Letter
Open Access

Experimental study of the reaction $Ξ^{0} n \to Λ Λ X$ using $Ξ^{0}$ -nucleus scattering

M. Ablikim ¹, M. N. Achasov ^4,a, P. Adlarson ⁷⁷, X. C. Ai ⁸², R. Aliberti ³⁶, A. Amoroso ^76a,76c, Q. An^59,73,b, Y. Bai ⁵⁸, O. Bakina ³⁷ et al. (BESIII Collaboration)

O. Bakina ³⁷, Y. Ban ^47,c, H.-R. Bao ⁶⁵, V. Batozskaya ^1,45, K. Begzsuren³³, N. Berger ³⁶, M. Berlowski ⁴⁵, M. Bertani ^29a, D. Bettoni ^30a, F. Bianchi ^76a,76c, E. Bianco^76a,76c, A. Bortone ^76a,76c, I. Boyko ³⁷, R. A. Briere ⁵, A. Brueggemann ⁷⁰, H. Cai ⁷⁸, M. H. Cai ^39,d,e, X. Cai ^1,59, A. Calcaterra ^29a, G. F. Cao ^1,65, N. Cao ^1,65, S. A. Cetin ^63a, X. Y. Chai ^47,c, J. F. Chang ^1,59, G. R. Che ⁴⁴, Y. Z. Che ^1,59,65, C. H. Chen ⁹, Chao Chen ⁵⁶, G. Chen ¹, H. S. Chen ^1,65, H. Y. Chen ²¹, M. L. Chen ^1,59,65, S. J. Chen ⁴³, S. L. Chen ⁴⁶, S. M. Chen ⁶², T. Chen ^1,65, X. R. Chen ^32,65, X. T. Chen ^1,65, X. Y. Chen ^12,f, Y. B. Chen ^1,59, Y. Q. Chen ^16,35, Z. Chen ²⁵, Z. J. Chen ^26,g, Z. K. Chen ⁶⁰, J. C. Cheng ⁴⁶, S. K. Choi ¹⁰, X. Chu ^12,f, G. Cibinetto ^30a, F. Cossio ^76c, J. Cottee-Meldrum ⁶⁴, J. J. Cui ⁵¹, H. L. Dai ^1,59, J. P. Dai ⁸⁰, A. Dbeyssi¹⁹, R. E. de Boer ³, D. Dedovich ³⁷, C. Q. Deng ⁷⁴, Z. Y. Deng ¹, A. Denig ³⁶, I. Denysenko ³⁷, M. Destefanis ^76a,76c, F. De Mori ^76a,76c, B. Ding ^1,68, X. X. Ding ^47,c, Y. Ding ⁴¹, Y. Ding ³⁵, Y. X. Ding ³¹, J. Dong ^1,59, L. Y. Dong ^1,65, M. Y. Dong ^1,59,65, X. Dong ⁷⁸, M. C. Du ¹, S. X. Du ⁸², S. X. Du ^12,f, Y. Y. Duan ⁵⁶, Z. H. Duan ⁴³, P. Egorov ^37,h, G. F. Fan ⁴³, J. J. Fan ²⁰, Y. H. Fan ⁴⁶, J. Fang ^1,59, J. Fang ⁶⁰, S. S. Fang ^1,65, W. X. Fang ¹, Y. Q. Fang^1,59, L. Fava ^76b,76c, F. Feldbauer ³, G. Felici ^29a, C. Q. Feng ^59,73, J. H. Feng ¹⁶, L. Feng ^39,d,e, Q. X. Feng ^39,d,e, Y. T. Feng ^59,73, M. Fritsch ³, C. D. Fu ¹, J. L. Fu ⁶⁵, Y. W. Fu ^1,65, H. Gao ⁶⁵, X. B. Gao ⁴², Y. Gao ^59,73, Y. N. Gao ^47,c, Y. N. Gao ²⁰, Y. Y. Gao ³¹, S. Garbolino ^76c, I. Garzia ^30a,30b, L. Ge ⁵⁸, P. T. Ge ²⁰, Z. W. Ge ⁴³, C. Geng ⁶⁰, E. M. Gersabeck ⁶⁹, A. Gilman ⁷¹, K. Goetzen ¹³, J. D. Gong ³⁵, L. Gong ⁴¹, W. X. Gong ^1,59, W. Gradl ³⁶, S. Gramigna ^30a,30b, M. Greco ^76a,76c, M. H. Gu ^1,59, Y. T. Gu ¹⁵, C. Y. Guan ^1,65, A. Q. Guo ³², L. B. Guo ⁴², M. J. Guo ⁵¹, R. P. Guo ⁵⁰, Y. P. Guo ^12,f, A. Guskov ^37,h, J. Gutierrez ²⁸, K. L. Han ⁶⁵, T. T. Han ¹, F. Hanisch ³, K. D. Hao ^59,73, X. Q. Hao ²⁰, F. A. Harris ⁶⁷, K. K. He ⁵⁶, K. L. He ^1,65, F. H. Heinsius ³, C. H. Heinz ³⁶, Y. K. Heng ^1,59,65, C. Herold ⁶¹, P. C. Hong ³⁵, G. Y. Hou ^1,65, X. T. Hou ^1,65, Y. R. Hou ⁶⁵, Z. L. Hou ¹, H. M. Hu ^1,65, J. F. Hu ^57,i, Q. P. Hu ^59,73, S. L. Hu ^12,f, T. Hu ^1,59,65, Y. Hu ¹, Z. M. Hu ⁶⁰, G. S. Huang ^59,73, K. X. Huang ⁶⁰, L. Q. Huang ^32,65, P. Huang ⁴³, X. T. Huang ⁵¹, Y. P. Huang ¹, Y. S. Huang ⁶⁰, T. Hussain ⁷⁵, N. Hüsken ³⁶, N. in der Wiesche ⁷⁰, J. Jackson ²⁸, Q. Ji ¹, Q. P. Ji ²⁰, W. Ji ^1,65, X. B. Ji ^1,65, X. L. Ji ^1,59, Y. Y. Ji ⁵¹, Z. K. Jia ^59,73, D. Jiang ^1,65, H. B. Jiang ⁷⁸, P. C. Jiang ^47,c, S. J. Jiang ⁹, T. J. Jiang ¹⁷, X. S. Jiang ^1,59,65, Y. Jiang ⁶⁵, J. B. Jiao ⁵¹, J. K. Jiao ³⁵, Z. Jiao ²⁴, S. Jin ⁴³, Y. Jin ⁶⁸, M. Q. Jing ^1,65, X. M. Jing ⁶⁵, T. Johansson ⁷⁷, S. Kabana ³⁴, N. Kalantar-Nayestanaki⁶⁶, X. L. Kang ⁹, X. S. Kang ⁴¹, M. Kavatsyuk ⁶⁶, B. C. Ke ⁸², V. Khachatryan ²⁸, A. Khoukaz ⁷⁰, R. Kiuchi¹, O. B. Kolcu ^63a, B. Kopf ³, M. Kuessner ³, X. Kui ^1,65, N. Kumar ²⁷, A. Kupsc ^45,77, W. Kühn ³⁸, Q. Lan ⁷⁴, W. N. Lan ²⁰, T. T. Lei ^59,73, M. Lellmann ³⁶, T. Lenz ³⁶, C. Li ⁴⁸, C. Li ⁴⁴, C. H. Li ⁴⁰, C. K. Li ²¹, D. M. Li ⁸², F. Li ^1,59, G. Li ¹, H. B. Li ^1,65, H. J. Li ²⁰, H. N. Li ^57,i, Hui Li ⁴⁴, J. R. Li ⁶², J. S. Li ⁶⁰, K. Li ¹, K. L. Li ^20,39,d,e, L. J. Li ^1,65, Lei Li ⁴⁹, M. H. Li ⁴⁴, M. R. Li ^1,65, P. L. Li ⁶⁵, P. R. Li ^39,d,e, Q. M. Li ^1,65, Q. X. Li ⁵¹, R. Li ^18,32, S. X. Li ¹², T. Li ⁵¹, T. Y. Li ⁴⁴, W. D. Li ^1,65, W. G. Li ^1,b, X. Li ^1,65, X. H. Li ^59,73, X. L. Li ⁵¹, X. Y. Li ^1,8, X. Z. Li ⁶⁰, Y. Li ²⁰, Y. G. Li ^47,c, Y. P. Li ³⁵, Z. J. Li ⁶⁰, Z. Y. Li ⁸⁰, C. Liang ⁴³, H. Liang ^59,73, Y. F. Liang ⁵⁵, Y. T. Liang ^32,65, G. R. Liao ¹⁴, L. B. Liao ⁶⁰, M. H. Liao ⁶⁰, Y. P. Liao ^1,65, J. Libby ²⁷, A. Limphirat ⁶¹, C. C. Lin ⁵⁶, D. X. Lin ^32,65, L. Q. Lin ⁴⁰, T. Lin ¹, B. J. Liu ¹, B. X. Liu ⁷⁸, C. Liu ³⁵, C. X. Liu ¹, F. Liu ¹, F. H. Liu ⁵⁴, Feng Liu ⁶, G. M. Liu ^57,i, H. Liu ^39,d,e, H. B. Liu ¹⁵, H. H. Liu ¹, H. M. Liu ^1,65, Huihui Liu ²², J. B. Liu ^59,73, J. J. Liu ²¹, K. Liu ^39,d,e, K. Liu ⁷⁴, K. Y. Liu ⁴¹, Ke Liu ²³, L. C. Liu ⁴⁴, Lu Liu ⁴⁴, M. H. Liu ^12,35,f, P. L. Liu ¹, Q. Liu ⁶⁵, S. B. Liu ^59,73, T. Liu ^12,f, W. K. Liu ⁴⁴, W. M. Liu ^59,73, W. T. Liu ⁴⁰, X. Liu ^39,d,e, X. Liu ⁴⁰, X. K. Liu ^39,d,e, X. L. Liu ^12,f, X. Y. Liu ⁷⁸, Y. Liu ^39,d,e, Y. Liu ⁸², Yuan Liu ⁸², Y. B. Liu ⁴⁴, Z. A. Liu ^1,59,65, Z. D. Liu ⁹, Z. Q. Liu ⁵¹, X. C. Lou ^1,59,65, F. X. Lu ⁶⁰, H. J. Lu ²⁴, J. G. Lu ^1,59, X. L. Lu ¹⁶, Y. Lu ⁷, Y. H. Lu ^1,65, Y. P. Lu ^1,59, Z. H. Lu ^1,65, C. L. Luo ⁴², J. R. Luo ⁶⁰, J. S. Luo ^1,65, M. X. Luo⁸¹, T. Luo ^12,f, X. L. Luo ^1,59, Z. Y. Lv ²³, X. R. Lyu ^65,j, Y. F. Lyu ⁴⁴, Y. H. Lyu ⁸², F. C. Ma ⁴¹, H. L. Ma ¹, Heng Ma ^26,g, J. L. Ma ^1,65, L. L. Ma ⁵¹, L. R. Ma ⁶⁸, Q. M. Ma ¹, R. Q. Ma ^1,65, R. Y. Ma ²⁰, T. Ma ^59,73, X. T. Ma ^1,65, X. Y. Ma ^1,59, Y. M. Ma ³², F. E. Maas ¹⁹, I. MacKay ⁷¹, M. Maggiora ^76a,76c, S. Malde ⁷¹, Q. A. Malik ⁷⁵, H. X. Mao ^39,d,e, Y. J. Mao ^47,c, Z. P. Mao ¹, S. Marcello ^76a,76c, A. Marshall ⁶⁴, F. M. Melendi ^30a,30b, Y. H. Meng ⁶⁵, Z. X. Meng ⁶⁸, G. Mezzadri ^30a, H. Miao ^1,65, T. J. Min ⁴³, R. E. Mitchell ²⁸, X. H. Mo ^1,59,65, B. Moses ²⁸, N. Yu. Muchnoi ^4,a, J. Muskalla ³⁶, Y. Nefedov ³⁷, F. Nerling ^19,k, L. S. Nie ²¹, I. B. Nikolaev^4,a, Z. Ning ^1,59, S. Nisar^11,l, Q. L. Niu ^39,d,e, W. D. Niu ^12,f, C. Normand ⁶⁴, S. L. Olsen ^10,65, Q. Ouyang ^1,59,65, S. Pacetti ^29b,29c, X. Pan ⁵⁶, Y. Pan ⁵⁸, A. Pathak ¹⁰, Y. P. Pei ^59,73, M. Pelizaeus ³, H. P. Peng ^59,73, X. J. Peng ^39,d,e, Y. Y. Peng ^39,d,e, K. Peters ^13,k, K. Petridis ⁶⁴, J. L. Ping ⁴², R. G. Ping ^1,65, S. Plura ³⁶, V. Prasad ³⁵, F. Z. Qi ¹, H. R. Qi ⁶², M. Qi ⁴³, S. Qian ^1,59, W. B. Qian ⁶⁵, C. F. Qiao ⁶⁵, J. H. Qiao ²⁰, J. J. Qin ⁷⁴, J. L. Qin ⁵⁶, L. Q. Qin ¹⁴, L. Y. Qin ^59,73, P. B. Qin ⁷⁴, X. P. Qin ^12,f, X. S. Qin ⁵¹, Z. H. Qin ^1,59, J. F. Qiu ¹, Z. H. Qu ⁷⁴, J. Rademacker ⁶⁴, K. Ravindran ⁸³, C. F. Redmer ³⁶, A. Rivetti ^76c, M. Rolo ^76c, G. Rong ^1,65, S. S. Rong ^1,65, F. Rosini ^29b,29c, Ch. Rosner ¹⁹, M. Q. Ruan ^1,59, N. Salone ^45,m, A. Sarantsev ^37,n, Y. Schelhaas ³⁶, K. Schoenning ⁷⁷, M. Scodeggio ^30a, K. Y. Shan ^12,f, W. Shan ²⁵, X. Y. Shan ^59,73, Z. J. Shang ^39,d,e, J. F. Shangguan ¹⁷, L. G. Shao ^1,65, M. Shao ^59,73, C. P. Shen ^12,f, H. F. Shen ^1,8, W. H. Shen ⁶⁵, X. Y. Shen ^1,65, B. A. Shi ⁶⁵, H. Shi ^59,73, J. L. Shi ^12,f, J. Y. Shi ¹, S. Y. Shi ⁷⁴, X. Shi ^1,59, H. L. Song ^59,73, J. J. Song ²⁰, T. Z. Song ⁶⁰, W. M. Song ³⁵, Y. J. Song ^12,f, Y. X. Song ^47,o, Zirong Song ^26,g, S. Sosio ^76a,76c, S. Spataro ^76a,76c, S Stansilaus ⁷¹, F. Stieler ³⁶, S. S Su ⁴¹, Y. J. Su ⁶⁵, G. B. Sun ⁷⁸, G. X. Sun ¹, H. Sun ⁶⁵, H. K. Sun ¹, J. F. Sun ²⁰, K. Sun ⁶², L. Sun ⁷⁸, S. S. Sun ^1,65, T. Sun ^52,p, Y. C. Sun ⁷⁸, Y. H. Sun ³¹, Y. J. Sun ^59,73, Y. Z. Sun ¹, Z. Q. Sun ^1,65, Z. T. Sun ⁵¹, C. J. Tang⁵⁵, G. Y. Tang ¹, J. Tang ⁶⁰, J. J. Tang ^59,73, L. F. Tang ⁴⁰, Y. A. Tang ⁷⁸, L. Y. Tao ⁷⁴, M. Tat ⁷¹, J. X. Teng ^59,73, J. Y. Tian ^59,73, W. H. Tian ⁶⁰, Y. Tian ³², Z. F. Tian ⁷⁸, I. Uman ^63b, B. Wang ¹, B. Wang ⁶⁰, Bo Wang ^59,73, C. Wang ^39,d,e, C. Wang ²⁰, Cong Wang ²³, D. Y. Wang ^47,c, H. J. Wang ^39,d,e, J. J. Wang ⁷⁸, K. Wang ^1,59, L. L. Wang ¹, L. W. Wang ³⁵, M. Wang ⁵¹, M. Wang ^59,73, N. Y. Wang ⁶⁵, S. Wang ^12,f, T. Wang ^12,f, T. J. Wang ⁴⁴, W. Wang ⁶⁰, Wei Wang ⁷⁴, W. P. Wang ³⁶, X. Wang ^47,c, X. F. Wang ^39,d,e, X. J. Wang ⁴⁰, X. L. Wang ^12,f, X. N. Wang ^1,65, Y. Wang ⁶², Y. D. Wang ⁴⁶, Y. F. Wang ^1,65,8, Y. H. Wang ^39,d,e, Y. J. Wang ^59,73, Y. L. Wang ²⁰, Y. N. Wang ⁷⁸, Y. Q. Wang ¹, Yaqian Wang ¹⁸, Yuan Wang ^18,32, Z. Wang ^1,59, Z. L. Wang ^2,74, Z. Q. Wang ^12,f, Z. Y. Wang ^1,65, D. H. Wei ¹⁴, H. R. Wei ⁴⁴, F. Weidner ⁷⁰, S. P. Wen ¹, Y. R. Wen ⁴⁰, U. Wiedner ³, G. Wilkinson ⁷¹, M. Wolke⁷⁷, C. Wu ⁴⁰, J. F. Wu ^1,8, L. H. Wu ¹, L. J. Wu ^1,20,65, Lianjie Wu ²⁰, S. G. Wu ^1,65, S. M. Wu ⁶⁵, X. Wu ^12,f, X. H. Wu ³⁵, Y. J. Wu ³², Z. Wu ^1,59, L. Xia ^59,73, X. M. Xian ⁴⁰, B. H. Xiang ^1,65, D. Xiao ^39,d,e, G. Y. Xiao ⁴³, H. Xiao ⁷⁴, Y. L. Xiao ^12,f, Z. J. Xiao ⁴², C. Xie ⁴³, K. J. Xie ^1,65, X. H. Xie ^47,c, Y. Xie ⁵¹, Y. G. Xie ^1,59, Y. H. Xie ⁶, Z. P. Xie ^59,73, T. Y. Xing ^1,65, C. F. Xu^1,65, C. J. Xu ⁶⁰, G. F. Xu ¹, H. Y. Xu ^2,68, M. Xu ^59,73, Q. J. Xu ¹⁷, Q. N. Xu ³¹, T. D. Xu ⁷⁴, W. Xu ¹, W. L. Xu ⁶⁸, X. P. Xu ⁵⁶, Y. Xu ^12,41,f, Y. C. Xu ⁷⁹, Z. S. Xu ⁶⁵, F. Yan ^12,f, H. Y. Yan ⁴⁰, L. Yan ^12,f, W. B. Yan ^59,73, W. C. Yan ⁸², W. H. Yan ⁶, W. P. Yan ²⁰, X. Q. Yan ^1,65, H. J. Yang ^52,p, H. L. Yang ³⁵, H. X. Yang ¹, J. H. Yang ⁴³, R. J. Yang ²⁰, T. Yang ¹, Y. Yang ^12,f, Y. F. Yang ⁴⁴, Y. H. Yang ⁴³, Y. Q. Yang ⁹, Y. X. Yang ^1,65, Y. Z. Yang ²⁰, M. Ye ^1,59, M. H. Ye^8,b, Z. J. Ye ^57,i, Junhao Yin ⁴⁴, Z. Y. You ⁶⁰, B. X. Yu ^1,59,65, C. X. Yu ⁴⁴, G. Yu ¹³, J. S. Yu ^26,g, L. Q. Yu ^12,f, M. C. Yu ⁴¹, T. Yu ⁷⁴, X. D. Yu ^47,c, Y. C. Yu ⁸², C. Z. Yuan ^1,65, H. Yuan ^1,65, J. Yuan ³⁵, J. Yuan ⁴⁶, L. Yuan ², S. C. Yuan ^1,65, S. H. Yuan ⁷⁴, X. Q. Yuan ¹, Y. Yuan ^1,65, Z. Y. Yuan ⁶⁰, C. X. Yue ⁴⁰, Ying Yue ²⁰, A. A. Zafar ⁷⁵, S. H. Zeng ⁶⁴, X. Zeng ^12,f, Y. Zeng^26,g, Yujie Zeng ⁶⁰, Y. J. Zeng ^1,65, X. Y. Zhai ³⁵, Y. H. Zhan ⁶⁰, Shunan Zhang ⁷¹, A. Q. Zhang ^1,65, B. L. Zhang ^1,65, B. X. Zhang ¹, D. H. Zhang ⁴⁴, G. Y. Zhang ²⁰, G. Y. Zhang ^1,65, H. Zhang ^59,73, H. Zhang ⁸², H. C. Zhang ^1,59,65, H. H. Zhang ⁶⁰, H. Q. Zhang ^1,59,65, H. R. Zhang ^59,73, H. Y. Zhang ^1,59, Jin Zhang ⁸², J. Zhang ⁶⁰, J. J. Zhang ⁵³, J. L. Zhang ²¹, J. Q. Zhang ⁴², J. S. Zhang ^12,f, J. W. Zhang ^1,59,65, J. X. Zhang ^39,d,e, J. Y. Zhang ¹, J. Z. Zhang ^1,65, Jianyu Zhang ⁶⁵, L. M. Zhang ⁶², Lei Zhang ⁴³, N. Zhang ⁸², P. Zhang ^1,8, Q. Zhang ²⁰, Q. Y. Zhang ³⁵, R. Y. Zhang ^39,d,e, S. H. Zhang ^1,65, Shulei Zhang ^26,g, X. M. Zhang ¹, X. Y Zhang ⁴¹, X. Y. Zhang ⁵¹, Y. Zhang ¹, Y. Zhang ⁷⁴, Y. T. Zhang ⁸², Y. H. Zhang ^1,59, Y. M. Zhang ⁴⁰, Y. P. Zhang ^59,73, Z. D. Zhang ¹, Z. H. Zhang ¹, Z. L. Zhang ³⁵, Z. L. Zhang ⁵⁶, Z. X. Zhang ²⁰, Z. Y. Zhang ⁷⁸, Z. Y. Zhang ⁴⁴, Z. Z. Zhang ⁴⁶, Zh. Zh. Zhang ²⁰, G. Zhao ¹, J. Y. Zhao ^1,65, J. Z. Zhao ^1,59, L. Zhao ¹, L. Zhao ^59,73, M. G. Zhao ⁴⁴, N. Zhao ⁸⁰, R. P. Zhao ⁶⁵, S. J. Zhao ⁸², Y. B. Zhao ^1,59, Y. L. Zhao ⁵⁶, Y. X. Zhao ^32,65, Z. G. Zhao ^59,73, A. Zhemchugov ^37,h, B. Zheng ⁷⁴, B. M. Zheng ³⁵, J. P. Zheng ^1,59, W. J. Zheng ^1,65, X. R. Zheng ²⁰, Y. H. Zheng ^65,j, B. Zhong ⁴², C. Zhong ²⁰, H. Zhou ^36,51,q, J. Q. Zhou ³⁵, J. Y. Zhou ³⁵, S. Zhou ⁶, X. Zhou ⁷⁸, X. K. Zhou ⁶, X. R. Zhou ^59,73, X. Y. Zhou ⁴⁰, Y. X. Zhou ⁷⁹, Y. Z. Zhou ^12,f, A. N. Zhu ⁶⁵, J. Zhu ⁴⁴, K. Zhu ¹, K. J. Zhu ^1,59,65, K. S. Zhu ^12,f, L. Zhu ³⁵, L. X. Zhu ⁶⁵, S. H. Zhu ⁷², T. J. Zhu ^12,f, W. D. Zhu ^12,42,f, W. J. Zhu ¹, W. Z. Zhu ²⁰, Y. C. Zhu ^59,73, Z. A. Zhu ^1,65, X. Y. Zhuang ⁴⁴, J. H. Zou ¹, and J. Zu ^59,73 (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
⁸China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China
⁹China University of Geosciences, Wuhan 430074, People's Republic of China
¹⁰Chung-Ang University, Seoul, 06974, Republic of Korea
¹¹COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
¹²Fudan University, Shanghai 200433, People's Republic of China
¹³GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
¹⁴Guangxi Normal University, Guilin 541004, People's Republic of China
¹⁵Guangxi University, Nanning 530004, People's Republic of China
¹⁶Guangxi University of Science and Technology, Liuzhou 545006, People's Republic of China
¹⁷Hangzhou Normal University, Hangzhou 310036, People's Republic of China
¹⁸Hebei University, Baoding 071002, People's Republic of China
¹⁹Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
²⁰Henan Normal University, Xinxiang 453007, People's Republic of China
