The spin and parity of the Zc(3900)± state are determined to be JP=1+ with a statistical significance larger than 7sigma over other quantum numbers in a partial wave analysis of the process e+e--->pi+pi-Jpsi. We use a data sample of 1.92 fb-1 accumulated at sqrt(s)=4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Zc(3900)± with a Flatté-like formula, we determine its pole mass Mpole=(3881.2±4.2stat±52.7syst) MeV/c2 and pole width Delta_pole=(51.8±4.6stat±36.0syst) MeV. We also measure cross sections for the process e+e--->Zc(3900)+pi- + c.c. --> Jpsi pi+pi- and determine an upper limit at the 90% confidence level for the process e+e--->Zc(4020)+pi-+ c.c. --> Jpsi pi+pi-.
Determination of the Spin and Parity of the Zc (3900)
FARINELLI, Riccardo;GARZIA, Isabella;
2017
Abstract
The spin and parity of the Zc(3900)± state are determined to be JP=1+ with a statistical significance larger than 7sigma over other quantum numbers in a partial wave analysis of the process e+e--->pi+pi-Jpsi. We use a data sample of 1.92 fb-1 accumulated at sqrt(s)=4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Zc(3900)± with a Flatté-like formula, we determine its pole mass Mpole=(3881.2±4.2stat±52.7syst) MeV/c2 and pole width Delta_pole=(51.8±4.6stat±36.0syst) MeV. We also measure cross sections for the process e+e--->Zc(3900)+pi- + c.c. --> Jpsi pi+pi- and determine an upper limit at the 90% confidence level for the process e+e--->Zc(4020)+pi-+ c.c. --> Jpsi pi+pi-.File | Dimensione | Formato | |
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PhysRevLett.119.072001.pdf
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