Determination of the Spin and Parity of the Zc (3900)

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, M. Bertani, D. Bettoni, J. M. Bian, F. Bianchi, E. Boger, I. BoykoR. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, H. Y. Chen, J. C. Chen, M. L. Chen, S. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, G. Cibinetto, H. L. Dai, J. P. Dai, A. Dbeyssi, D. Dedovich, Z. Y. Deng, A. Denig, H. Muramatsu, R. Poling, (BESIII Collaboration)

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Abstract

The spin and parity of the Zc(3900)± state are determined to be JP=1+ with a statistical significance larger than 7σ over other quantum numbers in a partial wave analysis of the process e+e-→π+π-J/ψ. We use a data sample of 1.92 fb-1 accumulated at 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 Γpole=(51.8±4.6stat±36.0syst) MeV. We also measure cross sections for the process e+e-→Zc(3900)+π-+c.c.→J/ψπ+π- and determine an upper limit at the 90% confidence level for the process e+e-→Zc(4020)+π-+c.c.→J/ψπ+π-.

Original languageEnglish (US)
Article number072001
JournalPhysical review letters
Volume119
Issue number7
DOIs
StatePublished - Aug 16 2017

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    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., Ban, Y., Bennett, D. W., Bennett, J. V., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., ... (BESIII Collaboration) (2017). Determination of the Spin and Parity of the Zc (3900). Physical review letters, 119(7), [072001]. https://doi.org/10.1103/PhysRevLett.119.072001