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arXiv · 2610.37416

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

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·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·G. Cibinetto·F. Cossio·J. Cottee-Meldrum·H. L. Dai·J. P. Dai·X. C. Dai·A. Dbeyssi·R. E. de Boer·D. Dedovich·Z. Y. Deng·A. Denig·I. Denisenko·M. Destefanis·F. De Mori·E. Di Fiore·X. X. Ding·Y. Ding·Y. X. Ding·J. Dong·L. Y. Dong·M. Y. Dong·X. Dong·Z. J. Dong·M. C. Du·S. X. Du·Shaoxu Du·X. L. Du·Y. Q. Du·Y. Y. Duan·Z. H. Duan·P. Egorov·G. F. Fan·J. J. Fan·K. X. Fan·Y. H. Fan·J. Fang·Jin Fang·S. S. Fang·W. X. Fang·Y. Q. Fang
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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.

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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, 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, G. Cibinetto, F. Cossio, J. Cottee-Meldrum, H. L. Dai, J. P. Dai, X. C. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, Z. Y. Deng, A. Denig, I. Denisenko, M. Destefanis, F. De Mori, E. Di Fiore, X. X. Ding, Y. Ding, Y. X. Ding, J. Dong, L. Y. Dong, M. Y. Dong, X. Dong, Z. J. Dong, M. C. Du, S. X. Du, Shaoxu Du, X. L. Du, Y. Q. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, G. F. Fan, J. J. Fan, K. X. Fan, Y. H. Fan, J. Fang, Jin Fang, S. S. Fang, W. X. Fang, Y. Q. Fang. 2026-10-27. Observation of $χ_{c1,2}\to p K^- K^- \bar Ξ^{+} +c.c.$ and search for $χ_{c0}\to p K^- K^- \bar Ξ^{+} +c.c.$. https://arxiv.org/abs/2610.37416

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