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  • Observation of the hindered electromagnetic Dalitz decay $\psi(3686) \to e^+ e^- \eta_c
    Ablikim, M; Achasov, M. N; An, M. R; An, Q; Bai, Y; Bertani, M; Bettoni, D; Bianchi, F; Bloms, J; Bortone, A; Briere, R. A; Cao, G. F; Cetin, S. A; Chen, C; Chen, S. M; Chen, X. R; Cheng, W. S; Choi, S. K; Denysenko, I; Feng, C. Q; Ge, P. T; Geng, C; He, K. L; Herold, C; Jaeger, S; Jiang, X. S; Jiang, Y; Jiao, J. B; Ke, B. C; Khoukaz, A; Kuessner, M; Kühn, W; Li, C; Li, Cheng; Li, H. B; Li, H. N; Li, Ke; Liu, G. M; Liu, Huihui; Liu, Q; Liu, T; Liu, Y; Liu, Z. A; Lyu, Y. F; Ma, H. L; Maas, F. E; Meng, Z. X; Mezzadri, G; Olsen, S. L; Pacetti, S; Pelizaeus, M; Peters, K; Ping, R. G; Prasad, V; Qi, H; Qian, W. B; Qin, X. P; Rolo, M; Schelhaas, Y; Shan, K. Y; Shi, Q. Q; Sun, H; Sun, Y. J; Tan, Y. H; Tao, Q. T; Teng, J. X; Wang, C. W; Wang, D. Y; Wang, L. L; Wang, Meng; Wang, W; Wang, Y. H; Wang, Y. Q; Wang, Yaqian; Wiedner, U; Wu, X; Wu, X. H; Xiang, T; Xie, Y. H; Xie, Z. P; Yang, H. L; Yang, L; Yang, Yifan; Ye, M; Yin, J. H; Yu, C. X; Yu, T; Yuan, C. Z; Yuan, X. Q; Zafar, A. A; Zeng, F. R; Zhang, H; Zhang, J. Q; Zhang, Y; Zhao, J. Y; Zhao, Y. B; Zhou, L. P; Zhu, K. J; Zhu, S. H; Zhu, Y. C

    arXiv (Cornell University), 08/2022
    Journal Article

    Phys. Rev. D 106, 112002 (2022) Using a data sample of $(448.1 \pm 2.9)\times10^6 ~\psi(3686)$ decays collected at an $e^+ e^-$ center-of-mass energy of $3.686~\rm{GeV}$ by the BESIII detector at BEPCII, we report an observation of the hindered electromagnetic Dalitz decay $\psi(3686) \to e^+ e^- \eta_c$ with a significance of $7.9\sigma$. The branching fraction is determined to be $\mathcal{B} (\psi(3686) \to e^+ e^- \eta_c) = (3.77 \pm 0.40_{\rm stat.} \pm 0.18_{\rm syst.})\times 10^{-5}$, agreeing well with the prediction of the vector meson dominance model. This is the first measurement of the electromagnetic Dalitz transition between the $\psi(3686)$ and the $\eta_c$, which provides new insight into the electromagnetic properties of this decay, and offers new opportunities to measure the absolute branching fractions of $\eta_c$ decays.

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