Observation of a Charged Charmoniumlike Structure in e(+)e(-) -> (D* (D)over-bar*)(+/-)pi(-/+) at root s=4.26 GeV

M. Ablikim,H. X. Yang,Z. P. Zhang,T. Hussain,H. W. Yu,T. Held,C. L. Liu,G. Varner,F.-H. Liu,W. X. Gong,S. Braun,Z. Y. He,X. Tang,Q. A. Malik,Ling Zhao,J. F. Qiu,Z. Y. Zhang,R. A. Briere,Q. G. Wen,H. B. Liu,A. Zhemchugov,K. Goetzen,J. S. Yu,S. L. Olsen,H. M. Hu,K. Peters,I. Tapan,Y.G. Xie,Long Wang,Y. F. Wang,Z. Y. Deng,Serkant Ali Cetin,J. W. Zhang,M. Wang,S. Pacetti,B. Zheng,Y.P. Chu,Zhengguo Zhao,Y. Mao,I. R. Boyko,S. X. Du,H. L. Dai,M. Destefanis,G. M. Huang,H.-P. Cheng,Fang Liu,Dayong Wang,M. Leyhe,Y. P. Guo,Y.B. Zhao,X. H. Zhao,Peng Wang,T. Ma,Y. H. Zhang,H.Y. Zhang,K. Y. Liu,C. C. Zhang,O. Fuks,Y. Huang,J. Y. Zhang,M. N. Achasov,D. X. Lin,C. H. Li,K. Moriya,K. Liu,U. Wiedner,Y.H. Guan,B. Y. Zhang,T. Hu,X.F. Wang,X. T. Huang,Z. B. Li,Z. Jiao,X. Y. Song,J. C. Li,J. L. Ping,R. E. Mitchell,G. Rong,Lei Li,H. Y. Sheng,D. M. Li,E. Prencipe,Y. C. Zhu,Z. Ning,Yankun Sun,A. Calcaterra,Feng Liu,X. L. Li,T. C. Zhao,N. Wu,S. S. Fang,L. Zhou,F. C. Ma,I. Uman,A. Q. Guo,B. J. Liu,A. Sarantsev,W. Wu,C. Z. Yuan,L. Xia,Q. Ji,Weidong Li,L. Q. Qin,H. H. Liu,Q. An,Achim Denig,J. S. Lange,D. V. Dedovich,L. Zhang,J. S. Huang,A. Zallo,C. X. Yu,D. Wang,Z. R. Xu,J. Z. Zhang,C. D. Fu,O. Cakir,K. L. He,E. H. Thorndike,J. P. Zheng,S. L. Zang,Ming Shao,Z. A. Zhu,M. Qi,Z. A. Liu,B. Kloss,S. P. Wen,G. F. Cao,O. Bondarenko,Z. Xue,O. Albayrak,X K Zhou,X. Y. Shen,Y. B. Liu,G. F. Xu,C. F. Qiao,X. R. Chen,Zhe Wang,Y. T. Gu,Jianyi Chen,S. Chen,H. B. Li,X. L. Wang,J.B. Jiao,Y. Nefedov,F. E. Maas,X. B. Ji,M. Ye,L. Fava,F. F. An,H.J. Lu,L. L. Jiang,X. T. Liao,R. Baldini Ferroli,H. Liang,Y. H. Zheng,Y. Xia,Y. Q. Wang,J. Q. Zhang,H. H. Liu,L.H. Wu,M. He,Z. T. Sun,B. X. Yu,Z. H. Qin,J. Fu,N. Kalantar-Nayestanaki,Y. Ding,G. Zhao,Z. Wang,X. Cai,D. H. Sun,C. L. Luo,Q. Ouyang,Y. Zhang,C. Zhu,C. P. Shen,Liang Yan,B. Spruck,H. P. Peng,Pei-Rong Li,M. X. Luo,Christoph Redmer,Y. S. Zhu,Zhiqing Liu,Q. Liu,M. Pelizaeus,Q. Ji,Y. D. Wang,Y. Lu,J. Fang,H. Ye,Z. J. Sun,W. D. Li,X. L. Luo,L. D. Liu,L. Y. Dong,J. B. Wei,B. Zhong,R. Poling,S. B. Liu,J. Min,X. Zhou,W. Gradl,T. J. Min,P. L. Liu,L. B. Guo,Qiang Zhao,B. S. Zou,Cui Li,C. Q. Feng,X. S. Jiang,X. L. Ji,H. Loehner,H. Muramatsu,G. Li,C. J. Tang,C. X. Liu,M. Ullrich,E. Boger,M. Maggiora,Z. L. Hou,S. H. Zhu,Zepu