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Precise measurement of the branching fractions of $J / ψ \to \bar{Λ} π^{+} Σ^{-} + c . c .$ and $J / ψ \to \bar{Λ} π^{-} Σ^{+} + c . c .$

M. Ablikim¹, M. N. Achasov^5,b, P. Adlarson⁷⁵, X. C. Ai⁸¹, R. Aliberti³⁶, A. Amoroso^74a,74c, M. R. An⁴⁰, Q. An^71,58, Y. Bai⁵⁷ et al. (BESIII Collaboration)

Y. Bai⁵⁷, O. Bakina³⁷, I. Balossino^30a, Y. Ban^47,g, V. Batozskaya^1,45, K. Begzsuren³³, N. Berger³⁶, M. Berlowski⁴⁵, M. Bertani^29a, D. Bettoni^30a, F. Bianchi^74a,74c, E. Bianco^74a,74c, A. Bortone^74a,74c, I. Boyko³⁷, R. A. Briere⁶, A. Brueggemann⁶⁸, H. Cai⁷⁶, X. Cai^1,58, A. Calcaterra^29a, G. F. Cao^1,63, N. Cao^1,63, S. A. Cetin^62a, J. F. Chang^1,58, T. T. Chang⁷⁷, W. L. Chang^1,63, G. R. Che⁴⁴, G. Chelkov^37,a, C. Chen⁴⁴, Chao Chen⁵⁵, G. Chen¹, H. S. Chen^1,63, M. L. Chen^1,58,63, S. J. Chen⁴³, S. M. Chen⁶¹, T. Chen^1,63, X. R. Chen^32,63, X. T. Chen^1,63, Y. B. Chen^1,58, Y. Q. Chen³⁵, Z. J. Chen^26,h, W. S. Cheng^74c, S. K. Choi¹¹, X. Chu⁴⁴, G. Cibinetto^30a, S. C. Coen⁴, F. Cossio^74c, J. J. Cui⁵⁰, H. L. Dai^1,58, J. P. Dai⁷⁹, A. Dbeyssi¹⁹, R. E. de Boer⁴, D. Dedovich³⁷, Z. Y. Deng¹, A. Denig³⁶, I. Denysenko³⁷, M. Destefanis^74a,74c, F. De Mori^74a,74c, B. Ding^66,1, X. X. Ding^47,g, Y. Ding⁴¹, Y. Ding³⁵, J. Dong^1,58, L. Y. Dong^1,63, M. Y. Dong^1,58,63, X. Dong⁷⁶, M. C. Du¹, S. X. Du⁸¹, Z. H. Duan⁴³, P. Egorov^37,a, Y. L. Fan⁷⁶, J. Fang^1,58, S. S. Fang^1,63, W. X. Fang¹, Y. Fang¹, R. Farinelli^30a, L. Fava^74b,74c, F. Feldbauer⁴, G. Felici^29a, C. Q. Feng^71,58, J. H. Feng⁵⁹, K. Fischer⁶⁹, M. Fritsch⁴, C. Fritzsch⁶⁸, C. D. Fu¹, J. L. Fu⁶³, Y. W. Fu¹, H. Gao⁶³, Y. N. Gao^47,g, Yang Gao^71,58, S. Garbolino^74c, I. Garzia^30a,30b, P. T. Ge⁷⁶, Z. W. Ge⁴³, C. Geng⁵⁹, E. M. Gersabeck⁶⁷, A. Gilman⁶⁹, K. Goetzen¹⁴, L. Gong⁴¹, W. X. Gong^1,58, W. Gradl³⁶, S. Gramigna^30a,30b, M. Greco^74a,74c, M. H. Gu^1,58, Y. T. Gu¹⁶, C. Y. Guan^1,63, Z. L. Guan²³, A. Q. Guo^32,63, L. B. Guo⁴², M. J. Guo⁵⁰, R. P. Guo⁴⁹, Y. P. Guo^13,f, A. Guskov^37,a, T. T. Han⁵⁰, W. Y. Han⁴⁰, X. Q. Hao²⁰, F. A. Harris⁶⁵, K. K. He⁵⁵, K. L. He^1,63, F. H. H. Heinsius⁴, C. H. Heinz³⁶, Y. K. Heng^1,58,63, C. Herold⁶⁰, T. Holtmann⁴, P. C. Hong^13,f, G. Y. Hou^1,63, X. T. Hou^1,63, Y. R. Hou⁶³, Z. L. Hou¹, H. M. Hu^1,63, J. F. Hu^56,i, T. Hu^1,58,63, Y. Hu¹, G. S. Huang^71,58, K. X. Huang⁵⁹, L. Q. Huang^32,63, X. T. Huang⁵⁰, Y. P. Huang¹, T. Hussain⁷³, N. Hüsken^28,36, W. Imoehl²⁸, M. Irshad^71,58, J. Jackson²⁸, S. Jaeger⁴, S. Janchiv³³, J. H. Jeong¹¹, Q. Ji¹, Q. P. Ji²⁰, X. B. Ji^1,63, X. L. Ji^1,58, Y. Y. Ji⁵⁰, X. Q. Jia⁵⁰, Z. K. Jia^71,58, P. C. Jiang^47,g, S. S. Jiang⁴⁰, T. J. Jiang¹⁷, X. S. Jiang^1,58,63, Y. Jiang⁶³, J. B. Jiao⁵⁰, Z. Jiao²⁴, S. Jin⁴³, Y. Jin⁶⁶, M. Q. Jing^1,63, T. Johansson⁷⁵, X. K.