Observation of the decay $X(3872) \to π^0 χ_{c1}(1P)$
Creators: name: BESIII Collaboration
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, Y.
name: Bakina, O.
name: Ferroli, R. Baldini
name: Ban, Y.
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name: Bennett, J. V.
name: Berger, N.
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name: Bettoni, D.
name: Bianchi, F.
name: Bloms, J.
name: Boyko, I.
name: Briere, R. A.
name: Cai, H.
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name: Calcaterra, A.
name: Cao, G. F.
name: Cao, N.
name: Cetin, S. A.
name: Chai, J.
name: Chang, J. F.
name: Chang, W. L.
name: Chelkov, G.
name: Chen, D. Y.
name: Chen, G.
name: Chen, H. S.
name: Chen, J. C.
name: Chen, M. L.
name: Chen, S. J.
name: Chen, Y. B.
name: Cheng, W.
name: Cibinetto, G.
name: Cossio, F.
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name: Dai, H. L.
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name: Destefanis, M.
name: De Mori, F.
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name: Dong, M. Y.
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name: Fan, J. Z.
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name: Fang, Y.
name: Farinelli, R.
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name: Feldbauer, F.
name: Felici, G.
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name: Fritsch, M.
name: Fu, C. D.
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name: Gao, Z.
name: Garillon, B.
name: Garzia, I.
name: Gilman, A.
name: Goetzen, K.
name: Gong, L.
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name: Gradl, W.
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name: Guskov, A.
name: Han, S.
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name: Harris, F. A.
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name: Heinsius, F. H.
name: Held, T.
name: Heng, Y. K.
name: Hou, Y. R.
name: Hou, Z. L.
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name: Huang, J. S.
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name: Andersson, W. Ikegami
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name: Jin, D. P.
name: Jin, S.
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name: Johansson, T.
name: Kalantar-Nayestanaki, N.
name: Kang, X. S.
name: Kappert, R.
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name: Liang, H.
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name: Liang, Y. F.
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name: Libby, J.
name: Lin, C. X.
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name: Liu, B.
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name: Liu, D. Y.
name: Liu, F. H.
name: Liu, Fang
name: Liu, Feng
name: Liu, H. B.
name: Liu, H. M.
name: Liu, Huanhuan
name: Liu, Huihui
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name: Liu, K. Y.
name: Liu, Ke
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name: Liu, S. B.
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name: Liu, X.
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name: Liu, Zhiqing
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name: Messchendorp, J. G.
name: Mezzadri, G.
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name: Mitchell, R. E.
name: Mo, X. H.
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name: Morales, C. Morales
name: Muchnoi, N. Yu.
name: Muramatsu, H.
name: Mustafa, A.
name: Nakhoul, S.
name: Nefedov, Y.
name: Nerling, F.
name: Nikolaev, I. B.
name: Ning, Z.
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name: Olsen, S. L.
name: Ouyang, Q.
name: Pacetti, S.
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name: Papenbrock, M.
name: Patteri, P.
name: Pelizaeus, M.
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name: Peters, K.
name: Pettersson, J.
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name: Pitka, A.
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name: Prasad, V.
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name: Weber, T.
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name: Yuncu, A.
name: Zafar, A. A.
name: Zeng, Y.
name: Zhang, B. X.
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name: Zhang, C. C.
name: Zhang, D. H.
name: Zhang, H. H.
name: Zhang, H. Y.
name: Zhang, J.
name: Zhang, J. L.
name: Zhang, J. Q.
name: Zhang, J. W.
name: Zhang, J. Y.
name: Zhang, J. Z.
name: Zhang, K.
name: Zhang, L.
name: Zhang, S. F.
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.
name: Zheng, Y. H.
name: Zhong, B.
name: Zhou, L.
name: Zhou, L. P.
name: Zhou, Q.
name: Zhou, X.
name: Zhou, X. K.
name: Zhou, X. R.
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. H.
name: Zhu, W. J.
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: 2019
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using a total of $9.0~\mathrm{fb}^{-1}$ of $e^+e^-$ collision data with center-of-mass energies between 4.15 and 4.30 GeV collected by the BESIII detector, we search for the processes $e^+e^-\to γX(3872)$ with $X(3872)\toπ^0χ_{cJ}$ for $J=0,1,2$. We report the first observation of $X(3872)\toπ^{0}χ_{c1}$, a new decay mode of the $X(3872)$, with a statistical significance of more than 5$σ$. Normalizing to the previously established process $e^+e^-\to γX(3872)$ with $X(3872)\toπ^+π^-J/ψ$, we find ${\cal B}(X(3872) \to π^0 χ_{c1})/{\cal B}(X(3872) \to π^+π^- J/ψ) = 0.88^{+0.33}_{-0.27}\pm0.10$, where the first error is statistical and the second is systematic. We set 90% confidence level upper limits on the corresponding ratios for the decays to $π^0χ_{c0}$ and $π^0χ_{c2}$ of 19 and 1.1, respectively.
description: 8 pages, 4 figures