This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.112.022001 in citations.
Please use the identifier: http://hdl.handle.net/2128/8229 in citations.
Observation of a charged (DD¯∗)± mass peak in e+e−→πDD¯∗ at s√= 4.26 GeV
Observation of a charged (DD¯∗)± mass peak in e+e−→πDD¯∗ at s√= 4.26 GeV
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...
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Please use the identifier: http://hdl.handle.net/2128/8229 in citations.
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. |