Letter
Open Access

First simultaneous measurement of $Ξ^{0}$ and ${\bar{Ξ}}^{0}$ asymmetry parameters in $ψ (3686)$ decay

M. Ablikim¹, M. N. Achasov^13,b, P. Adlarson⁷³, R. Aliberti³⁴, A. Amoroso^72a,72c, M. R. An³⁸, Q. An^69,56, Y. Bai⁵⁵, O. Bakina³⁵ et al. (BESIII Collaboration)

O. Bakina³⁵, I. Balossino^29a, Y. Ban^45,g, V. Batozskaya^1,43, K. Begzsuren³¹, N. Berger³⁴, M. Bertani^28a, D. Bettoni^29a, F. Bianchi^72a,72c, E. Bianco^72a,72c, J. Bloms⁶⁶, A. Bortone^72a,72c, I. Boyko³⁵, R. A. Briere⁵, A. Brueggemann⁶⁶, H. Cai⁷⁴, X. Cai^1,56, A. Calcaterra^28a, G. F. Cao^1,61, N. Cao^1,61, S. A. Cetin^60a, J. F. Chang^1,56, T. T. Chang⁷⁵, W. L. Chang^1,61, G. R. Che⁴², G. Chelkov^35,a, C. Chen⁴², Chao Chen⁵³, G. Chen¹, H. S. Chen^1,61, M. L. Chen^1,56,61, S. J. Chen⁴¹, S. M. Chen⁵⁹, T. Chen^1,61, X. R. Chen^30,61, X. T. Chen^1,61, Y. B. Chen^1,56, Y. Q. Chen³³, Z. J. Chen^25,h, W. S. Cheng^72c, S. K. Choi¹⁰, X. Chu⁴², G. Cibinetto^29a, S. C. Coen⁴, F. Cossio^72c, J. J. Cui⁴⁸, H. L. Dai^1,56, J. P. Dai⁷⁷, A. Dbeyssi¹⁹, R. E. de Boer⁴, D. Dedovich³⁵, Z. Y. Deng¹, A. Denig³⁴, I. Denysenko³⁵, M. Destefanis^72a,72c, F. De Mori^72a,72c, B. Ding^64,1, X. X. Ding^45,g, Y. Ding³³, Y. Ding³⁹, J. Dong^1,56, L. Y. Dong^1,61, M. Y. Dong^1,56,61, X. Dong⁷⁴, S. X. Du⁷⁹, Z. H. Duan⁴¹, P. Egorov^35,a, Y. L. Fan⁷⁴, J. Fang^1,56, S. S. Fang^1,61, W. X. Fang¹, Y. Fang¹, R. Farinelli^29a, L. Fava^72b,72c, F. Feldbauer⁴, G. Felici^28a, C. Q. Feng^69,56, J. H. Feng⁵⁷, K. Fischer⁶⁷, M. Fritsch⁴, C. Fritzsch⁶⁶, C. D. Fu¹, Y. W. Fu¹, H. Gao⁶¹, Y. N. Gao^45,g, Yang Gao^69,56, S. Garbolino^72c, I. Garzia^29a,29b, P. T. Ge⁷⁴, Z. W. Ge⁴¹, C. Geng⁵⁷, E. M. Gersabeck⁶⁵, A. Gilman⁶⁷, K. Goetzen¹⁴, L. Gong³⁹, W. X. Gong^1,56, W. Gradl³⁴, S. Gramigna^29a,29b, M. Greco^72a,72c, M. H. Gu^1,56, Y. T. Gu¹⁶, C. Y. Guan^1,61, Z. L. Guan²², A. Q. Guo^30,61, L. B. Guo⁴⁰, R. P. Guo⁴⁷, Y. P. Guo^12,f, A. Guskov^35,a, X. T. Hou^1,61, W. Y. Han³⁸, F. A. Harris⁶³, K. K. He⁵³, K. L. He^1,61, F. H. Heinsius⁴, C. H. Heinz³⁴, Y. K. Heng^1,56,61, C. Herold⁵⁸, T. Holtmann⁴, P. C. Hong^12,f, G. Y. Hou^1,61, Y. R. Hou⁶¹, X. Q. Hao²⁰, Z. L. Hou¹, H. M. Hu^1,61, J. F. Hu^54,i, T. Hu^1,56,61, Y. Hu¹, G. S. Huang^69,56, K. X. Huang⁵⁷, L. Q. Huang^30,61, X. T. Huang⁴⁸, Y. P. Huang¹, T. Hussain⁷¹, N. Hüsken^27,34, W. Imoehl²⁷, M. Irshad^69,56, J. Jackson²⁷, S. Jaeger⁴, S. Janchiv³¹, J. H. Jeong¹⁰, Q. Ji¹, Q. P. Ji²⁰, X. B. Ji^1,61, X. L. Ji^1,56, Y. Y. Ji⁴⁸, Z. K. Jia^69,56, P. C. Jiang^45,g, S. S. Jiang³⁸, T. J. Jiang¹⁷, X. S. Jiang^1,56,61, Y. Jiang⁶¹, J. B. Jiao⁴⁸, Z. Jiao²³, S. Jin⁴¹, Y. Jin⁶⁴, M. Q. Jing^1,61, T. Johansson⁷³, S. Kabana³², N. Kalantar-Nayestanaki⁶², X. L. Kang⁹, X. S. Kang³⁹, R. Kappert⁶², M. Kavatsyuk⁶², B. C. Ke⁷⁹, A. Khoukaz⁶⁶, R. Kiuchi¹, R. Kliemt¹⁴, L. Koch³⁶, O. B. Kolcu^60a, B. Kopf⁴, M. Kuessner⁴, X. Kui¹, A. Kupsc^43,73, W. Kühn³⁶, J. J. Lane⁶⁵, J. S. Lange³⁶, P. Larin¹⁹, A. Lavania²⁶, L. Lavezzi^72a,72c, T. T. Lei^69,k, Z. H. Lei^69,56, H. Leithoff³⁴, M. Lellmann³⁴, T. Lenz³⁴, C. Li⁴², C. Li⁴⁶, C. H. Li³⁸, Cheng