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Achasov, M. N.; Ahmed, S.; Amoroso, A.; An, F. F.; Bennett, D. W.; Bian, J. M.; Cai, X.; Cakir, O.; Calcaterra, A.; Chang, J. F.; Chu, X. K.; Dai, H. L.; Dbeyssi, A.; De Mori, F.; Ding, Y.; Dong, M. Y.; Fava, L.; Felici, G.; Gao, Z.; Guan, Y. H.; Hafner, A.; He, K. L.; Heng, Y. K.; Hu, C.; Huang, G. S.; Huang, X. T.; Huang, Z. L.; Ji, Q. P.; Kang, X. L.; Ke, B. C.; Kloss, B.; Kühn, W.; Lara, M.; Li, H. B.; Li, Jin; Li, Q. Y.; Li, W. D.; Li, X. N.; Li, Y. B.; Liang, Y. T.; Liao, G. R.; Liu, B. J.; Liu, C. X.; Liu, F. H.; Liu, Feng; Liu, J.; Liu, Q.; Liu, Y. Y.; Lu, Y. P.; Ma, H. L.; Ma, Y. M.; Maggiora, M.; Malik, Q. A.; Mezzadri, G.; Mo, X. H.; Musiol, P.; Ouyang, Q.; Pelizaeus, M.; Pettersson, J.; Ping, R. G.; Qian, S.; Qin, N.; Qin, Z. H.; Rosner, Ch; Ruan, X. D.; Song, W. M.; Song, X. Y.; Sun, S. S.; Sun, X. H.; Sun, Z. T.; Tang, C. J.; Tang, X.; Thorndike, E. H.; Tiemens, M.; Uman, I.; Wang, D. Y.; Wang, L. S.; Wang, Y. Q.; Wang, Z. G.; Wu, L. J.; Xiao, Z. J.; Xu, L.; Xu, Q. N.; Yan, L.; Yan, W. B.; Yang, L.; Ye, M.; Ye, M. H.; You, Z. Y.; Zafar, A. A.; Zhang, B. X.; Zhang, B. Y.; Zhang, J. Q.; Zhang, S. Q.; Zhang, X. Y.; Zhao, J. W.; Zhao, T. C.; Zheng, B.; Zhu, K.; Zou, B. S.
Physical review. D, 08/2017, Volume: 96, Issue: 3Journal Article
We study the process e+e−→π+π−ψ(3686) using 5.1 fb−1 of data collected at 16 center-of-mass energy (s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e+e−→π+π−ψ(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M=4209.5±7.4±1.4 MeV/c2 and Γ=80.1±24.6±2.9 MeV, and the second has M=4383.8±4.2±0.8 MeV/c2 and Γ=84.2±12.5±2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e+e−→π+π−ψ(3686) for the first time with a statistical significance of 5.8σ. A charged charmoniumlike structure is observed in the π±ψ(3686) invariant mass spectrum for data at s=4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M=4032.1±2.4 MeV/c2, where the errors are statistical only. However, there are still unresolved discrepancies between the fit model and data. The width of the intermediate state varies in a wide range for different kinematic regions within the data set. Therefore, no simple interpretation of the data has been found, and a future data sample with larger statistics and more theoretical input will be required to better understand this issue.
