标题:Observation of a Neutral Structure near the D D ¯ ∗ Mass Threshold in e+e- → (D D ¯ ∗)0π0 at s =4.226 and 4.257 GeV
作者:Ablikim, M. ;Achasov, M.N. ;Ai, X.C. ;Albayrak, O. ;Albrecht, M. ;Ambrose, D.J. ;Amoroso, A. ;An, F.F. ;An, Q. ;Bai, J.Z. ;Ferroli, R. Baldini ;Ban, Y 更多
作者机构:[Johansson, T. ;Kupsc, A. ;Li, C. ] Uppsala University, Box 516, Uppsala; SE-75120, Sweden;[Fava, L. ] University of Eastern Piedmont, Alessandria; I- 更多
来源:Physical Review Letters
出版年:2015
卷:115
期:22
DOI:10.1103/PhysRevLett.115.222002
摘要:A neutral structure in the DD¯∗ system around the DD¯∗ mass threshold is observed with a statistical significance greater than 10σ in the processes e+e-→D+D∗-π0+c.c. and e+e-→D0D¯∗0π0+c.c. at s=4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as Zc(3885)0. Assuming the presence of a resonance, its pole mass and width are determined to be [3885.7-5.7+4.3(stat)±8.4(syst)] MeV/c2 and [35-12+11(stat)±15(syst)] MeV, respectively. The Born cross sections are measured to be σ[e+e-→Zc(3885)0π0,Zc(3885)0→DD¯∗]=[77±13(stat)±17(syst)] pb at 4.226 GeV and [47±9(stat)±10(syst)] pb at 4.257 GeV. The ratio of decay rates B[Zc(3885)0→D+D∗-+c.c.]/B[Zc(3885)0→D0D¯∗0+c.c.] is determined to be 0.96±0.18(stat)±0.12(syst), consistent with no isospin violation in the process, Zc(3885)0→DD¯∗.
© 2015 American Physical Society.
收录类别:EI
资源类型:期刊论文
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