¹, S. Kabana³⁴, N. Kalantar-Nayestanaki⁶⁴, X. L. Kang¹⁰, X. S. Kang⁴¹, R. Kappert⁶⁴, M. Kavatsyuk⁶⁴, B. C. Ke⁸¹, A. Khoukaz⁶⁸, R. Kiuchi¹, R. Kliemt¹⁴, O. B. Kolcu^62a, B. Kopf⁴, M. K. Kuessner⁴, A. Kupsc^45,75, W. Kühn³⁸, J. J. Lane⁶⁷, P. Larin¹⁹, A. Lavania²⁷, L. Lavezzi^74a,74c, T. T. Lei^71,k, Z. H. Lei^71,58, H. Leithoff³⁶, M. Lellmann³⁶, T. Lenz³⁶, C. Li⁴⁴, C. Li⁴⁸, C. H. Li⁴⁰, Cheng Li^71,58, D. M. Li⁸¹, F. Li^1,58, G. Li¹, H. Li^71,58, H. B. Li^1,63, H. J. Li²⁰, H. N. Li^56,i, Hui Li⁴⁴, J. R. Li⁶¹, J. S. Li⁵⁹, J. W. Li⁵⁰, K. L. Li²⁰, Ke Li¹, L. J. Li^1,63, L. K. Li¹, Lei Li³, M. H. Li⁴⁴, P. R. Li^39,j,k, Q. X. Li⁵⁰, S. X. Li¹³, T. Li⁵⁰, W. D. Li^1,63, W. G. Li¹, X. H. Li^71,58, X. L. Li⁵⁰, Xiaoyu Li^1,63, Y. G. Li^47,g, Z. J. Li⁵⁹, Z. X. Li¹⁶, C. Liang⁴³, H. Liang^1,63, H. Liang³⁵, H. Liang^71,58, Y. F. Liang⁵⁴, Y. T. Liang^32,63, G. R. Liao¹⁵, L. Z. Liao⁵⁰, Y. P. Liao^1,63, J. Libby²⁷, A. Limphirat⁶⁰, D. X. Lin^32,63, T. Lin¹, B. J. Liu¹, B. X. Liu⁷⁶, C. Liu³⁵, C. X. Liu¹, F. H. Liu⁵³, Fang Liu¹, Feng Liu⁷, G. M. Liu^56,i, H. Liu^39,j,k, H. B. Liu¹⁶, H. M. Liu^1,63, Huanhuan Liu¹, Huihui Liu²², J. B. Liu^71,58, J. L. Liu⁷², J. Y. Liu^1,63, K. Liu¹, K. Y. Liu⁴¹, Ke Liu²³, L. Liu^71,58, L. C. Liu⁴⁴, Lu Liu⁴⁴, M. H. Liu^13,f, P. L. Liu¹, Q. Liu⁶³, S. B. Liu^71,58, T. Liu^13,f, W. K. Liu⁴⁴, W. M. Liu^71,58, X. Liu^39,j,k, Y. Liu⁸¹, Y. Liu^39,j,k, Y. B. Liu⁴⁴, Z. A. Liu^1,58,63, Z. Q. Liu⁵⁰, X. C. Lou^1,58,63, F. X. Lu⁵⁹, H. J. Lu²⁴, J. G. Lu^1,58, X. L. Lu¹, Y. Lu⁸, Y. P. Lu^1,58, Z. H. Lu^1,63, C. L. Luo⁴², M. X. Luo⁸⁰, T. Luo^13,f, X. L. Luo^1,58, X. R. Lyu⁶³, Y. F. Lyu⁴⁴, F. C. Ma⁴¹, H. L. Ma¹, J. L. Ma^1,63, L. L. Ma⁵⁰, M. M. Ma^1,63, Q. M. Ma¹, R. Q. Ma^1,63, R. T. Ma⁶³, X. Y. Ma^1,58, Y. Ma^47,g, Y. M. Ma³², F. E. Maas¹⁹, M. Maggiora^74a,74c, S. Malde⁶⁹, Q. A. Malik⁷³, A. Mangoni^29b, Y. J. Mao^47,g, Z. P. Mao¹, S. Marcello^74a,74c, Z. X. Meng⁶⁶, J. G. Messchendorp^14,64, G. Mezzadri^30a, H. Miao^1,63, T. J. Min⁴³, R. E. Mitchell²⁸, X. H. Mo^1,58,63, N. Yu. Muchnoi^5,b, Y. Nefedov³⁷, F. Nerling^19,d, I. B. Nikolaev^5,b, Z. Ning^1,58, S. Nisar^12,l, Y. Niu⁵⁰, S. L. Olsen⁶³, Q. Ouyang^1,58,63, S. Pacetti^29b,29c, X. Pan⁵⁵, Y. Pan⁵⁷, A. Pathak³⁵, P. Patteri^29a, Y. P. Pei^71,58, M. Pelizaeus⁴, H. P. Peng^71,58, K. Peters^14,d, J. L. Ping⁴², R. G. Ping^1,63, S. Plura³⁶, S. Pogodin³⁷, V. Prasad³⁴, F. Z. Qi¹, H. Qi^71,58, H. R. Qi⁶¹, M. Qi⁴³, T. Y. Qi^13,f, S. Qian^1,58, W. B. Qian⁶³, C. F. Qiao⁶³, J. J. Qin⁷², L. Q. Qin¹⁵, X. P. Qin^13,f, X. S. Qin⁵⁰, Z. H. Qin^1,58, J. F. Qiu¹, S. Q. Qu⁶¹, C. F. Redmer³⁶, K. J. Ren⁴⁰, A. Rivetti^74c, V. Rodin⁶⁴, M. Rolo^74c, G. Rong^1,63, Ch. Rosner¹⁹, S. N. Ruan⁴⁴, N. Salone⁴⁵, A. Sarantsev^37,c, Y. Schelhaas³⁶, K. Schoenning⁷⁵, M. Scodeggio^30a,30b, K. Y. Shan^13,f, W. Shan²⁵, X. Y. Shan^71,58, J. F. Shangguan⁵⁵, L. G. Shao^1,63, M. Shao^71,58, C. P. Shen^13,f, H. F. Shen^1,63, W. H. Shen⁶³, X. Y. Shen^1,63, B. A. Shi⁶³, H. C. Shi^71,58, J. L. Shi¹³, J. Y. Shi¹, Q. Q. Shi⁵⁵, R. S. Shi^1,63, X. Shi^1,58, J. J. Song²⁰, T. Z. Song⁵⁹, W. M. Song ^35,1, Y. J. Song¹³, Y. X. Song^47,g, S. Sosio^74a,74c, S. Spataro^74a,74c, F. Stieler³⁶, Y. J. Su⁶³, G. B. Sun⁷⁶, G. X. Sun¹, H. Sun⁶³, H. K. Sun¹, J. F. Sun²⁰, K. Sun⁶¹, L. Sun⁷⁶, S. S. Sun^1,63, T. Sun^1,63, W. Y. Sun³⁵, Y. Sun¹⁰, Y. J. Sun^71,58, Y. Z. Sun¹, Z. T. Sun⁵⁰, Y. X. Tan^71,58, C. J. Tang⁵⁴, G. Y. Tang¹, J. Tang⁵⁹, Y. A. Tang⁷⁶, L. Y. Tao⁷², Q. T. Tao^26,h, M. Tat⁶⁹, J. X. Teng^71,58, V. Thoren⁷⁵, W. H. Tian⁵², W. H. Tian⁵⁹, Y. Tian^32,63, Z. F. Tian⁷⁶, I. Uman^62b, S. J. Wang⁵⁰, B. Wang¹, B. L. Wang⁶³, Bo Wang^71,58, C. W. Wang⁴³, D. Y. Wang^47,g, F. Wang⁷², H. J. Wang^39,j,k, H. P. Wang^1,63, J. P. Wang⁵⁰, K. Wang^1,58, L. L. Wang¹, M. Wang⁵⁰, Meng Wang^1,63, S. Wang^39,j,k, S. Wang^13,f, T. Wang^13,f, T. J. Wang⁴⁴, W. Wang⁵⁹, W. Wang⁷², W. P. Wang^71,58, X. Wang^47,g, X. F. Wang^39,j,k, X. J. Wang⁴⁰, X. L. Wang^13,f, Y. Wang⁶¹, Y. D. Wang⁴⁶, Y. F. Wang^1,58,63, Y. H. Wang⁴⁸, Y. N. Wang⁴⁶, Y. Q. Wang¹, Yaqian Wang^18,1, Yi Wang⁶¹, Z. Wang^1,58, Z. L. Wang⁷², Z. Y. Wang^1,63, Ziyi Wang⁶³, D. Wei⁷⁰, D. H. Wei¹⁵, F. Weidner⁶⁸, S. P. Wen¹, C. W. Wenzel⁴, U. W. Wiedner⁴, G. Wilkinson⁶⁹, M. Wolke⁷⁵, L. Wollenberg⁴, C. Wu⁴⁰, J. F. Wu^1,63, L. H. Wu¹, L. J. Wu^1,63, X. Wu^13,f, X. H. Wu³⁵, Y. Wu⁷¹, Y. J. Wu³², Z. Wu^1,58, L. Xia^71,58, X. M. Xian⁴⁰, T. Xiang^47,g, D. Xiao^39,j,k, G. Y. Xiao⁴³, H. Xiao^13,f, S. Y. Xiao¹, Y. L. Xiao^13,f, Z. J. Xiao⁴², C. Xie⁴³, X. H. Xie^47,g, Y. Xie⁵⁰, Y. G. Xie^1,58, Y. H. Xie⁷, Z. P. Xie^71,58, T. Y. Xing^1,63, C. F. Xu^1,63, C. J. Xu⁵⁹, G. F. Xu¹, H. Y. Xu⁶⁶, Q. J. Xu¹⁷, Q. N. Xu³¹, W. Xu^1,63, W. L. Xu⁶⁶, X. P. Xu⁵⁵, Y. C. Xu⁷⁸, Z. P. Xu⁴³, Z. S. Xu⁶³, F. Yan^13,f, L. Yan^13,f, W. B. Yan^71,58, W. C. Yan⁸¹, X. Q. Yan¹, H. J. Yang^51,e, H. L. Yang³⁵, H. X. Yang¹, Tao