Amplitude Analysis of the Decays η' → π+π-π0 and η' → π0π0π0

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...

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Veröffentlicht in:	Physical review letters 2017-01, Vol.118 (1)
Hauptverfasser:	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.
Format:	Artikel
Sprache:	eng
Schlagworte:	NUCLEAR PHYSICS AND RADIATION PHYSICS
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Beschreibung
Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.118.012001