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Ai, X. C.; Albayrak, O.; Bian, J. M.; Bianchi, F.; Boyko, I.; Briere, R. A.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chen, S. J.; Deng, Z. Y.; Dou, Z. L.; Fang, X.; Fang, Y.; Fava, L.; Fedorov, O.; Fioravanti, E.; Fu, C. D.; Gao, Q.; Guan, Y. H.; Guo, R. P.; Guo, Y.; Hafner, A.; Hu, H. M.; Hu, T.; Ji, Q. P.; Ji, X. B.; Kang, X. L.; Lange, J. S.; Larin, P.; Li, W. D.; Li, W. G.; Liang, H.; Lin, D. X.; Liu, F. H.; Liu, Feng; Liu, H. B.; Liu, H. H.; Liu, K.; Liu, Y. B.; Loehner, H.; Lu, Y. P.; Ma, M. M.; Ma, X. Y.; Maggiora, M.; Mo, Y. J.; Muchnoi, N. Yu; Nefedov, Y.; Nisar, S.; Olsen, S. L.; Pacetti, S.; Pan, Y.; Patteri, P.; Peng, H. P.; Prasad, V.; Ripka, M.; Shan, W.; Shao, M.; Song, W. M.; Song, X. Y.; Sun, X. H.; Sun, Y. J.; Sun, Y. Z.; Sun, Z. J.; Sun, Z. T.; Wang, L. S.; Wang, M.; Wang, W. P.; Wang, X. F.; Wang, Y.; Wang, Y. F.; Wolke, M.; Wu, L. J.; Wu, Z.; Xia, Y.; Xiao, D.; Xu, Q. J.; Yang, Y. X.; Yu, C. X.; Yu, J. S.; Yuan, C. Z.; Yuan, W. L.; Zafar, A. A.; Zeng, Y.; Zhang, B. X.; Zhang, D. H.; Zhang, H. H.; Zhang, J. J.; Zhang, K.; Zhang, X. Y.; Zhang, Y.; Zhang, Yu; Zhao, M. G.; Zhao, Q.; Zhao, Q. W.; Zhao, T. C.; Zheng, B.; Zheng, Y. H.; Zhu, X. L.; Zhu, Z. A.
Physical review letters, 01/2017, Letnik: 118, Številka: 1Journal Article
Based on a sample of 1.31 × 109J / ψ events collected with the BESIII detector, an amplitude analysis of the isospin-violating decays η'→ π + π - π 0 and η' → π 0 π 0 π 0 is performed. A significant P-wave contribution from η'→ ρ ± π ∓ is observed for the first time in η' → π + π - π 0 . The branching fraction is determined to be B ( η'→ ρ ± π ∓ ) = ( 7.44 ± 0.60 ± 1.26 ± 1.84 ) × 10-4, where the first uncertainty is statistical, the second systematic, and the third model dependent. In addition to the nonresonant S -wave component, there is a significant σ meson component. The branching fractions of the combined S -wave components are determined to be B ( η' → π + π - π 0 ) S = ( 37.63 ± 0.77 ± 2.22 ± 4.48 ) × 10-4 and B ( η' → π 0 π 0 π 0 ) = ( 35.22 ± 0.82 ± 2.54 ) × 10-4, respectively. Finally, the latter one is consistent with previous BESIII measurements.