²¹Henan University, Kaifeng 475004, People's Republic of China
²²Henan University of Science and Technology, Luoyang 471003, People's Republic of China
²³Henan University of Technology, Zhengzhou 450001, People's Republic of China
²⁴Huangshan College, Huangshan 245000, People's Republic of China
²⁵Hunan Normal University, Changsha 410081, People's Republic of China
²⁶Hunan University, Changsha 410082, People's Republic of China
²⁷Indian Institute of Technology Madras, Chennai 600036, India
²⁸Indiana University, Bloomington, Indiana 47405, USA
^29aINFN Laboratori Nazionali di Frascati, INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy;
^29bINFN Laboratori Nazionali di Frascati, INFN Sezione di Perugia, I-06100 Perugia, Italy;
^29cINFN Laboratori Nazionali di Frascati, University of Perugia, I-06100 Perugia, Italy
^30aINFN Sezione di Ferrara, INFN Sezione di Ferrara, I-44122 Ferrara, Italy;
^30bINFN Sezione di Ferrara, University of Ferrara, I-44122 Ferrara, Italy
³¹Inner Mongolia University, Hohhot 010021, People's Republic of China
³²Institute of Modern Physics, Lanzhou 730000, People's Republic of China
³³Institute of Physics and Technology, Mongolian Academy of Sciences, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
³⁴Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica 1000000, Chile
³⁵Jilin University, Changchun 130012, People's Republic of China
³⁶Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
³⁷Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
³⁸Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
³⁹Lanzhou University, Lanzhou 730000, People's Republic of China
⁴⁰Liaoning Normal University, Dalian 116029, People's Republic of China
⁴¹Liaoning University, Shenyang 110036, People's Republic of China
⁴²Nanjing Normal University, Nanjing 210023, People's Republic of China
⁴³Nanjing University, Nanjing 210093, People's Republic of China
⁴⁴Nankai University, Tianjin 300071, People's Republic of China
⁴⁵National Centre for Nuclear Research, Warsaw 02-093, Poland
⁴⁶North China Electric Power University, Beijing 102206, People's Republic of China
⁴⁷Peking University, Beijing 100871, People's Republic of China
⁴⁸Qufu Normal University, Qufu 273165, People's Republic of China
⁴⁹Renmin University of China, Beijing 100872, People's Republic of China
⁵⁰Shandong Normal University, Jinan 250014, People's Republic of China
⁵¹Shandong University, Jinan 250100, People's Republic of China