Li^69,56, D. M. Li⁷⁹, F. Li^1,56, G. Li¹, H. Li^69,56, H. B. Li^1,61, H. J. Li²⁰, H. N. Li^54,i, Hui Li⁴², J. R. Li⁵⁹, J. S. Li⁵⁷, J. W. Li⁴⁸, Ke Li¹, L. J. Li^1,61, L. K. Li¹, Lei Li³, M. H. Li⁴², P. R. Li^37,j,k, S. X. Li¹², T. Li⁴⁸, W. D. Li^1,61, W. G. Li¹, X. H. Li^69,56, X. L. Li⁴⁸, Xiaoyu Li^1,61, Y. G. Li^45,g, Z. J. Li⁵⁷, Z. X. Li¹⁶, Z. Y. Li⁵⁷, C. Liang⁴¹, H. Liang^69,56, H. Liang^1,61, H. Liang³³, Y. F. Liang⁵², Y. T. Liang^30,61, G. R. Liao¹⁵, L. Z. Liao⁴⁸, J. Libby²⁶, A. Limphirat⁵⁸, D. X. Lin^30,61, T. Lin¹, B. J. Liu¹, B. X. Liu⁷⁴, C. Liu³³, C. X. Liu¹, D. Liu^19,69, F. H. Liu⁵¹, Fang Liu¹, Feng Liu⁶, G. M. Liu^54,i, H. Liu^37,j,k, H. B. Liu¹⁶, H. M. Liu^1,61, Huanhuan Liu¹, Huihui Liu²¹, J. B. Liu^69,56, J. L. Liu⁷⁰, J. Y. Liu^1,61, K. Liu¹, K. Y. Liu³⁹, Ke Liu²², L. Liu^69,56, L. C. Liu⁴², Lu Liu⁴², M. H. Liu^12,f, P. L. Liu¹, Q. Liu⁶¹, S. B. Liu^69,56, T. Liu^12,f, W. K. Liu⁴², W. M. Liu^69,56, X. Liu^37,j,k, Y. Liu^37,j,k, Y. B. Liu⁴², Z. A. Liu^1,56,61, Z. Q. Liu⁴⁸, X. C. Lou^1,56,61, F. X. Lu⁵⁷, H. J. Lu²³, J. G. Lu^1,56, X. L. Lu¹, Y. Lu⁷, Y. P. Lu^1,56, Z. H. Lu^1,61, C. L. Luo⁴⁰, M. X. Luo⁷⁸, T. Luo^12,f, X. L. Luo^1,56, X. R. Lyu⁶¹, Y. F. Lyu⁴², F. C. Ma³⁹, H. L. Ma¹, J. L. Ma^1,61, L. L. Ma⁴⁸, M. M. Ma^1,61, Q. M. Ma¹, R. Q. Ma^1,61, R. T. Ma⁶¹, X. Y. Ma^1,56, Y. Ma^45,g, F. E. Maas¹⁹, M. Maggiora^72a,72c, S. Maldaner⁴, S. Malde⁶⁷, A. Mangoni^28b, Y. J. Mao^45,g, Z. P. Mao¹, S. Marcello^72a,72c, Z. X. Meng⁶⁴, J. G. Messchendorp^14,62, G. Mezzadri^29a, H. Miao^1,61, T. J. Min⁴¹, R. E. Mitchell²⁷, X. H. Mo^1,56,61, N. Yu. Muchnoi^13,b, Y. Nefedov³⁵, F. Nerling^19,d, I. B. Nikolaev^13,b, Z. Ning^1,56, S. Nisar^11,l, Y. Niu⁴⁸, S. L. Olsen⁶¹, Q. Ouyang^1,56,61, S. Pacetti^28b,28c, X. Pan⁵³, Y. Pan⁵⁵, A. Pathak³³, Y. P. Pei^69,56, M. Pelizaeus⁴, H. P. Peng^69,56, K. Peters^14,d, J. L. Ping⁴⁰, R. G. Ping^1,61, S. Plura³⁴, S. Pogodin³⁵, V. Prasad³², F. Z. Qi¹, H. Qi^69,56, H. R. Qi⁵⁹, M. Qi⁴¹, T. Y. Qi^12,f, S. Qian^1,56, W. B. Qian⁶¹, C. F. Qiao⁶¹, J. J. Qin⁷⁰, L. Q. Qin¹⁵, X. P. Qin^12,f, X. S. Qin⁴⁸, Z. H. Qin^1,56, J. F. Qiu¹, S. Q. Qu⁵⁹, C. F. Redmer³⁴, K. J. Ren³⁸, A. Rivetti^72c, V. Rodin⁶², M. Rolo^72c, G. Rong^1,61, Ch. Rosner¹⁹, S. N. Ruan⁴², N. Salone⁴³, A. Sarantsev^35,c, Y. Schelhaas³⁴, K. Schoenning⁷³, M. Scodeggio^29a,29b, K. Y. Shan^12,f, W. Shan²⁴, X. Y. Shan^69,56, J. F. Shangguan⁵³, L. G. Shao^1,61, M. Shao^69,56, C. P. Shen^12,f, H. F. Shen^1,61, W. H. Shen⁶¹, X. Y. Shen^1,61, B. A. Shi⁶¹, H. C. Shi^69,56, J. L. Shi¹², J. Y. Shi¹, Q. Q. Shi⁵³, R. S. Shi^1,61, X. Shi^1,56, J. J. Song²⁰, T. Z. Song⁵⁷, W. M. Song^33,1, Y. J. Song¹², Y. X. Song^45,g, S. Sosio^72a,72c, S. Spataro^72a,72c, F. Stieler³⁴, Y. J. Su⁶¹, G. B. Sun⁷⁴, G. X. Sun¹, H. Sun⁶¹, H. K. Sun¹, J. F. Sun²⁰, K. Sun⁵⁹, L. Sun⁷⁴, S. S. Sun^1,61, T. Sun^1,61, W. Y. Sun³³, Y. Sun⁹, Y. J. Sun^69,56, Y. Z. Sun¹, Z. T. Sun⁴⁸, Y. X. Tan^69,56, C. J. Tang⁵², G. Y. Tang¹, J. Tang⁵⁷, Y. A. Tang⁷⁴, L. Y. Tao⁷⁰, Q. T. Tao^25,h, M. Tat⁶⁷, J. X. Teng^69,56, V. Thoren⁷³, W. H. Tian⁵⁷, W. H. Tian⁵⁰, Y. Tian^30,61, Z. F. Tian⁷⁴, I. Uman^60b, B. Wang¹, B. L. Wang⁶¹, Bo