Open Access

Observation of the $χ_{c J}$ decays into $p K^{-} \bar{Λ} η + c . c .$

M. Ablikim ¹, M. N. Achasov ^4,d, P. Adlarson ⁸⁴, X. C. Ai ⁹⁰, C. S. Akondi ^32a,32b, R. Aliberti ⁴⁰, A. Amoroso ^83a,83c, Q. An^79,66,a, Y. H. An ⁹⁰ et al. (BESIII Collaboration)

Y. H. An ⁹⁰, M. S. Anderson ⁴⁰, Y. Bai ⁶⁴, O. Bakina ⁴¹, H. R. Bao ⁷², X. L. Bao ⁵¹, M. Barbagiovanni ^83c, V. Batozskaya ^1,50, K. Begzsuren³⁶, N. Berger ⁴⁰, M. Berlowski ⁵⁰, M. B. Bertani ^31a, D. Bettoni ^32a, F. Bianchi ^83a,83c, E. Bianco^83a,83c, A. Bortone ^83a,83c, I. Boyko ⁴¹, R. A. Briere ⁵, A. Brueggemann ⁷⁶, D. Cabiati ^83a,83c, H. Cai ⁸⁵, M. H. Cai ^43,l,m, X. Cai ^1,66, A. Calcaterra ^31a, G. F. Cao ^1,72, N. Cao ^1,72, S. A. Cetin ^70a, X. Y. Chai ^52,i, J. F. Chang ^1,66, T. T. Chang ⁴⁹, G. R. Che ⁴⁹, Y. Z. Che ^1,66,72, C. H. Chen ¹⁰, Chao Chen ¹, G. Chen ¹, H. S. Chen ^1,72, H. Y. Chen ²¹, M. L. Chen ^1,66,72, S. J. Chen ⁴⁸, S. M. Chen ⁶⁹, T. Chen ^1,72, W. Chen ⁵¹, X. R. Chen ^35,72, X. T. Chen ^1,72, X. Y. Chen ^13,h, Y. B. Chen ^1,66, Y. Q. Chen ¹⁷, Z. K. Chen ⁶⁷, J. Cheng ⁵¹, L. N. Cheng ⁴⁹, S. K. Choi ¹¹, X. Chu ^13,h, G. Cibinetto ^32a, F. Cossio ^83c, J. Cottee-Meldrum ⁷¹, H. L. Dai ^1,66, J. P. Dai ⁸⁸, X. C. Dai ⁶⁹, A. Dbeyssi²⁰, R. E. de Boer ³, D. Dedovich ⁴¹, C. Q. Deng ⁸¹, Z. Y. Deng ¹, A. Denig ⁴⁰, I. Denisenko ⁴¹, M. Destefanis ^83a,83c, F. De Mori ^83a,83c, E. Di Fiore ^32a,32b, X. X. Ding ^52,i, Y. Ding ⁴⁵, Y. X. Ding ³³, J. Dong ^1,66, L. Y. Dong ^1,72, M. Y. Dong ^1,66,72, X. Dong ⁸⁵, Z. J. Dong ⁶⁷, M. C. Du ¹, S. X. Du ⁹⁰, Shaoxu Du ^13,h, X. L. Du ^13,h, Y. Q. Du ⁸⁵, Y. Y. Duan ⁶², Z. H. Duan ⁴⁸, P. Egorov ^41,b, G. F. Fan ⁴⁸, J. J. Fan ²¹, K. X. Fan ⁶⁷, Y. H. Fan ⁵¹, J. Fang ^1,66, Jin Fang ⁶⁷, S. S. Fang ^1,72, W. X. Fang ¹, Y. Q. Fang ^1,66,a, L. Fava ^83b,83c, F. Feldbauer ³, G. Felici ^31a, C. Q. Feng ^79,66, J. H. Feng ¹⁷, Q. X. Feng ^43,l,m, Y. T. Feng ^79,66, M. Fritsch ³, C. D. Fu ¹, J. L. Fu ⁷², Y. W. Fu ^1,72, H. Gao ⁷², Xu Gao ³⁹, Y. Gao ^79,66, Y. N. Gao ^52,i, Y. Y. Gao ³³, Yunong Gao ²¹, Z. Gao ⁴⁹, S. Garbolino ^83c, I. Garzia ^32a,32b, L. Ge ⁶⁴, P. T. Ge ²¹, Z. W. Ge ⁴⁸, C. Geng ⁶⁷, A. Gilman ⁷⁷, K. Goetzen ¹⁴, J. Gollub ³, J. B. Gong ^1,72, J. D. Gong ³⁹, L. Gong ⁴⁵, W. X. Gong ^1,66, W. Gradl ⁴⁰, M. Greco ^83a,83c, M. D. Gu ⁵⁷, M. H. Gu ^1,66, C. Y. Guan ^1,72, A. Q. Guo ³⁵, H. Guo ⁵⁶, J. N. Guo ^13,h, L. B. Guo ⁴⁷, M. J. Guo ⁵⁶, R. P. Guo ⁵⁵, X. Guo ⁵⁶, Y. P. Guo ^13,h, Z. Guo ^79,66, A. Guskov ^41,b, J. Gutierrez ³⁰, J. Y. Han ^79,66, T. T. Han ¹, X. Han ^79,66, F. Hanisch ³, K. D. Hao ^79,66, X. Q. Hao ²¹, F. A. Harris ⁷³, C. Z. He ^52,i, K. K. He ^18,48, K. L. He ^1,72, F. H. Heinsius ³, C. H. Heinz ⁴⁰, Y. K. Heng ^1,66,72, C. Herold ⁶⁸, P. C. Hong ³⁹, G. Y. Hou ^1,72, X. T. Hou ^1,72, Y. R. Hou ⁷², Z. L. Hou ¹, H. M. Hu ^1,72, J. F. Hu ^63,k, Q. P. Hu ^79,66, S. L. Hu ^13,h, T. Hu ^1,66,72, Y. Hu ¹, Y. X. Hu ⁸⁵, Z. M. Hu ⁶⁷, G. S. Huang ^79,66, K. X. Huang ⁶⁷, L. Q. Huang ^35,72, P. Huang ⁴⁸, X. T. Huang ⁵⁶, Y. P. Huang ¹, Y. S. Huang ⁶⁷, T. Hussain ⁸², N. Hüsken ⁴⁰, N. in der Wiesche ⁷⁶, J. Jackson ³⁰, Q. Ji ¹, Q. P. Ji ²¹, W. Ji ^1,72, X. B. Ji ^1,72, X. L. Ji ^1,66, Y. Y. Ji ¹, L. K. Jia ⁷², X. Q. Jia ⁵⁶, D. Jiang ^1,72, S. J. Jiang ¹⁰, X. S. Jiang ^1,66,72, Y. Jiang ⁷², J. B. Jiao ⁵⁶, J. K. Jiao ³⁹, Z. Jiao ²⁶, L. C. L. Jin ¹, S. Jin ⁴⁸, Y. Jin ⁷⁴, M. Q. Jing ⁵⁷, X. M. Jing ⁷², T. Johansson ⁸⁴, S. Kabana ³⁷, X. L. Kang ¹⁰, X. S. Kang ⁴⁵, B. C. Ke ⁹⁰, V. Khachatryan ³⁰, A. Khoukaz ⁷⁶, O. B. Kolcu ^70a, B. Kopf ³, L. Kröger ⁷⁶, L. Krümmel³, Y. Y. Kuang ⁸¹, M. Kuessner ¹², X. Kui ^1,72, N. Kumar ²⁹, A. Kupsc ^50,84, W. Kühn ⁴², Q. Lan ⁸¹, W. N. Lan ²¹, T. T. Lei ^79,66, M. Lellmann ⁴⁰, T. Lenz ⁴⁰, C. Li ⁵³, C. H. Li ⁴⁷, C. K. Li ⁴⁹, Chunkai Li ²², Cong Li ⁴⁹, D. M. Li ⁹⁰, F. Li ^1,66, G. Li ¹, H. B. Li ^1,72, H. J. Li ²¹, H. L. Li ⁹⁰, H. N. Li ^63,k, H. P. Li ⁴⁹, Hui Li ⁴⁹, J. N. Li ³³, J. S. Li ⁶⁷, J. W. Li ⁵⁶, K. Li ¹, K. L. Li ^43,l,m, L. J. Li ^1,72, L. K. Li ²⁷, Lei Li ⁵⁴, M. H. Li ⁴⁹, M. R. Li ^1,72, M. T. Li ⁵⁶, P. L. Li ⁷², P. R. Li ^43,l,m, Q. M. Li ^1,72, Q. X. Li ⁵⁶, R. Li ^19,35, S. Li ⁹⁰, S. X. Li ⁹⁰, S. Y. Li ⁹⁰, Shanshan Li ^28,j, T. Li ⁵⁶, T. Y. Li ⁴⁹, W. D. Li ^1,72, W. G. Li ^1,a, X. Li ^1,72, X. H. Li ^79,66, X. K. Li ^52,i, X. L. Li ⁵⁶, X. Y. Li ^79,66, X. Z. Li ⁶⁷, Y. Li ²¹, Y. H. Li ⁴⁹, Y. B. Li ⁸⁶, Y. C. Li ⁶⁷, Y. G. Li ⁷², Y. P. Li ³⁹, Z. H. Li ⁴³, Z. J. Li ⁶⁷, Z. L. Li ⁹⁰, Z. X. Li ⁴⁹, Z. Y. Li ⁸⁸, Zaiyi Li ^1,72, C. Liang ⁴⁸, H. Liang ^79,66, Y. F. Liang ⁶¹, Y. T. Liang ^35,72, Z. Z. Liang ⁶⁷, G. R. Liao ¹⁵, L. B. Liao ⁶⁷, M. H. Liao ⁶⁷, Y. P. Liao ^1,72, J. Libby ²⁹, A. Limphirat ⁶⁸, C. C. Lin ⁶², C. X. Lin ³⁵, D. X. Lin ^35,72, T. Lin ¹, B. J. Liu ¹, B. X. Liu ⁸⁵, C. Liu ³⁹, C. X. Liu ¹, F. Liu ¹, F. H. Liu ⁶⁰, Feng Liu ⁶, G. M. Liu ^63,k, H. Liu ^43,l,m, H. B. Liu ¹⁶, H. M. Liu ^1,72, Huihui Liu ²³, J. B. Liu ^79,66, J. J. Liu ²², K. Liu ^43,l,m, K. Y. Liu ⁴⁵, Ke Liu ²⁴, Kun Liu ⁸¹, L. Liu ⁴³, L. C. Liu ⁴⁹, Lu Liu ⁴⁹, M. H. Liu ³⁹, P. L. Liu ⁵⁶, Q. Liu ⁷², S. B. Liu ^79,66, T. Liu ¹, W. M. Liu ^79,66, W. T. Liu ⁴⁴, X. Liu ^43,l,m, X. K. Liu ^43,l,m, X. L. Liu ^13,h, X. P. Liu ^13,h, X. T. Liu ²², X. Y. Liu ⁸⁵, Y. Liu ^43,l,m, Y. B. Liu ⁴⁹, Yi Liu ⁹⁰, Z. A. Liu ^1,66,72, Z. D. Liu ⁸⁶, Z. Q. Liu ⁵⁶, Z. X. Liu ¹, Z. Y. Liu ⁴³, Ziqiang Liu ⁸¹, X. C. Lou ^1,66,72, H. J. Lu ²⁶, J. G. Lu ^1,66, X. L. Lu ¹⁷, Y. Lu ⁷, Y. H. Lu ^1,72, Y. P. Lu ^1,66, Z. H. Lu ^1,72, C. L. Luo ⁴⁷, J. R. Luo ⁶⁷, J. S. Luo ^1,72, M. X. Luo⁸⁹, T. Luo ^13,h, X. L. Luo ^1,66, Z. Y. Lv ²⁴, X. R. Lyu ^72,p, Y. F. Lyu ⁴⁹, Y. H. Lyu ⁹⁰, C. L. Ma ^1,72, F. C. Ma ⁴⁵, H. L. Ma ¹, Heng Ma ^28,j, J. L. Ma ^1,72, L. L. Ma ⁵⁶, L. R. Ma ⁷⁴, Q. M. Ma ¹, R. Q. Ma ^1,72, R. Y. Ma ²¹, T. Ma ^79,66, X. T. Ma ^1,72, X. Y. Ma ^1,66, F. E. Maas ²⁰, I. MacKay ⁷⁷, M. Maggiora ^83a,83c, S. Maity ³⁵, S. Malde ⁷⁷, Q. A. Malik ⁸², L. M. Mansur ⁴⁰, Y. J. Mao ^52,i, Z. P. Mao ¹, S. Marcello ^83a,83c, A. Marshall ⁷¹, F. M. Melendi ^32a,32b, Y. H. Meng ⁷², Z. X. Meng ⁷⁴, G. Mezzadri ^32a, H. Miao ^1,72, T. J. Min ⁴⁸, R. E. Mitchell ³⁰, X. H. Mo ^1,66,72, A. F. Mohammad ⁴⁸, B. Moses ³⁰, N. Yu. Muchnoi ^4,d, J. Muskalla ⁴⁰, Y. Nefedov ⁴¹, F. Nerling ^20,f, H. Neuwirth ⁷⁶, Z. Ning ^1,66, S. Nisar ³⁴, Q. L. Niu ^43,l,m, W. D. Niu ^13,h, Y. Niu ⁵⁶, C. Normand ⁷¹, S. L. Olsen ^11,72, Q. Ouyang ^1,66,72, I. V. Ovtin ⁴, S. Pacetti ^31b,31c, Y. Pan ⁶⁴, C. Y. Pang ¹⁵, A. Pathak ¹¹, Y. P. Pei ^79,66, M. Pelizaeus ³, G. L. Peng ^79,66, H. P. Peng ^79,66, X. J. Peng ^43,l,m, Y. Y. Peng ^43,l,m, K. Peters ^14,f, K. Petridis ⁷¹, J. L. Ping ⁴⁷, R. G. Ping ^1,72, S. Plura ⁴⁰, V. Prasad ³⁹, L. Pöpping ³, F. Z. Qi ¹, H. R. Qi ⁶⁹, L. Y. Qian ^1,72, S. Qian ^1,66, W. B. Qian ⁷², C. F. Qiao ⁷², J. H. Qiao ²¹, J. J. Qin ⁸¹, J. L. Qin ⁶², L. Q. Qin ¹⁵, L. Y. Qin ^79,66, P. B. Qin ⁸¹, X. P. Qin ⁴⁴, X. S. Qin ⁵⁶, Z. H. Qin ^1,66, J. F. Qiu ¹, Z. H. Qu ⁸¹, J. Rademacker ⁷¹, K. Ravindran ⁷⁵, C. F. Redmer ⁴⁰, A. Rivetti ^83c, M. Rolo ^83c, G. Rong ^1,72, S. S. Rong ^1,72, F. Rosini ^31b,31c, Ch. Rosner ²⁰, M. Q. Ruan ^1,66, W. R. Ruangyoo ⁶⁸, N. Salone ⁸⁰, A. Sarantsev ^41,e, Y. Schelhaas ⁴⁰, M. Schernau ³⁷, K. Schoenning ⁸⁴, M. Scodeggio ^32a, W. Shan ²⁷, X. Y. Shan ^79,66, Z. J. Shang ^43,l,m, J. F. Shangguan ¹⁸, L. G. Shao ^1,72, M. Shao ^79,66, C. P. Shen ^13,h, H. F. Shen ³⁰, W. H. Shen ⁷², X. Y. Shen ^1,72, B. A. Shi ⁷², Ch. Y. Shi ^88,c, H. Shi ^79,66, J. L. Shi ^8,q, J. Y. Shi ¹, M. H. Shi ⁹⁰, S. Shi ^1,72, S. Y. Shi ⁸¹, X. Shi ^1,66, H. L. Song ^79,66, J. J. Song ²¹, M. H. Song ⁴³, T. Z. Song ⁶⁷, W. M. Song ³⁹, Y. X. Song ^52,i,n, Zirong Song ^28,j, S. Sosio ^83a,83c, S. Spataro ^83a,83c, S. Stansilaus ⁷⁷, F. Stieler ⁴⁰, M. Stolte ³, S. S Su ⁴⁵, G. B. Sun ⁸⁵, G. X. Sun ¹, H. Sun ⁷², H. K. Sun ¹, J. F. Sun ²¹, K. Sun ⁶⁹, L. Sun ⁸⁵, R. Sun ⁷⁹, S. S. Sun ^1,72, T. Sun ^58,g, W. Y. Sun ⁵⁷, Y. C. Sun ⁸⁵, Y. H. Sun ³³, Y. J. Sun ^79,66, Y. Z. Sun ¹, Z. Q. Sun ^1,72, Z. T. Sun ⁵⁶, H. Tabaharizato ¹, N. T. Tagsinsit ⁶⁸, C. J. Tang⁶¹, G. Y. Tang ¹, J. Tang ⁶⁷, J. J. Tang ^79,66, L. F. Tang ⁴⁴, Y. A. Tang ⁸⁵, Z. H. Tang ^1,72, L. Y. Tao ⁸¹, M. Tat ⁷⁷, J. X. Teng ^79,66, J. Y. Tian ^79,66, W. H. Tian ⁶⁷, Y. Tian ³⁵, Z. F. Tian ⁸⁵, K. Yu. Todyshev ⁴, I. Uman ^70b, E. van der Smagt ³, B. Wang ⁶⁷, Bin Wang ¹, Bo Wang ^79,66, C. Wang ^43,l,m, Chao Wang ²¹, Cong Wang ²⁴, D. Y. Wang ^52,i, F. K. Wang ⁶⁷, H. J. Wang ^43,l,m, H. R. Wang ⁸⁷, J. Wang ¹⁰, J. H. Wang ¹, J. J. Wang ⁸⁵, J. P. Wang ³⁸, K. Wang ^1,66, L. L. Wang ¹, L. W. Wang ³⁹, M. Wang ⁵⁶, Mi Wang ^79,66, N. Y. Wang ⁷², P. Wang ²², S. Wang ^43,l,m, Shun Wang ⁶⁵, T. Wang ^13,h, W. Wang ⁶⁷, W. P. Wang ⁴⁰, X. F. Wang ^43,l,m, X. L. Wang ^13,h, X. N. Wang ^1,72, Xin Wang ^28,j, Y. Wang ¹, Y. D. Wang ⁵¹, Y. F. Wang ^1,9,72, Y. H. Wang ^43,l,m, Y. J. Wang ^79,66, Y. L. Wang ²¹, Y. N. Wang ⁵¹, Yanning Wang ⁸⁵, Yaqian Wang ¹⁹, Yi Wang ⁶⁹, Yuan Wang ^19,35, Z. Wang ^1,66, Z. L. Wang ², Z. Q. Wang ^13,h, Z. Y. Wang ^1,72, Zhi Wang ⁴⁹, Ziyi Wang ⁷², D. Wei ⁴⁹, D. H. Wei ¹⁵, D. J. Wei ⁷⁴, H. R. Wei ⁴⁹, F. Weidner ⁷⁶, H. R. Wen ³⁵, S. P. Wen ¹, U. Wiedner ³, G. Wilkinson ⁷⁷, J. F. Wu ^1,9, L. H. Wu ¹, L. J. Wu ²¹, Lianjie Wu ²¹, S. G. Wu ^1,72, S. M. Wu ⁷², X. W. Wu ⁸¹, Z. Wu ^1,66, H. L. Xia ^79,66, L. Xia ^79,66, B. H. Xiang ^1,72, D. Xiao ^43,l,m, G. Y. Xiao ⁴⁸, H. Xiao ⁸¹, Y. L. Xiao ^13,h, Z. J. Xiao ⁴⁷, C. Xie ⁴⁸, K. J. Xie ^1,72, Y. Xie ⁵⁶, Y. G. Xie ^1,66, Y. H. Xie ⁶, Z. P. Xie ^79,66, T. Y. Xing ^1,72, D. B. Xiong ¹, G. F. Xu ¹, H. Y. Xu ², Q. J. Xu ¹⁸, Q. N. Xu ³³, T. D. Xu ⁸¹, X. P. Xu ⁶², Y. Xu ^13,h, Y. C. Xu ⁸⁷, Z. S. Xu ⁷², F. Yan ²⁵, L. Yan ^13,h, W. B. Yan ^79,66, W. C. Yan ⁹⁰, W. H. Yan ⁶, W. P. Yan ²¹, X. Q. Yan ^13,h, Y. Y. Yan ⁶⁸, H. J. Yang ^58,g, H. L. Yang ³⁹, H. X. Yang ¹, J. H. Yang ⁴⁸, L. Y. Yang ^1,72, R. J. Yang ²¹, X. Y. Yang ⁷⁴, Y. Yang ^13,h, Y. G. Yang ⁵⁷, Y. H. Yang ⁴⁹, Y. M. Yang ⁹⁰, Y. Q. Yang ¹⁰, Y. Z. Yang ²¹, Youhua Yang ⁴⁸, Z. Y. Yang ⁸¹, W. J. Yao ⁶, Z. P. Yao ⁵⁶, M. Ye ^1,66, M. H. Ye ^9,a, Z. J. Ye ^63,k, K. Yi ⁴⁷, Junhao Yin ⁴⁹, Qiqin Yin ⁴⁸, Z. Y. You ⁶⁷, B. X. Yu ^1,66,72, C. X. Yu ⁴⁹, G. Yu ¹⁴, J. S. Yu ^28,j, L. W. Yu ^13,h, T. Yu ⁸¹, X. D. Yu ^52,i, Y. C. Yu ⁹⁰, Yongchao Yu ⁴³, C. Z. Yuan ^1,72, H. Yuan ^1,72, J. Yuan ³⁹, Jie Yuan ⁵¹, L. Yuan ², M. K. Yuan ^13,h, S. H. Yuan ⁸¹, Y. Yuan ^1,72, C. X. Yue ⁴⁴, Ying Yue ²¹, A. A. Zafar ⁸², F. R. Zeng ⁵⁶, S. H. Zeng ⁷¹, X. Zeng ^13,h, Y. J. Zeng ^1,72, Yujie Zeng ⁶⁷, Y. C. Zhai ⁵⁶, Y. H. Zhan ⁶⁷, B. L. Zhang ^1,72, B. X. Zhang ^1,a, D. H. Zhang ⁴⁹, G. Y. Zhang ²¹, Gengyuan Zhang ^1,72, H. Zhang ^79,66, H. C. Zhang ^1,66,72, H. H. Zhang ⁶⁷, H. L. Zhang ⁴⁹, H. Q. Zhang ^1,66,72, H. R. Zhang ^79,66, H. Y. Zhang ^1,66, Han Zhang ⁹⁰, J. Zhang ⁶⁷, J. J. Zhang ⁵⁹, J. L. Zhang ²², J. Q. Zhang ⁴⁷, J. S. Zhang ^13,h, J. W. Zhang ^1,66,72, J. X. Zhang ^43,l,m, J. Y. Zhang ¹, J. Z. Zhang ^1,72, Jianyu Zhang ⁵⁰, Jin Zhang ⁵⁴, Jiyuan Zhang ^13,h, L. M. Zhang ⁶⁹, Lei Zhang ⁴⁸, N. Zhang ³⁹, P. Zhang ^1,9, Q. Zhang ²¹, Q. Y. Zhang ³⁹, Q. Z. Zhang ⁷², R. Y. Zhang ^43,l,m, S. H. Zhang ^1,72, S. N. Zhang ⁷⁷, Shulei Zhang ^28,j, X. M. Zhang ¹, X. Y. Zhang ⁵⁶, Y. T. Zhang ⁹⁰, Y. H. Zhang ^1,66, Y. P. Zhang ^79,66, Yao Zhang ¹, Yu Zhang ⁸¹, Yu Zhang ⁶⁷, Z. Zhang ³⁵, Z. D. Zhang ¹, Z. H. Zhang ¹, Z. L. Zhang ³⁹, Z. X. Zhang ²¹, Z. Y. Zhang ⁸⁵, Z. Z. Zhang ¹, Zh. Zh. Zhang ²¹, Zhaoke Zhang ^1,72, Zhilong Zhang ⁶², Ziyang Zhang ⁵¹, Ziyu Zhang ⁴⁹, G. Zhao ¹, J.-P. Zhao ⁷², J. Y. Zhao ^1,72, J. Z. Zhao ^1,66, L. Zhao ¹, Lei Zhao ^79,66, M. G. Zhao ⁴⁹, R. P. Zhao ⁷², S. J. Zhao ⁹⁰, Y. B. Zhao ^1,66, Y. L. Zhao ⁶², Y. P. Zhao ⁵¹, Y. X. Zhao ^35,72, Z. G. Zhao ^79,66, A. Zhemchugov ^41,b, B. Zheng ⁸¹, B. M. Zheng ³⁹, J. P. Zheng ^1,66, W. J. Zheng ^1,72, W. Q. Zheng ¹⁰, X. R. Zheng ²¹, Y. H. Zheng ^72,p, B. Zhong ⁴⁷, C. Zhong ²¹, X. Zhong ⁴⁶, H. Zhou ^40,56,o, J. Q. Zhou ³⁹, S. Zhou ⁶, X. Zhou ⁸⁵, X. K. Zhou ⁶, X. R. Zhou ^79,66, X. Y. Zhou ⁴⁴, Y. X. Zhou ⁸⁷, Y. Z. Zhou ²¹, A. N. Zhu ⁷², J. Zhu ⁴⁹, K. Zhu ¹, K. J. Zhu ^1,66,72, K. S. Zhu ^13,h, L. X. Zhu ⁷², Lin Zhu ²¹, S. H. Zhu ⁷⁸, T. J. Zhu ^13,h, W. D. Zhu ^13,h, W. J. Zhu ¹, W. Z. Zhu ²¹, Y. C. Zhu ^79,66, Z. A. Zhu ^1,72, X. Y. Zhuang ⁴⁹, M. Zhuge ⁵⁶, J. H. Zou ¹, and J. Zu ³⁵ (BESIII Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People’s Republic of China
²Beihang University, Beijing 100191, People’s Republic of China
³Bochum Ruhr-University, D-44780 Bochum, Germany
⁴Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
⁵Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁶Central China Normal University, Wuhan 430079, People’s Republic of China
⁷Central South University, Changsha 410083, People’s Republic of China
⁸Chengdu University of Technology, Chengdu 610059, People’s Republic of China
⁹China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
¹⁰China University of Geosciences, Wuhan 430074, People’s Republic of China
¹¹Chung-Ang University, Seoul, 06974, Republic of Korea
¹²College of William and Mary, Williamsburg, Virginia 23185, USA
¹³Fudan University, Shanghai 200433, People’s Republic of China
¹⁴GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
¹⁵Guangxi Normal University, Guilin 541004, People’s Republic of China
¹⁶Guangxi University, Nanning 530004, People’s Republic of China
¹⁷Guangxi University of Science and Technology, Liuzhou 545006, People’s Republic of China
¹⁸Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