⁵²Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
⁵³Shanxi Normal University, Linfen 041004, People's Republic of China
⁵⁴Shanxi University, Taiyuan 030006, People's Republic of China
⁵⁵Sichuan University, Chengdu 610064, People's Republic of China
⁵⁶Soochow University, Suzhou 215006, People's Republic of China
⁵⁷South China Normal University, Guangzhou 510006, People's Republic of China
⁵⁸Southeast University, Nanjing 211100, People's Republic of China
⁵⁹State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People's Republic of China
⁶⁰Sun Yat-Sen University, Guangzhou 510275, People's Republic of China
⁶¹Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁶²Tsinghua University, Beijing 100084, People's Republic of China
^63aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010 Istanbul, Turkey;
^63bTurkish Accelerator Center Particle Factory Group, Near East University, Nicosia, North Cyprus, 99138 Mersin 10, Turkey
⁶⁴University of Bristol, H H Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
⁶⁵University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
⁶⁶University of Groningen, NL-9747 AA Groningen, The Netherlands
⁶⁷University of Hawaii, Honolulu, Hawaii 96822, USA
⁶⁸University of Jinan, Jinan 250022, People's Republic of China
⁶⁹University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
⁷⁰University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany
⁷¹University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
⁷²University of Science and Technology Liaoning, Anshan 114051, People's Republic of China
⁷³University of Science and Technology of China, Hefei 230026, People's Republic of China
⁷⁴University of South China, Hengyang 421001, People's Republic of China
⁷⁵University of the Punjab, Lahore-54590, Pakistan
^76aUniversity of Turin and INFN, University of Turin, I-10125 Turin, Italy;
^76bUniversity of Turin and INFN, University of Eastern Piedmont, I-15121 Alessandria, Italy;
^76cUniversity of Turin and INFN, INFN, I-10125 Turin, Italy
⁷⁷Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁷⁸Wuhan University, Wuhan 430072, People's Republic of China
⁷⁹Yantai University, Yantai 264005, People's Republic of China
⁸⁰Yunnan University, Kunming 650500, People's Republic of China
⁸¹Zhejiang University, Hangzhou 310027, People's Republic of China
⁸²Zhengzhou University, Zhengzhou 450001, People's Republic of China
⁸³University of La Serena, Av. Raúl Bitrán 1305, La Serena, Chile