Yang¹, Y. Yang^13,f, Y. F. Yang⁴⁴, Y. X. Yang^1,63, Yifan Yang^1,63, Z. W. Yang^39,j,k, Z. P. Yao⁵⁰, M. Ye^1,58, M. H. Ye⁹, J. H. Yin¹, Z. Y. You⁵⁹, B. X. Yu^1,58,63, C. X. Yu⁴⁴, G. Yu^1,63, J. S. Yu^26,h, T. Yu⁷², X. D. Yu^47,g, C. Z. Yuan^1,63, L. Yuan², S. C. Yuan¹, X. Q. Yuan¹, Y. Yuan^1,63, Z. Y. Yuan⁵⁹, C. X. Yue⁴⁰, A. A. Zafar⁷³, F. R. Zeng⁵⁰, X. Zeng^13,f, Y. Zeng^26,h, Y. J. Zeng^1,63, X. Y. Zhai³⁵, Y. C. Zhai⁵⁰, Y. H. Zhan⁵⁹, A. Q. Zhang^1,63, B. L. Zhang^1,63, B. X. Zhang¹, D. H. Zhang⁴⁴, G. Y. Zhang²⁰, H. Zhang⁷¹, H. H. Zhang⁵⁹, H. H. Zhang³⁵, H. Q. Zhang^1,58,63, H. Y. Zhang^1,58, J. J. Zhang⁵², J. L. Zhang²¹, J. Q. Zhang⁴², J. W. Zhang^1,58,63, J. X. Zhang^39,j,k, J. Y. Zhang¹, J. Z. Zhang^1,63, Jianyu Zhang⁶³, Jiawei Zhang^1,63, L. M. Zhang⁶¹, L. Q. Zhang⁵⁹, Lei Zhang⁴³, P. Zhang¹, Q. Y. Zhang^40,81, Shuihan Zhang^1,63, Shulei Zhang^26,h, X. D. Zhang⁴⁶, X. M. Zhang¹, X. Y. Zhang⁵⁵, X. Y. Zhang⁵⁰, Y. Zhang⁶⁹, Y. Zhang⁷², Y. T. Zhang⁸¹, Y. H. Zhang^1,58, Yan Zhang^71,58, Yao Zhang¹, Z. H. Zhang¹, Z. L. Zhang³⁵, Z. Y. Zhang⁷⁶, Z. Y. Zhang⁴⁴, G. Zhao¹, J. Zhao⁴⁰, J. Y. Zhao^1,63, J. Z. Zhao^1,58, Lei Zhao^71,58, Ling Zhao¹, M. G. Zhao⁴⁴, S. J. Zhao⁸¹, Y. B. Zhao^1,58, Y. X. Zhao^32,63, Z. G. Zhao^71,58, A. Zhemchugov^37,a, B. Zheng⁷², J. P. Zheng^1,58, W. J. Zheng^1,63, Y. H. Zheng⁶³, B. Zhong⁴², X. Zhong⁵⁹, H. Zhou⁵⁰, L. P. Zhou^1,63, X. Zhou⁷⁶, X. K. Zhou⁷, X. R. Zhou^71,58, X. Y. Zhou⁴⁰, Y. Z. Zhou^13,f, J. Zhu⁴⁴, K. Zhu¹, K. J. Zhu^1,58,63, L. Zhu³⁵, L. X. Zhu⁶³, S. H. Zhu⁷⁰, S. Q. Zhu⁴³, T. J. Zhu^13,f, W. J. Zhu^13,f, Y. C. Zhu^71,58, Z. A. Zhu^1,63, J. H. Zou¹, and J. Zu^71,58 (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
⁵Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
⁶Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁷Central China Normal University, Wuhan 430079, People’s Republic of China
⁸Central South University, Changsha 410083, 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
¹²COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
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
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, I-00044, Frascati, Italy
^29bINFN Sezione di Perugia, I-06100, Perugia, Italy
^29cUniversity of Perugia, I-06100, Perugia, Italy
^30aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
^30bUniversity 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, 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
