Observation Of E(+)E(-) -> Pi(0)Pi(0)H(C) And A Neutral Charmoniumlike Structure Z(C)(4020)(0)

M Ablikim,M N Achasov,X C Ai,O Albayrak,Martin Albrecht,D Ambrose,A Amoroso, F F An, Q An,J Z Bai,R Baldini Ferroli, Y Ban,D W Bennett,J V Bennett,M Bertani,D Bettoni,J M Bian,F Bianchi,E Boger,O Bondarenko, I Boyko,R A Briere,Hui Cai,Xieyi Cai,O Cakir,A Calcaterra,G F Cao, S A Cetin,J F Chang, G A Chelkov,Guangping 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,Y P Chu,G Cibinetto,D Croninhennessy,H L Dai,J P Dai,D V Dedovich,Z Y Deng,A G Denig,I Denysenko,M Destefanis,F De Mori,Yongsheng Ding,Chen Dong,Jiayi Dong,L Y Dong,M Y Dong,S X Du, P F Duan,J Z Fan,Jing Fang,S S Fang,X Fang,Yaquan Fang, L Fava, F Feldbauer,G Felici,C Q Feng,E Fioravanti, C D Fu,Q Gao,Y Gao, I Garzia,K Goetzen,W X Gong,W Gradl,Maria S Greco,M H Gu,Y T Gu, Y H Guan,A Q Guo,L B Guo,T Guo,Y P Guo,Z Haddadi,A Hafner,Shuangyin Han,Y L Han,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,Garng M Huang,H P Huang,J S Huang,X T Huang, Yu Huang,T Hussain,Q P Ji,X B Ji,L W Jiang, X S Jiang,J B Jiao,Ziti Jiao,D P Jin,S Jin,Tord Johansson, A Julin,N Kalantarnayestanaki,X L Kang,M Kavatsyuk, B C Ke, R Kliemt, B Kloss,O B Kolcu, B Kopf,M Kornicer,W Kuehn,A Kupsc,Wuyan Lai, J S Lange, Monica R Lara,P Larin,M Leyhe, Cheng Li,D M Li,Fei Li,Gang Li,H B Li, J C Li,Keqiang Li,Q J Li, T Li,W D Li,X M Li,Z B Li,H Liang,Y T Liang,G R Liao,D X Lin, B J Liu, C X Liu, F H Liu, H B Liu, J Y Liu, K Y Liu, L D Liu,Qun 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,Tangnian Luo, X L Luo,Ming Lv, X R Lyu,F C Ma,H L Ma,Q M Ma,Stephanie Ma,Tsoping Ma, X N Ma,F E Maas,M Maggiora,Q A Malik,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,H Moeini,C Morales Morales,K Moriya,N Yu Muchnoi,Hisako Muramatsu,Y Nefedov, F Nerling,I B Nikolaev, Z Ning,S Nisar, S L Niu,X Y Niu,S L Olsen,Qun Ouyang,S Pacetti,P Patteri,M Pelizaeus,H P Peng,K Peters,J L Ping,R G Ping, R Poling,Y N Pu, M 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,G Rong,X D Ruan,V Santoro,A V Sarantsev,M Savrie,Karin Schonning,S Schumann, W Shan,Michael Shao,C P Shen, P X Shen, X Y Shen,H Y Sheng,M R Shepherd,W M Song,X Y Song, S Sosio,S Spataro, B Spruck,G X Sun,J F Sun,S S Sun,Y J Sun,Z J Sun,C J Tang,Xin Tang,I Tapan, E H Thorndike, M Tiemens,D Toth,M Ullrich, I Uman, G Varner,B L Wang,D Y Wang,Kai Wang,L L Wang,M Wang,P L Wang,Q J Wang,S G Wang,Wenzhi Wang,X F Wang,Y F Wang,Z H Wang,D H Wei, J B Wei,P Weidenkaff,S P Wen,U Wiedner,M Wolke,L H Wu,Zhiqiang Wu,L G Xia,Yongmei Xia,Dong Xiao,Z J Xiao,Y G Xie,Q L Xiu,G F Xu,Lin Xu, Q J Xu,X P Xu,Zhimin Xue,L Yan,W B Yan, Y H Yan,H X Yang,Liang 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,Yu Yuan, A Yuncu,A A Zafar, A Zallo,Yu Zeng,B X Zhang,C C Zhang,D H Zhang,H T Zhang, J W Zhang,Kai Zhang, L Zhang,S H Zhang,X Y Zhang,Y H Zhang, Z P Zhang,Guangyao 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,Biyuan Zheng,J P Zheng,Y H Zheng,B Zhong,Laishui Zhou,X K Zhou, K J Zhu,S Zhu,X L Zhu,Y S Zhu,Z A Zhu,J Zhuang,B S Zou,J H Zou

PHYSICAL REVIEW LETTERS（2014）

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摘要

Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of root s = 4.23, 4.26, and 4.36 GeV, we observe e(+)e(-) -> pi(0)pi(0)h(c) for the first time. The Born cross sections are measured and found to be about half of those of e(+)e(-) -> pi(+)pi(-)h(c) within less than 2 sigma. In the pi(0)h(c) mass spectrum, a structure at 4.02 GeV/c(2) is found. It is most likely to be the neutral isospin partner of the Z(c)(4020)(+/-) observed in the process of e(+)e(-) -> pi(+)pi(-)h(c) being found. A fit to the pi(0)h(c) invariant mass spectrum, with the width of the Z(c)(4020)(0) fixed to that of its charged isospin partner and possible interferences with non-Z(c)(4020)(0) amplitudes neglected, gives a mass of (4023.9 +/- 2.2 +/- 3.8) MeV/c(2) for the Z(c)(4020)(0), where the first error is statistical and the second systematic.

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