Search for $\bar{\Lambda}$-$\Lambda$ oscillations in the decay $J/\psi
\to p K^- \bar{\Lambda}+c.c.$
BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,S. Ahmed,M. Albrecht,R. Aliberti,A. Amoroso,Q. An,Y. Bai,O. Bakina,R. Baldini Ferroli,I. Balossino,Y. Ban,K. Begzsuren,N. Berger,M. Bertani,D. Bettoni,F. Bianchi,J. Bloms,A. Bortone,I. Boyko,R. A. Briere,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,W. L. Chang,G. Chelkov,G. Chen,H. S. Chen,M. L. Chen,S. J. Chen,X. R. Chen,Y. B. Chen,Z. J. Chen,W. S. Cheng,G. Cibinetto,F. Cossio,H. L. Dai,J. P. Dai,X. C. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,J. Dong,L. Y. Dong,M. Y. Dong,X. Dong,S. X. Du,J. Fang,S. S. Fang,Y. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,M. Fritsch,C. D. Fu,Y. N. Gao,Ya Gao,Yang Gao,I. Garzia,E. M. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,L. M. Gu,M. H. Gu,S. Gu,Y. T. Gu,C. Y Guan,A. Q. Guo,L. B. Guo,R. P. Guo,Y. P. Guo,A. Guskov,T. T. Han,X. Q. Hao,F. A. Harris,K. L. He,F. H. H. Heinsius,C. H. Heinz,Y. K. Heng,C. Herold,M. Himmelreich,T. Holtmann,Y. R. Hou,Z. L. Hou,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang,L. Q. Huang,X. T. Huang,Y. P. Huang,T. Hussain,W. Imoehl,M. Irshad,S. Jaeger,S. Janchiv,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,X. S. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,T. Johansson,N. Kalantar-Nayestanaki,X. S. Kang,R. Kappert,M. Kavatsyuk,B. C. Ke,I. K. Keshk,A. Khoukaz,P. Kiese,R. Kiuchi,R. Kliemt,O. B. Kolcu,B. Kopf,M. Kuemmel,M. K. Kuessner,A. Kupsc,M. G. Kurth,W. Kühn,J. J. Lane,P. Larin,A. Lavania,L. Lavezzi,Z. H. Lei,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li,H. Li,H. B. Li,H. J. Li,J. Q. Li,J. W. Li,Ke Li,L. K. Li,Lei Li,P. L. Li,P. R. Li,S. Y. Li,W. D. Li,W. G. Li,X. H. Li,X. L. Li,Z. Y. Li,H. Liang,H. Liang,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,L. Z. Liao,J. Libby,A. Limphirat,B. J. Liu,C. X. Liu,D. Liu,F. H. Liu,Fang Liu,Feng Liu,H. B. Liu,H. M. Liu,Huanhuan Liu,Huihui Liu,J. B. Liu,J. Y. Liu,K. Liu,K. Y. Liu,L. Liu,M. H. Liu,Q. Liu,S. B. Liu,Shuai Liu,T. Liu,W. M. Liu,X. Liu,Y. B. Liu,Z. A. Liu,Z. Q. Liu,X. C. Lou,F. X. Lu,H. J. Lu,J. D. Lu,J. G. Lu,X. L. Lu,Y. Lu,Y. P. Lu,C. L. Luo,M. X. Luo,T. Luo,X. L. Luo,S. Lusso,X. R. Lyu,F. C. Ma,H. L. Ma,L. L. Ma,M. M. Ma,Q. M. Ma,R. Q. Ma,R. T. Ma,X. X. Ma,X. Y. Ma,F. E. Maas,M. Maggiora,S. Maldaner,S. Malde,Q. A. Malik,A. Mangoni,Y. J. Mao,Z. P. Mao,S. Marcello,Z. X. Meng,J. G. Messchendorp,G. Mezzadri,T. J. Min,R. E. Mitchell,X. H. Mo,N. Yu. Muchnoi,H. Muramatsu,S. Nakhoul,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,S. L. Olsen,Q. Ouyang,S. Pacetti,X. Pan,Y. Pan,A. Pathak,P. Patteri,M. Pelizaeus,H. P. Peng,K. Peters,J. L. Ping,R. G. Ping,A. Pitka,R. Poling,V. Prasad,H. Qi,H. R. Qi,M. Qi,T. Y. Qi,S. Qian,W. B. Qian,C. F. Qiao,L. Q. Qin,X. P. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,S. Q. Qu,S. Q. Qu,K. Ravindran,C. F. Redmer,A. Rivetti,V. Rodin,M. Rolo,G. Rong,Ch. Rosner,A. Sarantsev,Y. Schelhaas,C. Schnier,K. Schoenning,M. Scodeggio,D. C. Shan,W. Shan,X. Y. Shan,M. Shao,C. P. Shen,P. X. Shen,X. Y. Shen,H. C. Shi,R. S. Shi,X. Shi,X. D. Shi,W. M. Song,Y. X. Song,S. Sosio,S. Spataro,K. X. Su,G. X. Sun,J. F. Sun,L. Sun,S. S. Sun,T. Sun,W. Y. Sun,Y. J. Sun,Y. K. Sun,Y. Z. Sun,Z. T. Sun,Y. H. Tan,Y. X. Tan,C. J. Tang,G. Y. Tang,J. Tang,J. X. Teng,V. Thoren,I. Uman,B. Wang,B. L. Wang,C. W. Wang,D. Y. Wang,H. P. Wang,K. Wang,L. L. Wang,M. Wang,Meng Wang,W. H. Wang,W. P. Wang,X. Wang,X. F. Wang,X. L. Wang,Y. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. Y. Wang,Ziyi Wang,Zongyuan Wang,D. H. Wei,P. Weidenkaff,F. Weidner,S. P. Wen,D. J. White,U. W. Wiedner,G. Wilkinson,M. Wolke,L. Wollenberg,J. F. Wu,L. H. Wu,L. J. Wu,X. Wu,Z. Wu,L. Xia,H. Xiao,S. Y. Xiao,Z. J. Xiao,X. H. Xie,Y. G. Xie,Y. H. Xie,T. Y. Xing,G. F. Xu,J. J. Xu,Q. J. Xu,W. Xu,X. P. Xu,Y. C. Xu,F. Yan,L. Yan,W. B. Yan,W. C. Yan,Xu Yan,H. J. Yang,H. X. Yang,L. Yang,S. L. Yang,Y. H. Yang,Yifan Yang,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You,B. X. Yu,C. X. Yu,G. Yu,J. S. Yu,T. Yu,C. Z. Yuan,L. Yuan,W. Yuan,Y. Yuan,Z. Y. Yuan,C. X. Yue,A. A. Zafar,Y. Zeng,B. X. Zhang,G. Y. Zhang,H. Zhang,H. H. Zhang,H. H. Zhang,H. Y. Zhang,J. J. Zhang,J. Q. Zhang,J. W. Zhang,J. Y. Zhang,J. Z. Zhang,Jianyu Zhang,Jiawei Zhang,Lei Zhang,S. F. Zhang,X. D. Zhang,X. Y. Zhang,Y. Zhang,Y. T. Zhang,Y. H. Zhang,Yan Zhang,Yao Zhang,Z. Y. Zhang,G. Zhao,J. Zhao,J. Y. Zhao,J. Z. Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,Q. Zhao,S. J. Zhao,Y. B. Zhao,Y. X. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,Y. H. Zheng,B. Zhong,C. Zhong,L. P. Zhou,Q. Zhou,X. Zhou,X. K. Zhou,X. R. Zhou,A. N. Zhu,J. Zhu,K. Zhu,K. J. Zhu,S. H. Zhu,W. J. Zhu,W. J. Zhu,Y. C. Zhu,Z. A. Zhu,B. S. Zou,J. H. Zou
arXiv (Cornell University)（2023）
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摘要
We report the first search for $\bar\Lambda$-$\Lambda$ oscillations in the decay $J/\psi \to p K^- \bar{\Lambda} + c.c.$ by analyzing $1.31\times10^9$ $J/\psi$ events accumulated with the BESIII detector at the BEPCII collider. The $J/\psi$ events are produced using $e^+e^-$ collisions at a center of mass energy $\sqrt{s}= 3.097$ GeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of $\bar\Lambda$ to $\Lambda$ hyperons is determined to be $\mathcal{P}(\Lambda)=\frac{\mathcal{B}(J/\psi\to pK^-\Lambda+c.c.)}{\mathcal{B}(J/\psi\to pK^-\bar\Lambda+c.c.)}<4.4\times10^{-6}$ corresponding to an oscillation parameter $\delta m_{\Lambda\bar\Lambda}$ of less than $3.8\times10^{-15}$ MeV/$c^2$ at the 90\% confidence level.
