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）

Cited 158|Views215

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Abstract

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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natural sciences,physical sciences

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