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Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Begzsuren, K.; Bettoni, D.; Bianchi, F.; Bloms, J.; Briere, R. A.; Cai, X.; Calcaterra, A.; Chelkov, G.; Chen, G.; Chen, S. J.; Cheng, W. S.; Dbeyssi, A.; Fan, Y. L.; Fang, S. S.; Fava, L.; Geng, C.; Guo, Y. P.; Hao, X. Q.; Heinz, C. H.; Held, T.; Herold, C.; Holtmann, T.; Hu, J. F.; Irshad, M.; Ke, B. C.; Khoukaz, A.; Koch, L.; Kopf, B.; Kühn, W.; Lange, J. S.; Lavezzi, L.; Lei, Z. H.; Li, Ke; Li, L. K.; Liang, H.; Libby, J.; Lin, C. X.; Liu, Fang; Liu, H. M.; Liu, Huanhuan; Liu, Huihui; Liu, J. B.; Liu, J. L.; Liu, J. Y.; Liu, K.; Liu, L.; Liu, M. H.; Liu, W. M.; Lu, J. D.; Lu, Y.; Luo, X. L.; Lyu, X. R.; Ma, F. C.; Ma, M. M.; Ma, Q. M.; Mao, Y. J.; Muramatsu, H.; Nefedov, Y.; Ouyang, Q.; Pan, Y.; Qiao, C. F.; Rodin, V.; Rolo, M.; Rump, M.; Schnier, C.; Shan, X. Y.; Su, K. X.; Sui, F. F.; Sun, S. S.; Sun, X.; Tang, G. Y.; Tang, J.; Tian, Y. T.; Wang, B.; Wang, L. L.; Wang, W. P.; Wang, X. F.; Wang, Y. F.; Wiedner, U.; Wollenberg, L.; Wu, L. J.; Wu, Z.; Xia, L.; Xie, Y. G.; Yang, Yifan; Yu, J. S.; Yuncu, A.; Zafar, A. A.; Zhang, H. Y.; Zhang, Jianyu; Zhang, Jiawei; Zhang, S. F.; Zhang, Z. Y.; Zhao, Z. G.; Zhong, B.; Zhou, L. P.; Zou, J. H.
Physical review. D, 10/2021, Volume: 104, Issue: 7Journal Article
The decay $D^+_s$ → $π^+π^+π^-η$ is observed for the first time, using e+e- collision data corresponding to an integrated luminosity of 6.32 fb-1 collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be $\mathscr{B}$($D^+_s$ → $π^+π^+π^-η$) = (3.12 ± 0.13stat ± 0.90syst)%. The first amplitude analysis of this decay reveals the substructures in $D^+_s$ → $π^+π^+π^-η$ nd determines the relative fractions and the phases among these substructures. The dominant intermediate process is $D^+_s$ → $a_1$(1260)+$η,a_1$(1260)+ → ρ(770)0$π^+$ with a branching fraction of (1.73 ± 0.14stat ±0.08syst)%. We also observe the W-annihilation process $D^+_s$ → $a_0$(980)+ ρ(770)0, $a_0$(980)+ → $π^+η$ with a branching fraction of (0.21 ± 0.08stat ± 0.05syst)%, which is larger than the branching fractions of other measured pure W-annihilation decays by 1 order of magnitude.
