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-Jpsiˆ. 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-Jpsiˆ. 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-.
2017
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.; Baldini Ferroli, R.; Ba...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2375840
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