⁴⁹Shandong Normal University, Jinan 250014, People’s Republic of China
⁵⁰Shandong University, Jinan 250100, People’s Republic of China
⁵¹Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁵²Shanxi Normal University, Linfen 041004, People’s Republic of China
⁵³Shanxi University, Taiyuan 030006, People’s Republic of China
⁵⁴Sichuan University, Chengdu 610064, People’s Republic of China
⁵⁵Soochow University, Suzhou 215006, People’s Republic of China
⁵⁶South China Normal University, Guangzhou 510006, People’s Republic of China
⁵⁷Southeast University, Nanjing 211100, People’s Republic of China
⁵⁸State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁵⁹Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁶⁰Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁶¹Tsinghua University, Beijing 100084, People’s Republic of China
^62aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey
^62bNear East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey
⁶³University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁶⁴University of Groningen, NL-9747 AA Groningen, The Netherlands
⁶⁵University of Hawaii, Honolulu, Hawaii 96822, USA
⁶⁶University of Jinan, Jinan 250022, People’s Republic of China
⁶⁷University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
⁶⁸University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany
⁶⁹University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
⁷⁰University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁷¹University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁷²University of South China, Hengyang 421001, People’s Republic of China
⁷³University of the Punjab, Lahore-54590, Pakistan
^74aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy
^74bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
^74cINFN, I-10125, Turin, Italy
⁷⁵Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁷⁶Wuhan University, Wuhan 430072, People’s Republic of China
⁷⁷Xinyang Normal University, Xinyang 464000, People’s Republic of China
⁷⁸Yantai University, Yantai 264005, People’s Republic of China
⁷⁹Yunnan University, Kunming 650500, People’s Republic of China
⁸⁰Zhejiang University, Hangzhou 310027, People’s Republic of China
⁸¹Zhengzhou 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, 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, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^lAlso at the Department of Mathematical Sciences, IBA, Karachi 75270, Pakistan.

