Confirmation of a charged charmoniumlike state Z(c)(3885)(-/+) in e(+)e(-) -g pi(+/-) (D(D)over-bar*)(-/+) with double D tag

M Ablikim,M N Achasov,X C Ai,O Albayrak,M 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, I Boyko,R A Briere,Hui Cai,X Cai,O Cakir,A Calcaterra,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,Yanbing Ding, Congcong Dong,Jixin Dong,L Y Dong,M Y Dong,Sean X Du, P F Duan,J Z Fan,Jing Fang,S S Fang,Xuexun Fang,Y Fang, L Fava, F Feldbauer,G Felici,C Q Feng,E Fioravanti,M Fritsch,C D Fu,Q Gao,X L Gao,Y Gao,Z Gao, I Garzia,K Goetzen,W X Gong,W Gradl,M Greco,M H Gu,Y T Gu, Y H Guan,A Q Guo,L B Guo,R P Guo,Y P Guo, Z Haddadi,A Hafner,Shuhua Han, X Q Hao,F A Harris,K L He, X Q He,T Held,Y K Heng,Z L Hou,C Hu,H M Hu,J F Hu, T Hu, Y Hu,Garng M Huang,J S Huang,X T Huang,Yijun Huang,T Hussain,Q P Ji,X B Ji,L W Jiang,X S Jiang,J B Jiao,Zhaoyang Jiao,D P Jin,S Jin,Tord Johansson, A Julin,N Kalantarnayestanaki,X S Kang,M Kavatsyuk, B C Ke, P Kiese, R Kliemt, B Kloss,O B Kolcu, B Kopf,M Kornicer,W Kuehn,A Kupsc, J S Lange,M Lara,P Larin, C Leng, Cheng Li,D M Li,Fang Yi Li,G Li,H B Li, J C Li,K Li, Lei Li,P R Li, T Li,W G Li,X N Li,Z B Li,H Liang, J J Liang,Y F Liang,G R Liao,D X Lin, B J Liu,C X Liu,Dong Liu, F H Liu, H B Liu, J B Liu, K Y Liu,L D Liu,P L Liu, Qingsong Liu, S B Liu,Xiaohan Liu, Y B Liu,Z A Liu,H Loehner,X C Lou,H J Lu,J G Lu,Y P Lu, C L Luo, M X Luo, Ting Luo, X L Luo, X R Lyu,F C Ma,H L Ma,L L Ma, M M Ma,Q M Ma,T Ma,X Y Ma,F E Maas,M Maggiora,Y J Mao,Z P Mao,S Marcello,J G Messchendorp,J Min,R E Mitchell,X H Mo,Y J Mo,C Morales Morales,K Moriya,N Yu Muchnoi,H 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, Y Pan,P Patteri,M Pelizaeus,H P Peng,K Peters, Joachim Pettersson,J L Ping,R G Ping, R Poling,V Prasad, M Qi,Sijin Qian,C F Qiao,L Q Qin,N Qin,X S Qin,Z H Qin,J F Qiu,K H Rashid, C F Redmer, M Ripka,G Rong,Ch Rosner,X D Ruan,V Santoro, A V Sarantsev,M Savrie,K Schoenning,S Schumann, W Shan, Minling Shao, C P Shen, P X Shen, X Y Shen,H Y Sheng,M Shi,W M Song,X Y Song, S Sosio,S Spataro,G X Sun,J F Sun,S S Sun,Xiao Hua Sun,Yu Jie Sun,Z J Sun,C J Tang,Xiaoou Tang,I Tapan, E H Thorndike, M Tiemens,M Ullrich, I Uman, G Varner, Biao Wang,D Y Wang,Kai Wang,L S Wang,M Wang,P L Wang,S G Wang, Wei Ping Wang,X F Wang,Y D Wang,Z G Wang,T Weber,D H Wei, J B Wei,P Weidenkaff,S P Wen,U Wiedner,M Wolke,L H Wu,Z Wu,L G Xia,Yufeng Xia,D Xiao,H Xiao,Zhi Jian Xiao,Y G Xie,Q L Xiu,G F Xu,J J Xu,Lailin Xu, Q J Xu,X P Xu,Li Yan,W B Yan, Y H Yan,H X Yang,Lin Yang,Y X Yang,M H Ye, J H Yin,B X Yu,C X Yu,J S Yu, C Z Yuan,W L Yuan,Yuan Yuan, A Yuncu,A A Zafar, A Zallo,Y Zeng, Zhong Zeng, B X Zhang,C C Zhang, D H Zhang, Han Han Zhang, J Z Zhang, Kexiong Zhang,Lei Zhang, X Y Zhang, Y H Zhang, Z Y Zhang,G Zhao,J Z Zhao,Ling Zhao,M G Zhao, Q W Zhao,S J Zhao,T C Zhao,Y B Zhao,Z G Zhao, A Zhemchugov,Bojian Zheng,J P Zheng,W J Zheng,Y H Zheng,Biao Zhong,Lei Zhou, X R Zhou, K J Zhu,S H Zhu, X L Zhu,Y S Zhu,Z A Zhu,J Zhuang, L Zotti,B S Zou,J H Zou

PHYSICAL REVIEW D（2015）

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摘要

We present a study of the process e(+)e(-) -> pi(+/-) (D (D) over bar*)(-/+) using data samples of 1092 pb(-1) at root s = 4.23 GeV and 826 pb(-1) at root s = 4.26 GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the D meson pair and the bachelor pi(+) in the final state, we confirm the existence of the charged structure Z(c) (3885)(-/+) in the (D (D) over bar*)(-/+) system in the two isospin processes e(+)e(-) -> pi(+DD)-D-0*(-) and e(+)e(-) -> pi+D-D*(0). By performing a simultaneous fit, the statistical significance of Zc(3885)(-/+) signal is determined to be greater than 10 sigma, and its pole mass and width are measured to be M-pole = (3881.7 +/- 1.6(stat) +/- 1.6(syst)) MeV/c(2) and Gamma(pole) = (26.6 +/- 2.0(stat) +/- 2.1(syst)) MeV, respectively. The Born cross section times the (D (D) over bar*)(-/+) branching fraction (sigma(e(+)e(-) -> pi(+/-)Z(c)(3885)(-/+)) x Br(Z(c)(3885)(-/+) -> (D (D) over bar*)(-/+) )) is measured to be (141.6 +/- 7.9(stat) +/- 12.3(syst)) pb at root s = 4.23 GeV and (108.4 +/- 6.9(stat) +/- 8.8(syst)) pb at root s = 4.26 GeV. The polar angular distribution of the pi(+) - Z(c)(3885)(-/+) system is consistent with the expectation of a quantum number assignment of J(P) = 1(+) for Z(c)(3885)(-/+).

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