Wang^69,56, C. W. Wang⁴¹, D. Y. Wang^45,g, F. Wang⁷⁰, H. J. Wang^37,j,k, H. P. Wang^1,61, K. Wang^1,56, L. L. Wang¹, M. Wang⁴⁸, Meng Wang^1,61, S. Wang^12,f, S. Wang^37,j,k, T. Wang^12,f, T. J. Wang⁴², W. Wang⁷⁰, W. Wang⁵⁷, W. H. Wang⁷⁴, W. P. Wang^69,56, X. Wang^45,g, X. F. Wang^37,j,k, X. J. Wang³⁸, X. L. Wang^12,f, Y. Wang⁵⁹, Y. D. Wang⁴⁴, Y. F. Wang^1,56,61, Y. H. Wang⁴⁶, Y. N. Wang⁴⁴, Y. Q. Wang¹, Yaqian Wang^18,1, Yi Wang⁵⁹, Z. Wang^1,56, Z. L. Wang⁷⁰, Z. Y. Wang^1,61, Ziyi Wang⁶¹, D. Wei⁶⁸, D. H. Wei¹⁵, F. Weidner⁶⁶, S. P. Wen¹, C. W. Wenzel⁴, U. Wiedner⁴, G. Wilkinson⁶⁷, M. Wolke⁷³, L. Wollenberg⁴, C. Wu³⁸, J. F. Wu^1,61, L. H. Wu¹, L. J. Wu^1,61, X. Wu^12,f, X. H. Wu³³, Y. Wu⁶⁹, Y. J. Wu³⁰, Z. Wu^1,56, L. Xia^69,56, X. M. Xian³⁸, T. Xiang^45,g, D. Xiao^37,j,k, G. Y. Xiao⁴¹, H. Xiao^12,f, S. Y. Xiao¹, Y. L. Xiao^12,f, Z. J. Xiao⁴⁰, C. Xie⁴¹, X. H. Xie^45,g, Y. Xie⁴⁸, Y. G. Xie^1,56, Y. H. Xie⁶, Z. P. Xie^69,56, T. Y. Xing^1,61, C. F. Xu^1,61, C. J. Xu⁵⁷, G. F. Xu¹, H. Y. Xu⁶⁴, Q. J. Xu¹⁷, W. L. Xu⁶⁴, X. P. Xu⁵³, Y. C. Xu⁷⁶, Z. P. Xu⁴¹, F. Yan^12,f, L. Yan^12,f, W. B. Yan^69,56, W. C. Yan⁷⁹, X. Q. Yan¹, H. J. Yang^49,e, H. L. Yang³³, H. X. Yang¹, Tao Yang¹, Y. Yang^12,f, Y. F. Yang⁴², Y. X. Yang^1,61, Yifan Yang^1,61, Z. W. Yang^37,j,k, M. Ye^1,56, M. H. Ye⁸, J. H. Yin¹, Z. Y. You⁵⁷, B. X. Yu^1,56,61, C. X. Yu⁴², G. Yu^1,61, T. Yu⁷⁰, X. D. Yu^45,g, C. Z. Yuan^1,61, L. Yuan², S. C. Yuan¹, X. Q. Yuan¹, Y. Yuan^1,61, Z. Y. Yuan⁵⁷, C. X. Yue³⁸, A. A. Zafar⁷¹, F. R. Zeng⁴⁸, X. Zeng^12,f, Y. Zeng^25,h, Y. J. Zeng^1,61, X. Y. Zhai³³, Y. H. Zhan⁵⁷, A. Q. Zhang^1,61, B. L. Zhang^1,61, B. X. Zhang¹, D. H. Zhang⁴², G. Y. Zhang²⁰, H. Zhang⁶⁹, H. H. Zhang⁵⁷, H. H. Zhang³³, H. Q. Zhang^1,56,61, H. Y. Zhang^1,56, J. J. Zhang⁵⁰, J. L. Zhang⁷⁵, J. Q. Zhang⁴⁰, J. W. Zhang^1,56,61, J. X. Zhang^37,j,k, J. Y. Zhang¹, J. Z. Zhang^1,61, Jiawei Zhang^1,61, L. M. Zhang⁵⁹, L. Q. Zhang⁵⁷, Lei Zhang⁴¹, P. Zhang¹, Q. Y. Zhang^38,79, Shuihan Zhang^1,61, Shulei Zhang^25,h, X. D. Zhang⁴⁴, X. M. Zhang¹, X. Y. Zhang⁵³, X. Y. Zhang⁴⁸, Y. Zhang⁶⁷, Y. T. Zhang⁷⁹, Y. H. Zhang^1,56, Yan Zhang^69,56, Yao Zhang¹, Z. H. Zhang¹, Z. L. Zhang³³, Z. Y. Zhang⁷⁴, Z. Y. Zhang⁴², G. Zhao¹, J. Zhao³⁸, J. Y. Zhao^1,61, J. Z. Zhao^1,56, Lei Zhao^69,56, Ling Zhao¹, M. G. Zhao⁴², S. J. Zhao⁷⁹, Y. B. Zhao^1,56, Y. X. Zhao^30,61, Z. G. Zhao^69,56, A. Zhemchugov^35,a, B. Zheng⁷⁰, J. P. Zheng^1,56, W. J. Zheng^1,61, Y. H. Zheng⁶¹, B. Zhong⁴⁰, X. Zhong⁵⁷, H. Zhou⁴⁸, L. P. Zhou^1,61, X. Zhou⁷⁴, X. K. Zhou⁶, X. R. Zhou^69,56, X. Y. Zhou³⁸, Y. Z. Zhou^12,f, J. Zhu⁴², K. Zhu¹, K. J. Zhu^1,56,61, L. Zhu³³, L. X. Zhu⁶¹, S. H. Zhu⁶⁸, S. Q. Zhu⁴¹, T. J. Zhu^12,f, W. J. Zhu^12,f, Y. C. Zhu^69,56, Z. A. Zhu^1,61, J. H. Zou¹, and J. Zu^69,56 (BESIII Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People’s Republic of China
²Beihang University, Beijing 100191, People’s Republic of China
³Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China
⁴Bochum Ruhr-University, D-44780 Bochum, Germany
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
¹³G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
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
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 of Science and Technology, Luoyang 471003, People’s Republic of China
²²Henan University of Technology, Zhengzhou 450001, People’s Republic of China
²³Huangshan College, Huangshan 245000, People’s Republic of China
²⁴Hunan Normal University, Changsha 410081, People’s Republic of China
²⁵Hunan University, Changsha 410082, People’s Republic of China
²⁶Indian Institute of Technology Madras, Chennai 600036, India
²⁷Indiana University, Bloomington, Indiana 47405, USA
^28aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy;
^28bINFN Sezione di Perugia, I-06100, Perugia, Italy;
^28cUniversity of Perugia, I-06100, Perugia, Italy
^29aINFN Sezione di Ferrara, I-44122, Ferrara, Italy;
^29bUniversity of Ferrara, I-44122, Ferrara, Italy
³⁰Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
³¹Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
³²Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile
³³Jilin University, Changchun 130012, People’s Republic of China
³⁴Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
³⁵Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
³⁶Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
³⁷Lanzhou University, Lanzhou 730000, People’s Republic of China
³⁸Liaoning Normal University, Dalian 116029, People’s Republic of China
³⁹Liaoning University, Shenyang 110036, People’s Republic of China
⁴⁰Nanjing Normal University, Nanjing 210023, People’s Republic of China
⁴¹Nanjing University, Nanjing 210093, People’s Republic of China
⁴²Nankai University, Tianjin 300071, People’s Republic of China
⁴³National Centre for Nuclear Research, Warsaw 02-093, Poland
⁴⁴North China Electric Power University, Beijing 102206, People’s Republic of China
⁴⁵Peking University, Beijing 100871, People’s Republic of China
⁴⁶Qufu Normal University, Qufu 273165, People’s Republic of China
⁴⁷Shandong Normal University, Jinan 250014, People’s Republic of China
⁴⁸Shandong University, Jinan 250100, People’s Republic of China
⁴⁹Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁵⁰Shanxi Normal University, Linfen 041004, People’s Republic of China
