Search for the $X(2370)$ and observation of $η_{c}\toηηη^\prime$ in $J/ψ\toγηηη^{\prime}$
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Ahmed, S.
name: Albrecht, M.
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name: Chen, M. L.
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name: Cheng, W. S.
name: Cibinetto, G.
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name: Dong, M. Y.
name: Du, S. X.
name: Fang, J.
name: Fang, S. S.
name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Fritsch, M.
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name: Gao, X. L.
name: Gao, Y.
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name: Gao, Y.
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name: Garzia, I.
name: Gersabeck, E. M.
name: Gilman, A.
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name: Gradl, W.
name: Greco, M.
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name: Guo, R. P.
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name: Guskov, A.
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name: Harris, F. A.
name: Hüsken, N.
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name: Liu, Fang
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name: Liu, H. M.
name: Liu, Huanhuan
name: Liu, Huihui
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name: Mezzadri, G.
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name: Yang, Y. H.
name: Yang, Y. X.
name: Yang, Yifan
name: Yang, Zhi
name: Ye, M.
name: Ye, M. H.
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name: Yu, B. X.
name: Yu, C. X.
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name: Yuan, W.
name: Yuan, X. Q.
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name: Yuan, Z. Y.
name: Yue, C. X.
name: Yuncu, A.
name: Zafar, A. A.
name: Zeng, Y.
name: Zhang, B. X.
name: Zhang, Guangyi
name: Zhang, H.
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name: Zhang, J. W.
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name: Zhang, J. Z.
name: Zhang, Jianyu
name: Zhang, Jiawei
name: Zhang, Lei
name: Zhang, S.
name: Zhang, S. F.
name: Zhang, T. J.
name: Zhang, X. Y.
name: Zhang, Y.
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name: Zhang, Yan
name: Zhang, Yao
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name: Zhao, G.
name: Zhao, J.
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name: Zhao, Lei
name: Zhao, Ling
name: Zhao, M. G.
name: Zhao, Q.
name: Zhao, S. J.
name: Zhao, Y. B.
name: Zhao, Y. X.
name: Zhao, Z. G.
name: Zhemchugov, A.
name: Zheng, B.
name: Zheng, J. P.
name: Zheng, Y.
name: Zheng, Y. H.
name: Zhong, B.
name: Zhong, C.
name: Zhou, L. P.
name: Zhou, Q.
name: Zhou, X.
name: Zhou, X. K.
name: Zhou, X. R.
name: Zhu, A. N.
name: Zhu, J.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S. H.
name: Zhu, W. J.
name: Zhu, Y. C.
name: Zhu, Z. A.
name: Zou, B. S.
name: Zou, J. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using a sample of $1.31\times10^{9} ~J/ψ$ events collected with the BESIII detector, we perform a study of $J/ψ\toγηηη^{\prime}$ to search for the $X(2370)$ and $η_{c}$ in the $ηηη^{\prime}$ invariant mass distribution. No significant signal for the $X(2370)$ is observed, and we set an upper limit for the product branching fraction of ${\cal B}(J/ψ\toγX(2370)\cdot{\cal B}(X(2370)\toηηη^{\prime}) &lt; 9.2\times10^{-6}$ at the 90% confidence level. A clear $η_{c}$ signal is observed for the first time, yielding a product branching fraction of ${\cal B}(J/ψ\to γη_{c})\cdot{\cal B}(η_{c}\to ηηη^{\prime}) = (4.86\pm0.62~({\rm stat.})\pm0.45~({\rm sys.}))\times10^{-5}$.
description: arXiv admin note: text overlap with arXiv:1912.11253