Search for K0SK0S in J/ψ and ψ(2S) decays

J.Z. Bai,Y. Ban,J.G. Bian,X. Cai,J.F. Chang,H.F. Chen,H.S. Chen,H.X. Chen, J. Chen,J.C. Chen,Jun Chen,M.L. Chen,Y.B. Chen,S.P. Chi,Y.P. Chu,X.Z. Cui,H.L. Dai,Y.S. Dai,Z.Y. Deng,L.Y. Dong,S.X. Du,Z.Z. Du,J. Fang,S.S. Fang,C.D. Fu,H.Y. Fu,L.P. Fu,C.S. Gao,M.L. Gao,Y.N. Gao,M.Y. Gong,W.X. Gong,S.D. Gu,Y.N. Guo,Y.Q. Guo,Z.J. Guo,S.W. Han,F.A. Harris,J. He,K.L. He,M. He,X. He,Y.K. Heng,H.M. Hu,T. Hu,G.S. Huang,L. Huang,X.P. Huang,X.B. Ji,Q.Y. Jia,C.H. Jiang,X.S. Jiang,D.P. Jin,S. Jin,Y. Jin,Y.F. Lai,F. Li,G. Li,H.H. Li,J. Li,J.C. Li,Q.J. Li,R.B. Li,R.Y. Li, S.M. Li,W. Li,W.G. Li,X.L. Li,X.Q. Li,X.S. Li,Y.F. Liang,H.B. Liao,C.X. Liu,Fang Liu,F. Liu,H.M. Liu, J.B. Liu,J.P. Liu,R.G. Liu,Y. Liu,Z.A. Liu,Z.X. Liu,G.R. Lu,F. Lu,J.G. Lu,C.L. Luo,X.L. Luo,F.C. Ma,J.M. Ma,L.L. Ma,X.Y. Ma,Z.P. Mao,X.C. Meng,X.H. Mo,J. Nie,Z.D. Nie,S.L. Olsen,H.P. Peng,N.D. Qi,C.D. Qian,H. Qin,J.F. Qiu,Z.Y. Ren,G. Rong,L.Y. Shan, L. Shang,D.L. Shen,X.Y. Shen,H.Y. Sheng,F. Shi,X. Shi,L.W. Song,H.S. Sun,S.S. Sun,Y.Z. Sun,Z.J. Sun,X. Tang,N. Tao,Y.R. Tian,G.L. Tong,G.S. Varner,D.Y. Wang,J.Z. Wang,L. Wang,L.S. Wang,M. Wang,Meng Wang,P. Wang,P.L. Wang,S.Z. Wang,W.F. Wang,Y.F. Wang,Zhe Wang, Z. Wang,Zheng Wang,Z.Y. Wang,C.L. Wei,N. Wu,Y.M. Wu,X.M. Xia,X.X. Xie,B. Xin,G.F. Xu,H. Xu,Y. Xu,S.T. Xue,M.L. Yan,W.B. Yan,F. Yang,H.X. Yang,J. Yang,S.D. Yang,Y.X. Yang,L.H. Yi,Z.Y. Yi,M. Ye,M.H. Ye,Y.X. Ye,C.S. Yu,G.W. Yu,C.Z. Yuan,J.M. Yuan,Y. Yuan,Q. Yue,S.L. Zang,Y. Zeng,B.X. Zhang,B.Y. Zhang,C.C. Zhang,D.H. Zhang,H.Y. Zhang,J. Zhang,J.M. Zhang,J.Y. Zhang,J.W. Zhang,L.S. Zhang,Q.J. Zhang,S.Q. Zhang,X.M. Zhang,X.Y. Zhang,Yiyun Zhang,Y.J. Zhang,Y.Y. Zhang,Z.P. Zhang,Z.Q. Zhang, D.X. Zhao,J.B. Zhao,J.W. Zhao,P.P. Zhao,W.R. Zhao,X.J. Zhao,Y.B. Zhao,Z.G. Zhao,H.Q. Zheng,J.P. Zheng,L.S. Zheng,Z.P. Zheng,X.C. Zhong,B.Q. Zhou,G.M. Zhou,L. Zhou,N.F. Zhou,K.J. Zhu,Q.M. Zhu,Yingchun Zhu,Y.C. Zhu, Y.S. Zhu,Z.A. Zhu,B.A. Zhuang,B.S. Zou

user-5dd52aee530c701191bf1b99（2004）

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摘要

Abstract The CP violating processes J / ψ → K 0 S K 0 S and ψ (2 S )→ K 0 S K 0 S are searched for using samples of 58 million J / ψ and 14 million ψ (2 S ) events collected with the Beijing spectrometer at the Beijing electron–positron collider. No signal is observed, and upper limits on the decay branching ratios are determined to be B (J/ψ→K 0 S K 0 S ) −6 and B (ψ(2S)→K 0 S K 0 S ) −6 at the 95% confidence level.

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关键词

Electron–positron annihilation,Collider,Nuclear physics,Physics,Spectrometer,Atomic physics,Branching (version control)

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