First observations of $h_c \to$ hadrons
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.
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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.
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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.
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name: Cibinetto, G.
name: Cossio, F.
name: Dai, H. L.
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name: Dbeyssi, A.
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name: De Mori, F.
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name: Fang, S. S.
name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Fegan, S.
name: Feldbauer, F.
name: Felici, G.
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name: Fioravanti, E.
name: Fritsch, M.
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name: Zhang, Y. T.
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name: Zhang, Yao
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name: Zhao, Lei
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name: Zhemchugov, A.
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name: Zhou, Xu
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name: Zhu, J.
name: Zhu, J.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S.
name: Zhu, S. H.
name: Zhu, X. L.
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Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Based on $(4.48 \pm 0.03) \times 10^{8}$ $ψ(3686)$ events collected with the BESIII detector, five $h_c$ hadronic decays are searched for via process $ψ(3686) \to π^0 h_c$. Three of them, $h_c \to p \bar{p} π^+ π^-$, $π^+ π^- π^0$, and $2(π^+ π^-) π^0$ are observed for the first time, with statistical significances of 7.4$σ$, $4.9σ$, and 9.1$σ$, and branching fractions of $(2.89\pm0.32\pm0.55)\times10^{-3}$, $(1.60\pm0.40\pm0.32)\times10^{-3}$, and $(7.44\pm0.94\pm1.56)\times10^{-3}$, respectively, where the first uncertainties are statistical and the second systematic. No significant signal is observed for the other two decay modes, and the corresponding upper limits of the branching fractions are determined to be $B(h_c \to 3(π^+ π^-) π^0)&lt;8.7\times10^{-3}$ and $B(h_c \to K^+ K^- π^+ π^-)&lt;5.8\times10^{-4}$ at 90% confidence level.
description: 17 pages, 16 figures