¹⁹Hebei University, Baoding 071002, People’s Republic of China
²⁰Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
²¹Henan Normal University, Xinxiang 453007, People’s Republic of China
²²Henan University, Kaifeng 475004, People’s Republic of China
²³Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
²⁴Henan University of Technology, Zhengzhou 450001, People’s Republic of China
²⁵Hengyang Normal University, Hengyang 421002, People’s Republic of China
²⁶Huangshan College, Huangshan 245000, People’s Republic of China
²⁷Hunan Normal University, Changsha 410081, People’s Republic of China
²⁸Hunan University, Changsha 410082, People’s Republic of China
²⁹Indian Institute of Technology Madras, Chennai 600036, India
³⁰Indiana University, Bloomington, Indiana 47405, USA
^31aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
^31bINFN Sezione di Perugia, I-06100, Perugia, Italy
^31cUniversity of Perugia, I-06100, Perugia, Italy
^32aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
^32bUniversity of Ferrara, I-44122, Ferrara, Italy
³³Inner Mongolia University, Hohhot 010021, People’s Republic of China
³⁴Institute of Business Administration, University Road, Karachi, 75270 Pakistan
³⁵Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
³⁶Institute of Physics and Technology, Mongolian Academy of Sciences, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
³⁷Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica 1000000, Chile
³⁸Jiangsu Ocean University, Lianyungang 222005, People’s Republic of China
³⁹Jilin University, Changchun 130012, People’s Republic of China
⁴⁰Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
⁴¹Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
⁴²Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
⁴³Lanzhou University, Lanzhou 730000, People’s Republic of China
⁴⁴Liaoning Normal University, Dalian 116029, People’s Republic of China
⁴⁵Liaoning University, Shenyang 110036, People’s Republic of China
⁴⁶Longyan University, Longyan 364000, People’s Republic of China
⁴⁷Nanjing Normal University, Nanjing 210023, People’s Republic of China
⁴⁸Nanjing University, Nanjing 210093, People’s Republic of China
⁴⁹Nankai University, Tianjin 300071, People’s Republic of China
⁵⁰National Centre for Nuclear Research, Warsaw 02-093, Poland
⁵¹North China Electric Power University, Beijing 102206, People’s Republic of China
⁵²Peking University, Beijing 100871, People’s Republic of China
⁵³Qufu Normal University, Qufu 273165, People’s Republic of China
⁵⁴Renmin University of China, Beijing 100872, People’s Republic of China
⁵⁵Shandong Normal University, Jinan 250014, People’s Republic of China
