Observation of $χ_{c1,2}\to p K^- K^- \bar Ξ^{+} +c.c.$ and search for $χ_{c0}\to p K^- K^- \bar Ξ^{+} +c.c.$

By analyzing $(2.712\pm0.014)\times10^9$ $ψ(3686)$ events collected by the BESIII detector, we report the first experimental study of the decays $χ_{cJ}\to p K^- K^- \bar Ξ^{+}+c.c.~(J=0,1,2)$. The decays $χ_{c1}\to p K^- K^- \bar Ξ^{+}+c.c.$ and $χ_{c2}\to p K^- K^- \bar Ξ^{+}+c.c.$ are observed for the first time with significances of $9.0σ$ each, and their branching fractions are determined to be $\mathcal{B}_{χ_{c1}\to p K^- K^- \bar Ξ^{+}+c.c.} =(9.6^{+2.2}_{-2.0}\pm0.8)\times10^{-6}$, and $\mathcal{B}_{χ_{c2}\to p K^- K^- \bar Ξ^{+}+c.c.} =(7.5^{+1.8}_{-1.5}\pm0.5)\times10^{-6}$, where the first and second uncertainties are statistical and systematic, respectively. No significant signal is observed for $χ_{c0}\to p K^- K^- \bar Ξ^{+}+c.c.$, and an upper limit on its branching fraction of $12.7\times10^{-6}$ is established at the 90\% confidence level.

Authors

Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-27
DOI
https://doi.org/10.48550/arxiv.2610.37416
Primary Topic
Quantum Chromodynamics and Particle Interactions
Type
preprint
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preprint

Observation of $χ_{c1,2}\to p K^- K^- \bar Ξ^{+} +c.c.$ and search for $χ_{c0}\to p K^- K^- \bar Ξ^{+} +c.c.$

W. X. Fang, S. M. Chen, K. Begzsuren, V. Batozskaya et al.
arXiv (Cornell University)
Quantum Chromodynamics and Particle Interactions
preprint

Observation of $χ_{c1,2}\to p K^- K^- \bar Ξ^{+} +c.c.$ and search for $χ_{c0}\to p K^- K^- \bar Ξ^{+} +c.c.$

W. X. Fang, S. M. Chen, K. Begzsuren, V. Batozskaya, G. F. Cao, S. S. Fang, D. Bettoni, H. L. Dai, Z. H. Duan, S. J. Chen, G Cibinetto, S. K. Choi, I. Boyko, E. Bianco, M. L. Chen, A. Brueggemann, Roy A. Briere, G. R. Che, A. Bortone, E. Di Fiore, X. C. Ai, Fabrizio Bianchi, A. G. Denig, D. Dedovich, M Destefanis, BESIII Collaboration, Y. Z. Che, R. Aliberti, M. Y. Dong, M. N. Achasov, M. Berlowski, M. C. Du, X. Y. Chai, S. X. Du, T. T. Chang, J. Cottee-Meldrum, S Gevrek Çetin, R. E. de Boer, F. Cossio, H. S. Chen, A. Amoroso, K. X. Fan, P Adlarson, M. Ablikim, M. H. Cai, M. Barbagiovanni, M. B. Bertani, M. S. Anderson, C. S. Akondi, X. L. Bao, G. F. Fan, Q. An, P. Egorov, A. Dbeyssi, O. Bakina, I. Denisenko, H. R. Bao, N. Berger, D. Cabiati, Z. Y. Deng, Y. Q. Fang, F. De Mori, L. Y. Dong, X. L. Du, Z. K. Chen, Y. Q. Chen, Jin Fang, J. J. Fan, H. Cai, J. Fang, J. P. Dai, J. Cheng, W. Chen, L. N. Cheng, J. F. Chang, Y. Bai, G. Chen, X. Chu, Y. Q. Du, Y. H. Fan, X. K. Cai, X. Dong, C. H. Chen, H. Y. Chen, T. Chen, N. Cao, X. X. Ding, Y. X. Ding, Z. J. Dong, X. C. Dai, Chao Chen, X. Y. Chen, Shaoxu Du, J. Dong, Y. Y. Duan
preprint en

Abstract

By analyzing $(2.712\pm0.014)\times10^9$ $ψ(3686)$ events collected by the BESIII detector, we report the first experimental study of the decays $χ_{cJ}\to p K^- K^- \bar Ξ^{+}+c.c.~(J=0,1,2)$. The decays $χ_{c1}\to p K^- K^- \bar Ξ^{+}+c.c.$ and $χ_{c2}\to p K^- K^- \bar Ξ^{+}+c.c.$ are observed for the first time with significances of $9.0σ$ each, and their branching fractions are determined to be $\mathcal{B}_{χ_{c1}\to p K^- K^- \bar Ξ^{+}+c.c.} =(9.6^{+2.2}_{-2.0}\pm0.8)\times10^{-6}$, and $\mathcal{B}_{χ_{c2}\to p K^- K^- \bar Ξ^{+}+c.c.} =(7.5^{+1.8}_{-1.5}\pm0.5)\times10^{-6}$, where the first and second uncertainties are statistical and systematic, respectively. No significant signal is observed for $χ_{c0}\to p K^- K^- \bar Ξ^{+}+c.c.$, and an upper limit on its branching fraction of $12.7\times10^{-6}$ is established at the 90\% confidence level.

arXiv (Cornell University)
Quantum Chromodynamics and Particle Interactions
DOIOpen Access PDFOpenAlex
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