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Ahmed, S.; Amoroso, A.; Balossino Balossino, I.; Bennett, J.V.; Cai, X.; Calcaterra, A.; Chang, W.L.; Chen, D.Y.; Chen, H.S.; Chen, Y.B.; De Mori, F.; Dong, L.Y.; Dong, M.Y.; Fava, L.; Felici, G.; Fritsch, M.; Gao, X.L.; Gao, Y.G.; Gao, Z.; Goetzen, K.; Gong, L.; Guo, R.P.; Heinsius, F.H.; Himmelreich, M.; Hou, Z.L.; Hu, Y.; Huang, J.S.; Irshad, M.; Ji, X.L.; Jiang, X.S.; Johansson, T.; Kappert, R.; Khoukaz, A.; Koch, L.; Kolcu, O.B.; Kuessner, M.; Kühn, W.; Li, W.G.; Li, X.L.; Li, X.Q.; Li, Z.Y.; Liang, Y.F.; Liao, L.Z.; Libby, J.; Lin, C.X.; Lin, D.X.; Liu, C.X.; Liu, H.B.; Liu, L.D.; Liu, L.Y.; Liu, S.B.; Liu, T.; Liu, Zhiqing; Lusso, S.; Ma, X.X.; Mezzadri, G.; Mo, X.H.; Ouyang, Q.; Pettersson, J.; Qin, Z.H.; Qiu, J.F.; Richter, M.; Shi, X.; Shi, X.D.; Song, Q.Q.; Sowa, C.; Sui, F.F.; Sun, J.F.; Sun, Y.J.; Sun, Z.T.; Wang, D.Y.; Wang, Z.; Wu, Z.; Xia, L.; Xiao, S.Y.; Xie, Y.H.; Xiong, X.A.; Xu, Q.J.; Xu, W.; Yan, F.; Yan, W.B.; Yan, Y.H.; Yang, H.J.; Yang, Y.H.; Yang, Z.Q.; Ye, M.; Yu, B.X.; Yu, C.X.; Zafar, A.A.; Zhang, D.H.; Zhang, H.Y.; Zhang, Y.T.; Zhang, Yi; Zhang, Z.P.; Zhao, J.W.; Zhou, L.; Zhou, L.P.; Zhou, X.R.; Zhu, K.J.; Zhu, Y.S.
Physics letters. B, 05/2020, Volume: 804, Issue: CJournal Article
We report a study of the e+e– → D+D–π+π– process using e+e– collision data samples with an integrated luminosity of 2.5 fb–1 at center-of-mass energies from 4.36 to 4.60GeV, collected with the BESIII detector at the BEPCII storage ring. The D1(2420)+ is observed in the D+π+π– mass spectrum. The mass and width of the D1(2420)+ are measured to be (2427.2 ± 1.0stat. ± 1.2syst.)MeV/c2 and (23.2 ± 2.3stat. ± 2.3syst.)MeV, respectively. The first errors are statistical and the second ones are systematic. In addition, the Born cross sections of the e+e– → D1(2420)+ D– + c.c. → D+D–π+π– and e+e– → ψ(3770)π+π– → D+D–π+π– processes are measured as a function of the center-of-mass energy.
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