⁵¹Shanxi University, Taiyuan 030006, People’s Republic of China
⁵²Sichuan University, Chengdu 610064, People’s Republic of China
⁵³Soochow University, Suzhou 215006, People’s Republic of China
⁵⁴South China Normal University, Guangzhou 510006, People’s Republic of China
⁵⁵Southeast University, Nanjing 211100, People’s Republic of China
⁵⁶State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁵⁷Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁵⁸Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁵⁹Tsinghua University, Beijing 100084, People’s Republic of China
^60aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey;
^60bNear East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey
⁶¹University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁶²University of Groningen, NL-9747 AA Groningen, Netherlands
⁶³University of Hawaii, Honolulu, Hawaii 96822, USA
⁶⁴University of Jinan, Jinan 250022, People’s Republic of China
⁶⁵University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
⁶⁶University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany
⁶⁷University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
⁶⁸University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁶⁹University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁷⁰University of South China, Hengyang 421001, People’s Republic of China
⁷¹University of the Punjab, Lahore-54590, Pakistan
^72aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy;
^72bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy;
^72cINFN, I-10125, Turin, Italy
⁷³Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁷⁴Wuhan University, Wuhan 430072, People’s Republic of China
⁷⁵Xinyang Normal University, Xinyang 464000, People’s Republic of China
⁷⁶Yantai University, Yantai 264005, People’s Republic of China
⁷⁷Yunnan University, Kunming 650500, People’s Republic of China
⁷⁸Zhejiang University, Hangzhou 310027, People’s Republic of China
⁷⁹Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^aAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^bAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
^cAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
^dAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^eAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; and Institute of Nuclear and Particle Physics, Shanghai 200240, 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 State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
^hAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
ⁱAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
^jAlso at Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^kAlso at Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, and Key Laboratory for Quantum Theory and Applications of the the MoE, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^lAlso at the Department of Mathematical Sciences, IBA, Karachi, Pakistan.

