new experimental information on hadronic decays of P-wave charmonium states and contribute to the understanding of baryon production and hadronization dynamics in the nonperturbative QCD regime.
ER -