Search for the Invisible Decay of J / ψ in ψ ( 2 S ) → π + π − J / ψ
H L Ma,F C Ma,C L Luo,J G Lu,G R Lu,F Lu,Y C Lou,Z A Liu,R G Liu,Qi Liu,J P Liu,H M Liu,Fang Liu, C X Liu,B J Liu,H B Liao,Y F Liang,X N Li,W G Li,S M Li,R Y Li, Jinmei Li,H B Li,Guoqing Li,Y F Lai,Shan Jin,D P Jin,J B Jiao,X S Jiang,X B Ji,X T Huang,T Hu,J H Hu,H M Hu,J Hou,Y K Heng,Mai He,K L He,F A Harris,Z J Guo,Y N Guo,Y T Gu,S D Gu,Y N Gao,C S Gao,C D Fu,S S Fang,Jingyun Fang,S X Du,Q F Dong,Z Y Deng,L Y Diao,Y S Dai,Y P Chu,Y B Chen,J C Chen,H F Chen,X Cai,Y Ban,J Z Bai,M Ablikim, Yohan Jin,B S Zou,X A Zhuang,B A Zhuang,Z A Zhu,Y S Zhu,Q M Zhu,K J Zhu,Liping Zhou,Z P Zheng,J P Zheng,H Q Zheng,Z G Zhao,W R Zhao,P P Zhao,M G Zhao,J W Zhao,D X Zhao,Z X Zhang,Yiyun Zhang,X Y Zhang,S H Zhang,J W Zhang,H Q Zhang,Dong H Zhang,C C Zhang,B X Zhang,Y Zeng,S L Zang,Yuan Yuan,C Z Yuan,G W Yu,Y X Ye,M H Ye,Y X Yang, H X Yang,M L Yan, Yan Xu,X P Xu,G F Xu,X X Xie,X M Xia,N Wu,Yao Weng,U Wiedner,D H Wei,C L Wei, Z Y Wang,Y F Wang,P L Wang,Meiyan Wang,L S Wang, D Y Wang,G Varner,G L Tong,X Tang,Z J Sun,Y Z Sun,S S Sun,H S Sun,H Y Sheng,X Y Shen,D L Shen,C P Shen,L Shang,L Y Shan,X D Ruan,G Rong,Z Y Ren,J F Qiu,Hong Qin,N D Qi,R G Ping,S L Olsen,J Nie,X H Mo,Z P Mao,Q M Ma,L L Ma Physical Review Letters（2008）
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