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Phys. Rev. D 108, L011101 – Published 7 July, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L011101

Abstract

The $Ξ^{0}$ asymmetry parameters are measured using entangled quantum $Ξ^{0} - {\bar{Ξ}}^{0}$ pairs from a sample of $(448.1 \pm 2.9) \times 10^{6} ψ (3686)$ events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the $Ξ^{0} {\bar{Ξ}}^{0}$ helicity states is measured to be $Δ Φ = - 0.050 \pm 0.150 \pm 0.020 rad$ , which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the $Ξ^{0}$ hyperon $(α_{Ξ^{0}}, α_{{\bar{Ξ}}^{0}}, ϕ_{Ξ^{0}}, ϕ_{{\bar{Ξ}}^{0}})$ and the angular distribution parameter $[α_{ψ (3686)}]$ and $Δ Φ$ are measured simultaneously for the first time. In addition, the $C P$ asymmetry observables are determined to be $A_{C P}^{Ξ^{0}} = (α_{Ξ^{0}} + α_{{\bar{Ξ}}^{0}}) / (α_{Ξ^{0}} - α_{{\bar{Ξ}}^{0}}) = - 0.007 \pm 0.082 \pm 0.025$ and $Δ ϕ_{C P}^{Ξ^{0}} = (ϕ_{Ξ^{0}} + ϕ_{{\bar{Ξ}}^{0}}) / 2 = - 0.079 \pm 0.082 \pm 0.010 rad$ , which are consistent with $C P$ conservation.

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References (49)