^aAlso at the Novosibirsk State University, Novosibirsk 630090, Russia.
^bDeceased.
^cAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China.
^dAlso at MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People's Republic of China.
^eAlso at Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People's Republic of China.
^fAlso 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.
^gAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
^hAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
ⁱAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
^jAlso at Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.
^kAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^lAlso at the Department of Mathematical Sciences, IBA, Karachi 75270, Pakistan.
^mAlso at Silesian University in Katowice, Chorzow 41-500, Poland.
ⁿAlso at the NRC “Kurchatov Institute”, PNPI, 188300 Gatchina, Russia.
^oAlso at Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
^pAlso 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.
^qAlso at Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany.

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Phys. Rev. C 113, L062202 – Published 29 June, 2026

DOI: https://doi.org/10.1103/yl6l-ldhn

Abstract

Using $(10087 \pm 44) \times 10^{6} J / ψ$ events collected with the BESIII detector operating at the BEPCII storage ring in 2009, 2012, 2018, and 2019, we perform a search for the reaction $Ξ^{0} n \to Λ Λ X$ , where $X$ denotes any additional final particles. Given the highly suppressed phase space for producing extra pions, the $X$ consists of either nothing or a photon, corresponding to the processes $Ξ^{0} n \to Λ Λ$ and $Ξ^{0} n \to Λ Σ^{0} \to Λ Λ γ$ . The $Ξ^{0}$ comes from the decay of $J / ψ \to Ξ^{0} {\bar{Ξ}}^{0}$ , while the neutron originates from material of the beam pipe. A signal is observed for the first time with a statistical significance of $6.4 σ$ . The cross section for the reaction $Ξ^{0} + {}^{9}{Be} \to Λ + Λ + X$ is measured to be $(43.6 \pm 10 . 5_{stat} \pm 11 . 1_{syst}) mb$ at $P_{Ξ^{0}} \approx 0.818 GeV / c$ , where the first uncertainty is statistical and the second systematic. No significant $H$ -dibaryon signal is observed in the $Λ Λ$ final state.

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Phys. Rev. C 113, L062202– Published 29 June, 2026

Vol. 113, Iss. 6 — June 2026

Received 4 December 2025
Accepted 10 February 2026

DOI: https://doi.org/10.1103/yl6l-ldhn

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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Experimental study of the reaction $Ξ^{0} n \to Λ Λ X$ using $Ξ^{0}$ -nucleus scattering

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Experimental study of the reaction Ξ0n→ΛΛX using Ξ0-nucleus scattering

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References (71)

Experimental study of the reaction $Ξ^{0} n \to Λ Λ X$ using $Ξ^{0}$ -nucleus scattering