Observation of the $ψ(1^3D_2)$ state in $e^+e^-\toπ^+π^-γχ_{c1}$ at BESIII
Creators: name: Ablikim, M.
name: Achasov, M. N.
name: Ai, X. C.
name: Albayrak, O.
name: Albrecht, M.
name: Ambrose, D. J.
name: Amoroso, A.
name: An, F. F.
name: An, Q.
name: Bai, J. Z.
name: Ferroli, R. Baldini
name: Ban, Y.
name: Bennett, D. W.
name: Bennett, J. V.
name: Bertani, M.
name: Bettoni, D.
name: Bian, J. M.
name: Bianchi, F.
name: Boger, E.
name: Bondarenko, O.
name: Boyko, I.
name: Briere, R. A.
name: Cai, H.
name: Cai, X.
name: Cakir, O.
name: Calcaterra, A.
name: Cao, G. F.
name: Cetin, S. A.
name: Chang, J. F.
name: Chelkov, G.
name: Chen, G.
name: Chen, H. S.
name: Chen, H. Y.
name: Chen, J. C.
name: Chen, M. L.
name: Chen, S. J.
name: Chen, X.
name: Chen, X. R.
name: Chen, Y. B.
name: Cheng, H. P.
name: Chu, X. K.
name: Cibinetto, G.
name: Cronin-Hennessy, D.
name: Dai, H. L.
name: Dai, J. P.
name: Dbeyssi, A.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
name: Denysenko, I.
name: Destefanis, M.
name: De Mori, F.
name: Ding, Y.
name: Dong, C.
name: Dong, J.
name: Dong, L. Y.
name: Dong, M. Y.
name: Du, S. X.
name: Duan, P. F.
name: Fan, J. Z.
name: Fang, J.
name: Fang, S. S.
name: Fang, X.
name: Fang, Y.
name: Fava, L.
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, Y.
name: Gao, Z.
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name: Geng, C.
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name: Gong, W. X.
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name: Greco, M.
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name: Haddadi, Z.
name: Hafner, A.
name: Han, S.
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name: Jin, S.
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name: Julin, A.
name: Kalantar-Nayestanaki, N.
name: Kang, X. L.
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name: Kavatsyuk, M.
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name: Kliemt, R.
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name: Li, Cheng
name: Li, D. M.
name: Li, F.
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name: Li, Jin
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name: Liu, K. Y.
name: Liu, L. D.
name: Liu, P. L.
name: Liu, Q.
name: Liu, S. B.
name: Liu, X.
name: Liu, X. X.
name: Liu, Y. B.
name: Liu, Z. A.
name: Liu, Zhiqiang
name: Liu, Zhiqing
name: Loehner, H.
name: Lou, X. C.
name: Lu, H. J.
name: Lu, J. G.
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name: Rong, G.
name: Ruan, X. D.
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name: Shao, M.
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name: Varner, G. S.
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name: Zhang, H. Y.
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name: Zhang, J. L.
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name: Zhang, X. Y.
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name: Zhang, Y. H.
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name: Zhao, J. W.
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name: Zhao, J. Z.
name: Zhao, Lei
name: Zhao, Ling
name: Zhao, M. G.
name: Zhao, Q.
name: Zhao, Q. W.
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, W. J.
name: Zheng, Y. H.
name: Zhong, B.
name: Zhou, L.
name: Zhou, Li
name: Zhou, X.
name: Zhou, X. K.
name: Zhou, X. R.
name: Zhou, X. Y.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S.
name: Zhu, X. L.
name: Zhu, Y. C.
name: Zhu, Y. S.
name: Zhu, Z. A.
name: Zhuang, J.
name: Zotti, L.
name: Zou, B. S.
name: Zou, J. H.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report the observation of the $X(3823)$ in the process $e^+e^-\to π^+π^-X(3823) \to π^+π^-γχ_{c1}$ with a statistical significance of $6.2σ$, in data samples at center-of-mass energies $\sqrt{s}=$4.230, 4.260, 4.360, 4.420 and 4.600~GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the $X(3823)$ is $(3821.7\pm 1.3\pm 0.7)$~MeV/$c^2$, where the first error is statistical and the second systematic, and the width is less than $16$~MeV at the 90\% confidence level. The products of the Born cross sections for $e^+e^-\to π^+π^-X(3823)$ and the branching ratio $\mathcal{B}[X(3823)\to γχ_{c1,c2}]$ are also measured. These measurements are in good agreement with the assignment of the $X(3823)$ as the $ψ(1^3D_2)$ charmonium state.
description: 7 pages, 3 figures, version to appear in Phys. Rev. Lett