标题:Observation of a charged charmoniumlike structure in e+e-→ (DD)±πat √s =4.26 GeV
作者:Ablikim, M. ;Achasov, M.N. ;Albayrak, A.O. ;Ambrose, D.J. ;An, F.F. ;An, Q. ;Bai, J.Z. ;Baldini Ferroli, R. ;Ban, Y. ;Becker, J. ;Bennett, J.V. ;Berta 更多
作者机构:[Ablikim, M. ] PNPI, Gatchina; 188300, Russia;[Boger, E. ;Chelkov, G. ;Fuks, O. ] Moscow Institute of Physics and Technology, Moscow; 141700, Russia;[ 更多
来源:Physical Review Letters
出版年:2014
卷:112
期:13
DOI:10.1103/PhysRevLett.112.132001
摘要:We study the process e+e-→ (DD)±πat a center-of-mass energy of 4.26 GeV using a 827 pb-1data 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 (DD)±threshold in the πrecoil 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/c2and (24.8 ±5.6 ± 7.7) MeV, respectively. Its production ratio σ(e+e-→ Z±c(4025)π) → (DD)±π/σ(e+e-→ (DD)±π) is determined to be 0.65 ± 0.09 ± 0.06. The first uncertainties are statistical and the second are systematic.
© 2014 American Physical Society.
收录类别:EI
资源类型:期刊论文
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