A. D. Sakharov, Pis’ma Zh. Eksp. Teor. Fiz. 5, 32 (1967).
J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, Phys. Rev. Lett. 13, 138 (1964).
B. Aubert et al. (BABAR Collaboration), Phys. Rev. Lett. 87, 091801 (2001).
K. Abe et al. (Belle Collaboration), Phys. Rev. Lett. 87, 091802 (2001).
R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett. 122, 211803 (2019).
K. Abe et al. (T2K Collaboration), Nature (London) 580, 339 (2020).
X. G. He, J. Tandean, and G. Valencia, Sci. Bull. 67, 1840 (2022).
J. F. Donoghue, X. G. He, and S. Pakvasa, Phys. Rev. D 34, 833 (1986).
D. G. Ireland, M. Döring, D. I. Glazier, J. Haidenbauer, M. Mai, R. Murray-Smith, and D. Rönchen, Phys. Rev. Lett. 123, 182301 (2019).
H. Liu, J. Zhang, and X. Wang, Symmetry 15, 214 (2023).
BESIII Collaboration, Nat. Phys. 15, 631 (2019).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 105, L011101 (2022).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. Lett. 129, 131801 (2022).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. Lett. 125. 052004 (2020).
M. Ablikim et al. (BESIII Collaboration), Nature (London) 606, 64 (2022).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 106, L091101 (2022).
R. Handler et al., Phys. Rev. D 25, 639 (1982).
J. R. Batley et al. (NA48/1 Collaboration), Phys. Lett. B 693, 241 (2010).
J. P. Berge, P. Eberhard, J. R. Hubbard, D. W. Merrill, J. Button-Shafer, F. T. Solmitz, and M. L. Stevenson, Phys. Rev. 147, 945 (1966).
P. M. Dauber, J. P. Berge, J. R. Hubbard, D. W. Merrill, and R. A. Muller, Phys. Rev. 179, 1262 (1969).
C. Baltay, A. Bridgewater, W. A. Cooper, L. K. Gershwin, M. Habibi, M. Kalelkar, N. Yeh, and A. Gaigalas, Phys. Rev. D 9, 49 (1974).
T. D. Lee and C. N. Yang, Phys. Rev. 108, 1645 (1957).
E. Perotti, G. Fäldt, A. Kupsc, S. Leupold, and J. J. Song, Phys. Rev. D 99, 056008 (2019).
G. Fäldt and A. Kupsc, Phys. Lett. B 772, 16 (2017).
M. Ablikim et al. (BESIII Collaboration), Chin. Phys. C 42, 023001 (2018).
M. Ablikim et al. (BESIII Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 614, 345 (2010).
X. Zhou, S. Du, G. Li, and C. Shen, Comput. Phys. Commun. 258, 107540 (2021).
S. Jadach, B. F. L. Ward, and Z. Was, Comput. Phys. Commun. 130, 260 (2000).
S. Jadach, B. F. L. Ward, and Z. Was, Phys. Rev. D 63, 113009 (2001).
D. J. Lange, Nucl. Instrum. Methods Phys. Res., Sect. A 462, 152 (2001).
R. G. Ping, Chin. Phys. C 32, 599 (2008).
R. L. Workma et al. (Particle Data Group), Prog. Theor. Exp. Phys. 2022, 083C01 (2022).
J. C. Chen, G. S. Huang, X. R. Qi, D. H. Zhang, and Y. S. Zhu, Phys. Rev. D 62, 034003 (2000).
R. L. Yang, R. G. Ping, and H. Chen, Chin. Phys. Lett. 31, 061301 (2014).
S. Agostinelli et al. (GEANT4 Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 506, 250 (2003).
J. Allison et al., IEEE Trans. Nucl. Sci. 53, 270 (2006).
M. Ablikim et al. (BESIII Collaboration), Phys. Lett. B 770, 217 (2017).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 93, 072003 (2016).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 100, 051101 (2019).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. Lett. 124, 032002 (2020).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 103, 012005 (2021).
M. Ablikim et al. (BESIII Collaboration), Phys. Lett. B 820, 136557 (2021).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 104, L091104 (2021).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 104, 092012 (2021).
M. Ablikim et al. (BESIII Collaboration), J. High Energy Phys. 06 (2022) 74.
M. Ablikim et al. (BESIII Collaboration), Chin. Phys. C 44, 040001 (2020).
W. Erni et al. (PANDA Collaboration), arXiv:0903.3905.
A. E. Bondar, Phys. At. Nucl. 76, 1072 (2013).
X. D. Shi, X. R. Zhou, X. S. Qin, and H. P. Peng, J. Instrum. 16, P03029 (2021).

Phys. Rev. D 108, L011101– Published 7 July, 2023

Vol. 108, Iss. 1 — 1 July 2023

Received 20 February 2023
Accepted 6 June 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L011101

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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First simultaneous measurement of $Ξ^{0}$ and ${\bar{Ξ}}^{0}$ asymmetry parameters in $ψ (3686)$ decay

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First simultaneous measurement of Ξ0 and Ξ¯0 asymmetry parameters in ψ(3686) decay

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First simultaneous measurement of $Ξ^{0}$ and ${\bar{Ξ}}^{0}$ asymmetry parameters in $ψ (3686)$ decay