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Phys. Rev. D 108, 112012 – Published 21 December, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.112012

Abstract

Based on a data sample of $(10087 \pm 44) \times 10^{6} J / ψ$ events collected with the BESIII detector, the branching fraction of $J / ψ \to \bar{Λ} π^{+} Σ^{-} + c . c .$ is measured to be $(1.221 \pm 0.002 \pm 0.038) \times 10^{- 3}$ , and the branching fraction of its isospin partner mode $J / ψ \to \bar{Λ} π^{-} Σ^{+} + c . c .$ is measured to be $(1.244 \pm 0.002 \pm 0.045) \times 10^{- 3}$ with improved precision. Here the first uncertainties are statistical and the second ones systematic. The isospin symmetry of the $Σ$ baryon in charmonium hadronic decay and the “12% rule” are tested, and no violation is found. The potential of using these channels as $Σ$ baryon sources for nuclear physics research is studied, and the momentum and angular distributions of these sources are provided.

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Phys. Rev. D 108, 112012– Published 21 December, 2023

Vol. 108, Iss. 11 — 1 December 2023

Received 21 June 2023
Accepted 5 October 2023

DOI: https://doi.org/10.1103/PhysRevD.108.112012

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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Precise measurement of the branching fractions of $J / ψ \to \bar{Λ} π^{+} Σ^{-} + c . c .$ and $J / ψ \to \bar{Λ} π^{-} Σ^{+} + c . c .$

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Precise measurement of the branching fractions of J/ψ→Λ¯π+Σ−+c.c. and J/ψ→Λ¯π−Σ++c.c.

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Precise measurement of the branching fractions of $J / ψ \to \bar{Λ} π^{+} Σ^{-} + c . c .$ and $J / ψ \to \bar{Λ} π^{-} Σ^{+} + c . c .$