Search for baryon and lepton number violation in J/ψ→Λc+e−
M. Ablikim,М. Н. Ачасов,S. Ahmed,M. Albrecht,A. Amoroso,F. F. An,Q. An,J. Z. Bai,Y. Bai,O. Bakina,R. Baldini Ferroli,Y. Ban,D. W. Bennett,J. V. Bennett,N. Berger,M. Bertani,D. Bettoni,J. M. Bian,F. Bianchi,E. Boger,I. R. Boyko,R. A. Briere,H. Cai,Cai X,O. Çakır,A. Calcaterra,G. F. Cao,S. A. Çetin,J. Chai,J. F. Chang,G. Chelkov,G. Chen,H. S. Chen,J. C. Chen,M. L. Chen,P. L. Chen,S. J. Chen,X. R. Chen,Y. B. Chen,X. K. Chu,G. Cibinetto,H. L. Dai,J. P. Dai,A. Dbeyssi,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,Chao Dong,J. Dong,L. Y. Dong,M. Y. Dong,Z. L. Dou,S. X. Du,Pengfei Duan,J. Fang,S. S. Fang,Xin Fang,Y. Fang,R. Farinelli,L. Fava,S. Fegan,F. Feldbauer,G. Felici,C. Q. Feng,E. Fioravanti,M. Fritsch,C. D. Fu,Q. Gao,X. L. Gao,Yongsheng Gao,Y. G. Gao,Z. Gao,I. Garzia,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,M. H. Gu,S. Gu,Y. T. Gu,A. Q. Guo,L. B. Guo,R. P. Guo,Y. P. Guo,Z. Haddadi,S. Han,X. Q. Hao,F. A. Harris,K. L. He,X. Q. He,F. H. Heinsius,T. Held,Y. K. Heng,T. Holtmann,Z. L. Hou,Hu Chen,H. M. Hu,T. Hu,Y. Hu,G. S. Huang,J. S. Huang,X. T. Huang,X. Z. Huang,Z. Huang,T. Hussain,W. Ikegami Andersson,Q. Ji,Q. Ji,X. B. Ji,X. L. Ji,X. S. Jiang,X. Y. Jiang,J. B. Jiao,Z. Jiao,D. P. Jin,S. Jin,Y. Jin,T. Johansson,A. Julin,N. Kalantar–Nayestanaki,X. L. Kang,X. S. Kang,M. Kavatsyuk,B. C. Ke,Tabassum Khan,A. Khoukaz,P. Kiese,R. Kliemt,L. Koch,O. B. Kolcu,B. Kopf,M. Kornicer,M. Kuemmel,M. Kuessner,M. Kuhlmann,A. Kupść,W. Kühn,J. S. Lange,M. Lara,P. Larin,L. Lavezzi,S. Leiber,H. Leithoff,C. Leng,C. Li,Cheng Li,D. M. Li,F. Li,F. Y. Li,G. Li,H. B. Li,H. J. Li,J. C. Li,J. Q. Li,K. J. Li,Kang Li,Ké Li,Lei Li,P. L. Li,P. R. Li,Q. Y. Li,T. Li,W. D. Li,W. G. Li,X. L. Li,X. N. Li,X. Q. Li,Z. B. Li,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,D. X. Lin,B. Liu,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. P. Liu,J. Y. Liu,K. Liu,K. Y. Liu,Ke Liu,L. D. Liu,P. L. Liu,Q. Liu,S. B. Liu,X. Liu,Y. B. Liu,Z. A. Liu,Zhiqing Liu,Y. F. Long,X. Lou,H. J. Lü,J. G. Lü,Y. Lu,Y. P. Lu,C. L. Luo,M. X. Luo,X. L. Luo,X. R. Lyu,F. C.,H. L.,L. L.,M. M.,Q. M.,Tao Ma,X. N.,X. Y.,Y. M.,F. E. Maas,M. Maggiora,Q. A. Malik,Y. J. Mao,Z. P. Mao,S. Marcello,Z. Meng,J. G. Messchendorp,G. Mezzadri,J. Min,T. J. Min,R. E. Mitchell,X. H. Mo,Y. J. Mo,C. Morales Morales,G. Morello,N. Yu. Muchnoi,H. Muramatsu,P. Musiol,A. Mustafa,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,S. L. Niu,X. Y. Niu,S. L. Olsen,Q. Ouyang,S. Pacetti,Y. Pan,M. Papenbrock,P. Patterí,M. Pelizaeus,J. Pellegrino,H. Peng,K. Peters,J. Pettersson,J. L. Ping,R. G. Ping,A. Pitka,R. Poling,V. Prasad,H. R. Qi,M. Qi,S. Qian,C. F. Qiao,N. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,Z. Y. Qu,K. H. Rashid,C. F. Redmer,Markus Richter,M. Ripka,M. Rolo,G. Rong,Ch. Rosner,X. D. Ruan,A. Sarantsev,M. Savrié,C. Schnier,K. Schoenning,W. Shan,M. Shao,C. P. Shen,P. X. Shen,X. Y. Shen,H. Y. Sheng,J. J. Song,W. M. Song,X. Y. Song,S. Sosio,C. Sowa,S. Spataro,G. X. Sun,J. F. Sun,L. Sun,S. Sun,X. H. Sun,Y. J. Sun,Y. Sun,Y. Z. Sun,Z. J. Sun,Z. T. Sun,C. J. Tang,G. Y. Tang,X. Tang,I. Tapan,M. Tiemens,B. Tsednee,I. Uman,G. Varner,B. Wang,B. L. Wang,D. Wang,D. Y. Wang,Dan Wang,K. Wang,L. L. Wang,L. S. Wang,M. Wang,Meng Wang,P. Wang,P. L. Wang,W. P. Wang,X. F. Wang,Y. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. G. Wang,Z. H. Wang,Z. Y. Wang,Zongyuan Wang,T. Weber,D. H. Wei,P. Weidenkaff,S. P. Wen,U. Wiedner,M. Wolke,L. H. Wu,L. J. Wu,Z. Wu,L. Xia,X. M. Xia,Y. Xia,D. Xiao,H. Xiao,Y. J. Xiao,Z. J. Xiao,Y. Xie,Y. Xie,X. A. Xiong,Q. L. Xiu,G. F. Xu,J. Xu,L. Xu,Q. J. Xu,Qing Xu,X. P. Xu,Yan Liang,W. B. Yan,W. C. Yan,W. C. Yan,Y. H. Yan,H. J. Yang,H. X. Yang,L. Yang,Yifan Yang,Yifan Yang,Yifan Yang,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You,B. X. Yu,C. X. Yu,J. S. Yu,C. Z. Yuan,Y. Yuan,A. Yuncu,A. A. Zafar,A. Zallo,Y. Zeng,Z. Zeng,B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,H. H. Zhang,H. Y. Zhang,J. Zhang,J. L. Zhang,J. Q. Zhang,J. W. Zhang,J. Y. Zhang,J. Z. Zhang,K. Zhang,K. L. Zhang,L. Zhang,S. Q. Zhang,X. Y. Zhang,Y. H. Zhang,Y. T. Zhang,Yang Zhang,Yao Zhang,Yu Zhang,Z. H. Zhang,Z. P. Zhang,Z. Y. Zhang,G. Zhao,J. W. Zhao,J. Zhao,J. Z. Zhao,Zhao Liu,Ling Zhao,M. G. Zhao,Q. Zhao,S. J. Zhao,T. C. Zhao,Y. B. Zhao,Z. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,W. J. Zheng,Y. Zheng,B. Zhong,Zhou Li,X. Y. Zhou,X. K. Zhou,X. R. Zhou,X. Y. Zhou,Yi Zhou,J. Zhu,J. Zhu,K. Zhu,K. J. Zhu,S. H. Zhu,S. H. Zhu,X. Zhu,Y. Zhu,Y. S. Zhu,Z. A. Zhu,J. Zhuang,B. S. Zou,J. H. Zou
Physical review（2019）
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摘要
Using $1.31\ifmmode\times\else\texttimes\fi{}1{0}^{9}$ $J/\ensuremath{\psi}$ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{e}^{\ensuremath{-}}+\mathrm{c}.\mathrm{c}.$ for the first time. In this process, both baryon and lepton number conservation is violated. No signal is found and the upper limit on the branching fraction $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{e}^{\ensuremath{-}}+\mathrm{c}.\mathrm{c}.)$ is set to be $6.9\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}8}$ at the 90% confidence level.
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关键词
lepton number violation,baryon,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml
