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Ai, X. C.; Amoroso, A.; Calcaterra, A.; Chen, G.; Chen, H. S.; Cibinetto, G.; Coen, S. C.; Dai, J. P.; Dbeyssi, A.; De Mori, F.; Dong, J.; Feldbauer, F.; Feng, C. Q.; Fu, Y. W.; Garbolino, S.; Greco, M.; Heinz, C. H.; Hou, Z. L.; Hu, J. F.; Ji, Q. P.; Ji, X. B.; Jiang, Y.; Kavatsyuk, M.; Leithoff, H.; Lellmann, M.; Li, H. J.; Li, J. R.; Li, J. S.; Li, L. K.; Li, Q. X.; Li, X. L.; Li, Z. J.; Liao, Y. P.; Liu, B. J.; Liu, Huanhuan; Liu, Huihui; Liu, Ke; Liu, P. L.; Lou, X. C.; Lu, X. L.; Lyu, Y. F.; Ma, H.; Ma, L. L.; Ma, Y.; Malde, S.; Malik, Q. A.; Mao, Z. P.; Marcello, S.; Ning, Z.; Pacetti, S.; Patteri, P.; Peng, H. P.; Peng, Y. Y.; Ping, J. L.; Ping, R. G.; Qi, M.; Qi, T. Y.; Qian, S.; Shan, K. Y.; Shan, X. Y.; Sun, G. X.; Sun, Y. Z.; Tao, Q. T.; Tian, W. H.; Tian, W. H.; Wang, S. J.; Wang, Meng; Wang, N. Y.; Wang, S.; Wang, W.; Wang, Y. N.; Wang, Z.; Xiao, Y. L.; Xie, C.; Xie, X. H.; Xie, Y. G.; Xu, G. F.; Yang, H. J.; Yang, Y.; Yao, Z. P.; Yu, T.; Yuan, Y.; Yuan, Z. Y.; Yue, C. X.; Zafar, A. A.; Zhai, Y. C.; Zhan, Y. H.; Zhang, H. Q.; Zhang, J.; Zhang, Y.; Zhang, Y. T.; Zhang, Z. H.; Zhao, Lei; Zhao, R. P.; Zhao, S. J.; Zhao, Y. X.; Zhou, H.; Zhu, J.; Zhu, L. X.; Zhu, Z. A.
Physical review. D, 08/2024, Volume: 110, Issue: 3Journal Article
With the data samples taken at center-of-mass energies from 2.00 to 3.08 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis on the e + e − → π + π − π 0 process is performed. The Born cross sections for e + e − → π + π − π 0 and its intermediate processes e + e − → ρ π and ρ ( 1450 ) π are measured as functions of s . The results for e + e − → π + π − π 0 are consistent with previous results measured with the initial state radiation method within one standard deviation, and improve the uncertainty by a factor of ten. By fitting the line shapes of the Born cross sections for the e + e − → ρ π and e + e − → ρ ( 1450 ) π , a structure with mass M = 2119 ± 11 ± 15 MeV / c 2 and width Γ = 69 ± 30 ± 5 MeV is observed with a significance of 5.9 σ , where the first uncertainties are statistical and the second ones are systematic. This structure can be interpreted as an excited ω state. Published by the American Physical Society 2024
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