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  • Observation of $\psi(3686) \to \eta' e^+ e^-
    Achasov, M. N; An, Q; Bai, J. Z; Berger, N; Bertani, M; Bettoni, D; Briere, R. A; Cai, H; Chang, J. F; Chen, J. C; Dbeyssi, A; Dou, Z. L; Fava, L; Felici, G; Gao, Y; Gao, Y. G; Gilman, A; Gong, L; Gradl, W; Guo, R. P; Haddadi, Z; Harris, F. A; Heng, Y. K; Hou, Z. L; Hu, T; Huang, J. S; Hussain, T; Ji, Q; Jiang, X. Y; Jin, D. P; Kiese, P; Kurth, M; Kühn, W; Leithoff, H; Li, G; Li, J. C; Li, J. W; Li, Kang; Liang, Y. T; Liu, H. B; Liu, K. Y; Liu, Ke; Lu, H. J; Lu, J. G; Lu, Y; Lu, Y. P; Lyu, X. R; Ma, L. L; Ma, Q. M; Ma, T; Ma, Y. M; Marcello, S; Mitchell, R. E; Morales, C. Morales; Nefedov, Y; Niu, X. Y; Pacetti, S; Pelizaeus, M; Pellegrino, J; Qi, T. . Y; Shan, W; Shen, P. X; Shen, X. Y; Shi, X; Spataro, S; Sun, L; Sun, S. S; Sun, Y. K; Sun, Z. J; Tang, C. J; Tang, G. Y; Wang, Dan; Wang, P; Wang, P. L; Wang, X. F; Wei, D. H; Wu, L. H; Xiao, Y. J; Yang, H. X; Yang, Y. X; Yang, Z. Q; Ye, M. H; Yu, C. X; Yuan, C. Z; Yuan, Y; Zafar, A. A; Zhang, Z. P; Zhao, G; Zhemchugov, A; Zheng, Y. H; Zhong, B; Zhou, L; Zhou, Q; Zhou, X. Y; Zhou, Xiaoyu; Zhu, J; Zhu, S; Zhu, Y. S; Zhu, Z. A; Zou, B. S

    03/2018
    Journal Article

    Phys. Lett. B 783 (2018) 452-458 Using a data sample of $448.1 \times 10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay $\psi(3686) \to \eta' e^+ e^-$, with significances of 7.0$\sigma$ and 6.3$\sigma$ when reconstructing the $\eta'$ meson via its decay modes $\eta'\to\gamma \pi^+ \pi^-$ and $\eta'\to\pi^+\pi^-\eta$ ($\eta \to \gamma\gamma$), respectively. The weighted average branching fraction is determined to be $\mathcal{B}(\psi(3686) \to \eta' e^+ e^-)= (1.90 \pm 0.25 \pm 0.11) \times 10^{-6}$, where the first uncertainty is statistical and the second systematic.

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