⁵⁶Shandong University, Jinan 250100, People’s Republic of China
⁵⁷Shandong University of Technology, Zibo 255000, People’s Republic of China
⁵⁸Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁵⁹Shanxi Normal University, Linfen 041004, People’s Republic of China
⁶⁰Shanxi University, Taiyuan 030006, People’s Republic of China
⁶¹Sichuan University, Chengdu 610064, People’s Republic of China
⁶²Soochow University, Suzhou 215006, People’s Republic of China
⁶³South China Normal University, Guangzhou 510006, People’s Republic of China
⁶⁴Southeast University, Nanjing 211100, People’s Republic of China
⁶⁵Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
⁶⁶State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁶⁷Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁶⁸Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁶⁹Tsinghua University, Beijing 100084, People’s Republic of China
^70aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey
^70bNear East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey
⁷¹University of Bristol, H H Wills Physics Laboratory, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
⁷²University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁷³University of Hawaii, Honolulu, Hawaii 96822, USA
⁷⁴University of Jinan, Jinan 250022, People’s Republic of China
⁷⁵University of La Serena, Avenida Raúl Bitrán 1305, La Serena, Chile
⁷⁶University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany
⁷⁷University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
⁷⁸University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁷⁹University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁸⁰University of Silesia in Katowice, Institute of Physics, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
⁸¹University of South China, Hengyang 421001, People’s Republic of China
⁸²University of the Punjab, Lahore-54590, Pakistan
^83aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy
^83bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
^83cINFN, I-10125, Turin, Italy
⁸⁴Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁸⁵Wuhan University, Wuhan 430072, People’s Republic of China
⁸⁶Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an, Shaanxi 710049, People’s Republic of China
⁸⁷Yantai University, Yantai 264005, People’s Republic of China
⁸⁸Yunnan University, Kunming 650500, People’s Republic of China
⁸⁹Zhejiang University, Hangzhou 310027, People’s Republic of China
⁹⁰Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^*Full author list given at the end of the article.
^aDeceased.
^bAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^cAlso at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia.
^dAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
^eAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
^fAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^gAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
^hAlso at Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, People’s Republic of China.
ⁱAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
^jAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
^kAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
^lAlso at MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^mAlso at Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People’s Republic of China.
ⁿAlso at Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
^oAlso at Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany.
^pAlso at Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.
^qAlso at Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu 610059, People’s Republic of China.

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Phys. Rev. D 114, 054045 – Published 28 September, 2026

DOI: https://doi.org/10.1103/ss6l-7c3r

Abstract

By analyzing $(2712.4 \pm 14.3) \times 10^{6} ψ (3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays $χ_{c J} \to p K^{-} \bar{Λ} η + c . c$ . ( $J = 0$ , 1, 2) are observed for the first time, with statistical significances exceeding $5 σ$ for all three $χ_{c J}$ states. The measured branching fractions are $B (χ_{c 0} \to p K^{-} \bar{Λ} η + c . c .) = (5.3 \pm 0.7 \pm 0.5) \times 10^{- 5}$ , $B (χ_{c 1} \to p K^{-} \bar{Λ} η + c . c .) = (9.8 \pm 0.6 \pm 0.6) \times 10^{- 5}$ , and $B (χ_{c 2} \to p K^{-} \bar{Λ} η + c . c .) = (9.3 \pm 0.6 \pm 0.6) \times 10^{- 5}$ , where the first uncertainties are statistical and the second are systematic. Structures consistent with the known hyperon resonances $Λ (1520)$ and $\bar{Λ} (1690)$ are seen in the $p K^{-}$ and $\bar{Λ} η$ invariant mass spectra, respectively. The reported branching fractions include both resonant and nonresonant 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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Phys. Rev. D 114, 054045– Published 28 September, 2026

Vol. 114, Iss. 5 — 1 September 2026

Received 7 July 2026
Accepted 27 August 2026

DOI: https://doi.org/10.1103/ss6l-7c3r

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Observation of the $χ_{c J}$ decays into $p K^{-} \bar{Λ} η + c . c .$

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Observation of the χcJ decays into pK−Λ¯η+c.c.

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Observation of the $χ_{c J}$ decays into $p K^{-} \bar{Λ} η + c . c .$