Observation of $Z_c(3900)^{0}$ in $e^+e^-\to\pi^0\pi^0 J/\psi$

M Ablikim,M N Achasov,X C Ai,O Albayrak,M Albrecht,D Ambrose,A Amoroso, F F An,Qi An, J Z Bai,R Baldini Ferroli, Y Ban,Dennis W Bennett,J V Bennett,M Bertani,D Bettoni,J M Bian,F Bianchi,E Boger, I Boyko, R A Briere,Hui Cai,Xiujun Cai,O Cakir,A Calcaterra,G F Cao, S A Cetin,J F Chang, G A Chelkov,G Chen,H S Chen,J C Chen,M L Chen,S J Chen,X R Chen, Y B Chen,H P Cheng,X K Chu,G Cibinetto,H L Dai,J P Dai, A Dbeyssi,D V Dedovich, Z Y Deng,A G Denig,I Denysenko,M Destefanis,F De Mori,Yanwei Ding,Chunhua Dong,Jun Dong, L Y Dong,M Y Dong,S X Du, P F Duan, E E Eren,J Z Fan,Jerome Fang,S S Fang, Xiangdong Fang,Yaquan Fang, L Fava, F Feldbauer,G Felici,C Q Feng,E Fioravanti,M Fritsch,C D Fu,Q Gao,X Y Gao,Y Gao,Zhanguo Gao, I Garzia, C Geng,K Goetzen,W X Gong,W Gradl,M Greco,M H Gu,Y T Gu,Y H Guan,A Q Guo,L B Guo,Y P Guo, Z Haddadi,A Hafner,Shaomei Han,Y L Han, X Q Hao,F A Harris,K L He,Z Y He,T Held,Y K Heng,Z L Hou,C Hu,H M Hu,J F Hu, T Hu, Y Hu,G S Huang, Hai Ping Huang,J S Huang,X T Huang,Y Huang,Tanveer Hussain,Q P Ji,X L Ji, L W Jiang,X Y Jiang,J B Jiao,Z Jiao,D P Jin, S Jin,Tord Johansson, A Julin,N Kalantarnayestanaki,X L Kang,M Kavatsyuk, B C Ke, P Kiese, R Kliemt, B Kloss, O B Kolcu, B Kopf,M Kornicer,W Kuehn,Andrezej Kupsc, J S Lange,M Lara,P Larin,Chenlei Leng,C H Li,D M Li, F Li,Guo Li, Hong Bin Li,J C Li, Kaiming Li, Lei Li,P R Li, T Li,W G Li,X M Li,Z B Li,Hong Liang,Y F Liang,G R Liao,D X Lin, B J Liu,C X Liu,F H Liu, H B Liu, J P Liu, K Y Liu, L D Liu, P L Liu,Qi Liu, S B Liu,X X Liu, Y B Liu,Z A Liu,H Loehner,X C Lou,H J Lu,J G Lu, R Q Lu,Y P Lu, C L Luo, M X Luo,T Luo, X L Luo,Meng Lv, X R Lyu,F C Ma,H L Ma,L L Ma,Q M Ma,Teng Ma,X Y Ma,F E Maas,M Maggiora,Y J Mao,Z P Mao,S Marcello,J G Messchendorp,J Min,T J Min,R E Mitchell,X H Mo,Y J Mo,C Morales Morales,K Moriya,N Yu Muchnoi,Hiroyuki Muramatsu,Y Nefedov, F Nerling,I B Nikolaev, Z Ning,S Nisar, S L Niu,X Y Niu,S L Olsen,Qi Ouyang,S Pacetti,P Patteri,M Pelizaeus,H P Peng,K Peters,Joachim Pettersson, J L Ping,R G Ping, R Poling,V Prasad,Y N Pu,Ming Qi,Sijin Qian,C F Qiao,L Q Qin,N Qin,X S Qin,Y Qin,Z H Qin,J F Qiu,K H Rashid, C F Redmer, H L Ren, M Ripka,Guohua Rong,Ch Rosner,X D Ruan,V Santoro,A V Sarantsev,M Savrie,Karin Schonning,S Schumann,Wenlei Shan,Ming Shao, C P Shen, P X Shen, X Y Shen,H Y Sheng,W M Song,X Y Song, S Sosio,S Spataro,G X Sun,J F Sun,S S Sun,Y Z Sun,Z T Sun,C J Tang,Xianglong Tang,I Tapan, E H Thorndike, M Tiemens,M Ullrich, I Uman, G Varner,B L Wang,D Y Wang,Kai Wang,L S Wang,M Wang,P L Wang,S G Wang,Wenjing Wang,X F Wang,Y F Wang,Z Y Wang,Thomas K Weber,D H Wei, J B Wei,P Weidenkaff,S P Wen,U Wiedner, M Wolke,L H Wu,Zhiyuan Wu,L G Xia,Yan Xia,D Xiao,Z J Xiao,Y G Xie,Q L Xiu,G F Xu,Lin Xu, Q J Xu,X P Xu,Li Yan,W B Yan, Y H Yan, H J Yang, Lujia Yang,Y X Yang,Hao Ye,M H Ye, J H Yin,B X Yu,C X Yu,H W Yu, J S Yu, C Z Yuan,W L Yuan,Yongbing Yuan, A Yuncu,A A Zafar, A Zallo,Y Zeng,B X Zhang,C C Zhang,Dong H Zhang,H H Zhang,J J Zhang,K Zhang,Ling Zhang,S H Zhang,X Y Zhang,Y N Zhang,Zhi Yong Zhang,G Zhao,J W Zhao,Ling Zhao,M G Zhao,Q W Zhao,S J Zhao,T C Zhao,Y B Zhao,Z G Zhao, A Zhemchugov,Bo Zheng,J P Zheng,W J Zheng,Y H Zheng,B Zhong,Lijun Zhou, X R Zhou, K J Zhu,S Zhu,X L Zhu,Y S Zhu,Z A Zhu,J Zhuang, L Zotti, B S Zou,J H Zou

PHYSICAL REVIEW LETTERS（2015）

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摘要

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Z(c)(3900)(0) with a significance of 10.4 sigma. The mass and width are measured to be 3894.8 +/- 2.3 +/- 3.2 MeV/c(2) and 29.6 +/- 8.2 +/- 8.2 MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e(+)e(-) -> pi(0)pi(0) J/Psi and the fraction of it attributable to pi(0)Z(c)(3900)(0) -> pi(0)pi(0) J/Psi in the range E-c.m. = 4.19-4.42 GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Z(c)(3900)(+/-).

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