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EnglishWe study the process e+e- → pi+pi-ψ(3686) using 5.1 fb−1 of data collected at 16 center-of-mass energy ( sqrt(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− → pi+pi−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 pm 7.4 pm 1.4 MeV/c2 andΓ=80.1 pm 24.6 pm 2.9MeV,and the second has M=4383.8 pm 4.2 pm 0.8 MeV/c2 and Γ = 84.2 pm 12.5 pm 2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e+e− → pi+pi−ψ(3686) for the first time with a statistical significance of 5.8 sigma. A charged charmoniumlike structure is observed in the π(+-)ψ(3686) invariant mass spectrum for data at sqrt(s) = 4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M = 4032.1 pm 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.
| Data di pubblicazione: | 2017 | |
| Titolo: | Measurement of e+e−→π+π−ψ(3686) from 4.008 to 4.600 GeV and observation of a charged structure in the π±ψ(3686) mass spectrum | |
| Autori: | Ablikim, M.; Achasov, M. . n.; Ahmed, S.; Ai, X. . c.; Albayrak, O.; Albrecht, M.; Ambrose, D. . j.; Amoroso, A.; An, F. . f.; An, Q.; Bai, J. . z.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. . w.; Bennett, J. . v.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. . m.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. . a.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. . f.; Cetin, S. . a.; Chai, J.; Chang, J. . f.; Chelkov, G.; Chen, G.; Chen, H. . s.; Chen, J. . c.; Chen, M. . l.; Chen, S.; Chen, S. . j.; Chen, X.; Chen, X. . r.; Chen, Y. . b.; Chu, X. . k.; Cibinetto, G.; Dai, H. . l.; Dai, J. . p.; Dbeyssi, A.; Dedovich, D.; Deng, Z. . y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. . y.; Dong, M. . y.; Dou, Z. . l.; Du, S. . x.; Duan, P. . f.; Fan, J. . z.; Fang, J.; Fang, S. . s.; Fang, X.; Fang, Y.; Farinelli, Riccardo; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. . q.; Fioravanti, E.; Fritsch, M.; Fu, C. . d.; Gao, Q.; Gao, X. . l.; Gao, Y.; Gao, Z.; Garzia, Isabella; Goetzen, K.; Gong, L.; Gong, W. . x.; Gradl, W.; Greco, M.; Gu, M. . h.; Gu, Y. . t.; Guan, Y. . h.; Guo, A. . q.; Guo, L. . b.; Guo, R. . p.; Guo, Y.; Guo, Y. . p.; Haddadi, Z.; Hafner, A.; Han, S.; Hao, X. . q.; Harris, F. . a.; He, K. . l.; Heinsius, F. . h.; Held, T.; Heng, Y. . k.; Holtmann, T.; Hou, Z. . l.; Hu, C.; Hu, H. . m.; Hu, T.; Hu, Y.; Huang, G. . s.; Huang, J. . s.; Huang, X. . t.; Huang, X. . z.; Huang, Z. . l.; Hussain, T.; Ikegami Andersson, W.; Ji, Q.; Ji, Q. . p.; Ji, X. . b.; Ji, X. . l.; Jiang, L. . w.; Jiang, X. . s.; Jiang, X. . y.; Jiao, J. . b.; Jiao, Z.; Jin, D. . p.; Jin, S.; Johansson, T.; Julin, A.; Kalantar