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Achasov, M N; Albrecht, M; An, Q; Ferroli, R Baldini; Bianchi, F; Boger, E; Chen, M L; Dbeyssi, A; Dedovich, D; Deng, Z Y; Denysenko, I; De Mori, F; Dong, J; Du, S X; Fan, J Z; Fang, Y; Farinelli, R; Felici, G; Gao, X L; Gao, Y; Garzia, I; Gradl, W; Gu, Y T; Haddadi, Z; Heng, Y K; Hu, C; Hu, T; Hussain, T; Ji, X B; Kalantar-Nayestanaki, N; Kopf, B; Kühn, W; Li, D M; Li, F; Li, H B; Li, Lei; Li, Q Y; Li, W G; Li, X L; Li, X Q; Liang, H; Liu, F H; Liu, Feng; Liu, H H; Liu, J Y; Liu, P L; Liu, Y Y; Luo, M X; Ma, H L; Ma, X N; Ma, X Y; Malik, Q A; Nikolaev, I B; Nisar, S; Ouyang, Q; Pacetti, S; Pettersson, J; Ping, J L; Poling, R; Ruan, X D; Schoenning, K; Shan, W; Shen, C P; Shen, X Y; Song, W M; Song, X Y; Sun, X H; Sun, Z J; Tang, X; Varner, G S; Wang, B; Wang, B L; Wang, D; Wang, L L; Wang, L S; Wang, X F; Wang, Y; Wang, Y F; Wen, S P; Wiedner, U; Xia, L; Xia, Y; Xiao, H; Xie, Y G; Xu, X P; Yan, Y H; Ye, M; Zallo, A; Zhang, B Y; Zhang, C; Zhang, H Y; Zhang, J Q; Zhang, K; Zhang, S Q; Zhang, Y H; Zhang, Z H; Zhao, Ling; Zhao, M G; Zhou, X Y; Zhu, X L
Physical review letters, 2018-Jun-15, Letnik: 120, Številka: 24Journal Article
Using a low background data sample of 9.7×10^{5} J/ψ→γη^{'}, η^{'}→γπ^{+}π^{-} events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of η^{'}→γπ^{+}π^{-} are studied with both model-dependent and model-independent approaches. The contributions of ω and the ρ(770)-ω interference are observed for the first time in the decays η^{'}→γπ^{+}π^{-} in both approaches. Additionally, a contribution from the box anomaly or the ρ(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.
