Observation of $ψ(3686) \to η' e^+ e^- $
Creators: name: Ablikim, M.
name: Achasov, M. N.
name: Ahmed, S.
name: Albrecht, M.
name: Alekseev, M.
name: Amoroso, A.
name: An, F. F.
name: An, Q.
name: Bai, J. Z.
name: Bai, Y.
name: Bakina, O.
name: Ferroli, R. Baldini
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name: Begzsuren, K.
name: Bennett, D. W.
name: Bennett, J. V.
name: Berger, N.
name: Bertani, M.
name: Bettoni, D.
name: Bianchi, F.
name: Boger, E.
name: Boyko, I.
name: Briere, R. A.
name: Cai, H.
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name: Cakir, O.
name: Calcaterra, A.
name: Cao, G. F.
name: Cetin, S. A.
name: Chai, J.
name: Chang, J. F.
name: Chelkov, G.
name: Chen, G.
name: Chen, H. S.
name: Chen, J. C.
name: Chen, M. L.
name: Chen, P. L.
name: Chen, S. J.
name: Chen, X. R.
name: Chen, Y. B.
name: Cheng, W.
name: Chu, X. K.
name: Cibinetto, G.
name: Cossio, F.
name: Dai, H. L.
name: Dai, J. P.
name: Dbeyssi, A.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
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name: Destefanis, M.
name: De Mori, F.
name: Ding, Y.
name: Dong, C.
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name: Dong, L. Y.
name: Dong, M. Y.
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name: Du, S. X.
name: Duan, P. F.
name: Fang, J.
name: Fang, S. S.
name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Fegan, S.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Fioravanti, E.
name: Fritsch, M.
name: Fu, C. D.
name: Gao, Q.
name: Gao, X. L.
name: Gao, Y.
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name: Gao, Z.
name: Garillon, B.
name: Garzia, I.
name: Gilman, A.
name: Goetzen, K.
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name: Guo, R. P.
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name: Guskov, A.
name: Haddadi, Z.
name: Han, S.
name: Hao, X. Q.
name: Harris, F. A.
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name: Heinsius, F. H.
name: Held, T.
name: Heng, Y. K.
name: Holtmann, T.
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name: Zhang, K.
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name: Zhang, T. J.
name: Zhang, X. Y.
name: Zhang, Y.
name: Zhang, Y. H.
name: Zhang, Y. T.
name: Zhang, Yang
name: Zhang, Yao
name: Zhang, Yu
name: Zhang, Z. H.
name: Zhang, Z. P.
name: Zhang, Z. Y.
name: Zhao, G.
name: Zhao, J. W.
name: Zhao, J. Y.
name: Zhao, J. Z.
name: Zhao, Lei
name: Zhao, Ling
name: Zhao, M. G.
name: Zhao, Q.
name: Zhao, S. J.
name: Zhao, T. C.
name: Zhao, Y. B.
name: Zhao, Z. G.
name: Zhemchugov, A.
name: Zheng, B.
name: Zheng, J. P.
name: Zheng, Y. H.
name: Zhong, B.
name: Zhou, L.
name: Zhou, Q.
name: Zhou, X.
name: Zhou, X. K.
name: Zhou, X. R.
name: Zhou, X. Y.
name: Zhou, Xiaoyu
name: Zhou, Xu
name: Zhu, A. N.
name: Zhu, J.
name: Zhu, J.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S.
name: Zhu, S. H.
name: Zhu, X. L.
name: Zhu, Y. C.
name: Zhu, Y. S.
name: Zhu, Z. A.
name: Zhuang, J.
name: Zou, B. S.
name: Zou, J. H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using a data sample of $448.1 \times 10^6$ $ψ(3686)$ events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay $ψ(3686) \to η' e^+ e^-$, with significances of 7.0$σ$ and 6.3$σ$ when reconstructing the $η'$ meson via its decay modes $η'\toγπ^+ π^-$ and $η'\toπ^+π^-η$ ($η\to γγ$), respectively. The weighted average branching fraction is determined to be $\mathcal{B}(ψ(3686) \to η' e^+ e^-)= (1.90 \pm 0.25 \pm 0.11) \times 10^{-6}$, where the first uncertainty is statistical and the second systematic.
description: 10 pages, 3 figures