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Ablikim, M. [Author]; Achasov, M. N. [Author]; Bennett, J. V. [Author]; Jin, S. [Author]; Jing, F. F. [Author]; Kalantar-Nayestanaki, N. [Author]; Kavatsyuk, M. [Author]; Kloss, B. [Author]; Kopf, B. [Author]; Kornicer, M. [Author]; Kuehn, W. [Author]; Lai, W. [Author]; Lange, J. S. [Author]; Bertani, M. [Author]; Lara, M. [Author]; Larin, P. [Author]; Leyhe, M. [Author]; Li, C. H. [Author]; Li, Cheng [Author]; Li, Cui [Author]; Li, D. L. [Author]; Li, D. M. [Author]; Li, F. [Author]; Li, G. [Author]; [...]

Observation of a charged (DD¯∗)± mass peak in e+e−→πDD¯∗ at s√= 4.26 GeV

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  • Media type: E-Article
  • Title: Observation of a charged (DD¯∗)± mass peak in e+e−→πDD¯∗ at s√= 4.26 GeV
  • Contributor: Ablikim, M. [Author]; Achasov, M. N. [Author]; Bennett, J. V. [Author]; Jin, S. [Author]; Jing, F. F. [Author]; Kalantar-Nayestanaki, N. [Author]; Kavatsyuk, M. [Author]; Kloss, B. [Author]; Kopf, B. [Author]; Kornicer, M. [Author]; Kuehn, W. [Author]; Lai, W. [Author]; Lange, J. S. [Author]; Bertani, M. [Author]; Lara, M. [Author]; Larin, P. [Author]; Leyhe, M. [Author]; Li, C. H. [Author]; Li, Cheng [Author]; Li, Cui [Author]; Li, D. L. [Author]; Li, D. M. [Author]; Li, F. [Author]; Li, G. [Author]; [...]
  • imprint: APS, 2014
  • Published in: Physical review letters 112(2), 022001 (2014). doi:10.1103/PhysRevLett.112.022001
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevLett.112.022001
  • ISSN: 0031-9007; 1079-7114
  • Origination:
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  • Description: We report on a study of the process e+e−→π±(DD¯∗)∓ at s√=4.26 GeV using a 525 pb−1 data sample collected with the BESIII detector at the BEPCII storage ring. A distinct charged structure is observed in the (DD¯∗)∓ invariant mass distribution. When fitted to a mass-dependent-width Breit-Wigner line shape, the pole mass and width are determined to be Mpole=(3883.9±1.5(stat)±4.2(syst)) MeV/c2 and Γpole=(24.8±3.3(stat)±11.0(syst)) MeV. The mass and width of the structure, which we refer to as Zc(3885), are 2σ and 1σ, respectively, below those of the Zc(3900)→π±J/ψ peak observed by BESIII and Belle in π+π−J/ψ final states produced at the same center-of-mass energy. The angular distribution of the πZc(3885) system favors a JP=1+ quantum number assignment for the structure and disfavors 1− or 0−. The Born cross section times the DD¯∗ branching fraction of the Zc(3885) is measured to be σ(e+e−→π±Zc(3885)∓)×B(Zc(3885)∓→(DD¯∗)∓)=(83.5±6.6(stat)±22.0(syst)) pb. Assuming the Zc(3885)→DD¯∗ signal reported here and the Zc(3900)→πJ/ψ signal are from the same source, the partial width ratio (Γ(Zc(3885)→DD¯∗)/Γ(Zc(3900)→πJ/ψ))=6.2±1.1(stat)±2.7(syst) is determined.
  • Access State: Open Access