Nayestanaki, N.; Kang, X. . l.; Kang, X. . s.; Kavatsyuk, M.; Ke, B. . c.; Kiese, P.; Kliemt, R.; Kloss, B.; Kolcu, O. . b.; Kopf, B.; Kornicer, M.; Kupsc, A.; Kühn, W.; Lange, J. . s.; Lara, M.; Larin, P.; Leithoff, H.; Leng, C.; Li, C.; Li, Cheng; Li, D. . m.; Li, F.; Li, F. . y.; Li, G.; Li, H. . b.; Li, H. . j.; Li, J. . c.; Li, Jin; Li, Kang; Li, Ke; Li, Lei; Li, P. . r.; Li, Q. . y.; Li, T.; Li, W. . d.; Li, W. . g.; Li, X. . l.; Li, X. . n.; Li, X. . q.; Li, Y. . b.; Li, Z. . b.; Liang, H.; Liang, Y. . f.; Liang, Y. . t.; Liao, G. . r.; Lin, D. . x.; Liu, B.; Liu, B. . j.; Liu, C. . x.; Liu, D.; Liu, F. . h.; Liu, Fang; Liu, Feng; Liu, H. . b.; Liu, H. . m.; Liu, Huanhuan; Liu, Huihui; Liu, J.; Liu, J. . b.; Liu, J. . p.; Liu, J. . y.; Liu, K.; Liu, K. . y.; Liu, L. . d.; Liu, P. . l.; Liu, Q.; Liu, S. . b.; Liu, X.; Liu, Y. . b.; Liu, Y. . y.; Liu, Z. . a.; Liu, Zhiqing; Loehner, H.; Long, Y. . f.; Lou, X. . c.; Lu, H. . j.; Lu, J. . g.; Lu, Y.; Lu, Y. . p.; Luo, C. . l.; Luo, M. . x.; Luo, T.; Luo, X. . l.; Lyu, X. . r.; Ma, F. . c.; Ma, H. . l.; Ma, L. . l.; Ma, M. . m.; Ma, Q. . m.; Ma, T.; Ma, X. . n.; Ma, X. . y.; Ma, Y. . m.; Maas, F. . e.; Maggiora, M.; Malik, Q. . a.; Mao, Y. . j.; Mao, Z. . p.; Marcello, S.; Messchendorp, J. . g.; Mezzadri, Giulio; Min, J.; Min, T. . j.; Mitchell, R. . e.; Mo, X. . h.; Mo, Y. . j.; Morales Morales, C.; Muchnoi, N. . y. u.; Muramatsu, H.; Musiol, P.; Nefedov, Y.; Nerling, F.; Nikolaev, I. . b.; Ning, Z.; Nisar, S.; Niu, S. . l.; Niu, X. . y.; Olsen, S. . l.; Ouyang, Q.; Pacetti, S.; Pan, Y.; Papenbrock, M.; Patteri, P.; Pelizaeus, M.; Peng, H. . p.; Peters, K.; Pettersson, J.; Ping, J. . l.; Ping, R. . g.; Poling, R.; Prasad, V.; Qi, H. . r.; Qi, M.; Qian, S.; Qiao, C. . f.; Qin, L. . q.; Qin, N.; Qin, X. . s.; Qin, Z. . h.; Qiu, J. . f.; Rashid, K. . h.; Redmer, C. . f.; Ripka, M.; Rong, G.; Rosner, C. h.; Ruan, X. . d.; Sarantsev, A.; Savrié, M.; Schnier, C.; Schoenning, K.; Shan, W.; Shao, M.; Shen, C. . p.; Shen, P. . x.; Shen, X. . y.; Sheng, H. . y.; Song, W. . m.; Song, X. . y.; Sosio, S.; Spataro, S.; Sun, G. . x.; Sun, J. . f.; Sun, S. . s.; Sun, X. . h.; Sun, Y. . j.; Sun, Y. . z.; Sun, Z. . j.; Sun, Z. . t.; Tang, C. . j.; Tang, X.; Tapan, I.; Thorndike, E. . h.; Tiemens, M.; Uman, I.; Varner, G. . s.; Wang, B.; Wang, B. . l.; Wang, D.; Wang, D. . y.; Wang, K.; Wang, L. . l.; Wang, L. . s.; Wang, M.; Wang, P.; Wang, P. . l.; Wang, W.; Wang, W. . p.; Wang, X. . f.; Wang, Y.; Wang, Y. . d.; Wang, Y. . f.; Wang, Y. . q.; Wang, Z.; Wang, Z. . g.; Wang, Z. . h.; Wang, Z. . y.; Wang, Zongyuan; Weber, T.; Wei, D. . h.; Weidenkaff, P.; Wen, S. . p.; Wiedner, U.; Wolke, M.; Wu, L. . h.; Wu, L. . j.; Wu, Z.; Xia, L.; Xia, L. . g.; Xia, Y.; Xiao, D.; Xiao, H.; Xiao, Z. . j.; Xie, Y. . g.; Xie, Y. . h.; Xiu, Q. . l.; Xu, G. . f.; Xu, J. . j.; Xu, L.; Xu, Q. . j.; Xu, Q. . n.; Xu, X. . p.; Yan, L.; Yan, W. . b.; Yan, W. . c.; Yan, Y. . h.; Yang, H. . j.; Yang, H. . x.; Yang, L.; Yang, Y. . x.; Ye, M.; Ye, M. . h.; Yin, J. . h.; You, Z. . y.; Yu, B. . x.; Yu, C. . x.; Yu, J. . s.; Yuan, C. . z.; Yuan, Y.; Yuncu, A.; Zafar, A. . a.; Zeng, Y.; Zeng, Z.; Zhang, B. . x.; Zhang, B. . y.; Zhang, C. . c.; Zhang, D. . h.; Zhang, H. . h.; Zhang, H. . y.; Zhang, J.; Zhang, J. . j.; Zhang, J. . l.; Zhang, J. . q.; Zhang, J. . w.; Zhang, J. . y.; Zhang, J. . z.; Zhang, K.; Zhang, L.; Zhang, S. . q.; Zhang, X. . y.; Zhang, Y. . h.; Zhang, Y. . n.; Zhang, Y. . t.; Zhang, Yang; Zhang, Yao; Zhang, Yu; Zhang, Z. . h.; Zhang, Z. . p.; Zhang, Z. . y.; Zhao, G.; Zhao, J. . w.; Zhao, J. . y.; Zhao, J. . z.; Zhao, Lei; Zhao, Ling; Zhao, M. . g.; Zhao, Q.; Zhao, Q. . w.; Zhao, S. . j.; Zhao, T. . c.; Zhao, Y. . b.; Zhao, Z. . g.; Zhemchugov, A.; Zheng, B.; Zheng, J. . p.; Zheng, W. . j.; Zheng, Y. . h.; Zhong, B.; Zhou, L.; Zhou, X.; Zhou, X. . k.; Zhou, X. . r.; Zhou, X. . y.; Zhu, K.; Zhu, K. . j.; Zhu, S.; Zhu, S. . h.; Zhu, X. . l.; Zhu, Y. . c.; Zhu, Y. . s.; Zhu, Z. . a.; Zhuang, J.; Zotti, L.; Zou, B. . s.; Zou, J. . h. | |
| Rivista: | PHYSICAL REVIEW D | |
| Keywords: | PI-PI, radiative corrections, charmonium | |
| Abstract in inglese: | We study the process e+e- → pi+pi-ψ(3686) using 5.1 fb−1 of data collected at 16 center-of-mass energy ( sqrt(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− → pi+pi−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 pm 7.4 pm 1.4 MeV/c2 andΓ=80.1 pm 24.6 pm 2.9MeV,and the second has M=4383.8 pm 4.2 pm 0.8 MeV/c2 and Γ = 84.2 pm 12.5 pm 2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e+e− → pi+pi−ψ(3686) for the first time with a statistical significance of 5.8 sigma. A charged charmoniumlike structure is observed in the π(+-)ψ(3686) invariant mass spectrum for data at sqrt(s) = 4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M = 4032.1 pm 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. | |
| Digital Object Identifier (DOI): | 10.1103/PhysRevD.96.032004 | |
| Handle: | http://hdl.handle.net/11392/2375842 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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