Mao,J. Becker,Zhiqiang Liu,Y. H. Yan,X. R. Li,J. F. Chang,M. Kavatsyuk,H. M. Liu,Mary Chen,S. Qian,M. R. Shepherd,Z.G. Wang,Cheng Li,C. Hu,B. L. Wang,Y. B. Chen,F. A. Harris,Xinping Xu,X. J. Zhang,S. Wang,K. Wang,X. Y. Ma,J. F. Sun,Y. Z. Sun,C. Geng,C. Morales Morales,Shulin Sun,M. Bertani,K. Zhu,C. Zhang,J. Z. Bai,M. H. Ye,Q. M. Ma,K. H. Rashid,X. C. Lou,Q. J. Wang,D. P. Jin,Y. Ban,S. J. Zhao,M. G. Zhao,H. L. Ma,K. J. Zhu,V. Bytev,J. W. Zhao,J. M. Bian,Kang Li,D. Cronin-Hennessy,Y. Zeng,Y. Yang,Pengfei Wang,D. H. Wei,M. H. Gu,H. Moeini,T. Luo,J. G. Messchendorp,R. G. Ping,G. R. Lu,H.S. Chen,S. P. Yu,N. Yu. Muchnoi,D. H. Zhang,J. H. Zou,M. Greco,X. N. Li,H. S. Zhao,Y. F. Liang,G. R. Liao,P. Weidenkaff,X. D. Ruan,C. S. Ji,Z. Wu,G. S. Huang,X. Q. Li,J. V. Bennett,Qingjun Xu,X.R. Zhou,I. Denysenko,S. Zhang,Y. Gao,M. Kornicer,I. B. Nikolaev,G. Chen,T. Guo,W.M. Song,P. Larin,L. Huang,Lei Zhao,M. Y. Dong,M. Lv,W. Lai,X. H. Mo,W. Kuehn,X. S. Qin,J. F. Hu,P. Friedel,Y. Qin,H. H. Zhang,Q. Li,D. Toth,L. L. Wang,W. B. Yan,S. Spataro,F. Jing,J.W. Park,R. Zhang,X. Zhang,F. Li,Z. J. Xiao,Y. T. Liang,B. X. Zhang,J. P. Dai,Q. N. Xu,J G Lu,M. Werner,X. R. Lu,X. Liu,A. A. Zafar,B. Kopf,J. Zhuang,S.X. Wu,Shi-Lun Jin,M. Lara,Y. Yuan,Q. L. Xiu,Y. X. Yang,Z. P. Zhang,G. A. Chelkov,H Cai,D. J. Ambrose,W. M. Ding,H. W. Liu,X. Zhu,Y. K. Heng,G. X. Sun,J. P. Liu,Y. L. Han,S. Ma

Observation of a Charged Charmoniumlike Structure in e(+)e(-) -> (D* (D)over-bar*)(+/-)pi(-/+) at root s=4.26 GeV

2013

We study the process e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) at a center-of-mass energy of 4.26 GeV using a 827 pb(-1) data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137 +/- 9 +/- 15) pb. We observe a structure near the (D* (D) over bar*)(+/-) threshold in the pi(-/+) recoil mass spectrum, which we denote as the Z(c)(+/-) (4025). The measured mass and width of the structure are (4026.3 +/- 2.6 +/- 3.7) MeV/c(2) and (24.8 +/- 5.6 +/- 7.7) MeV, respectively. Its production ratio sigma(e(+)e(-) -> Z(c)(+/-)(4025)pi(-/+)-> (D* (D) over bar*)(+/-)pi(-/+)/sigma(e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) is determined to be 0.65 +/- 0.09 +/- 0.06. The first uncertainties are statistical and the second are systematic.

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