Measurement of $e^+e^-\toγχ_{c0,c1,c2}$ cross sections at center-of-mass energies between 3.77 and 4.60 GeV
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Ahmed, S.
name: Albrecht, M.
name: Aliberti, R.
name: Amoroso, A.
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name: An, Q.
name: Bai, X. H.
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name: Bakina, O.
name: Ferroli, R. Baldini
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name: Begzsuren, K.
name: Berger, N.
name: Bertani, M.
name: Bettoni, D.
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name: Bloms, J.
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name: Calcaterra, A.
name: Cao, G. F.
name: Cao, N.
name: Cetin, S. A.
name: Chang, J. F.
name: Chang, W. L.
name: Chelkov, G.
name: Chen, D. Y.
name: Chen, G.
name: Chen, H. S.
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name: Chen, S. J.
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name: Chen, Y. B.
name: Chen, Z. J
name: Cheng, W. S.
name: Cibinetto, G.
name: Cossio, F.
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name: Dai, H. L.
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name: Dbeyssi, A.
name: de Boer, R. E.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
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name: Destefanis, M.
name: De Mori, F.
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name: Dong, C.
name: Dong, J.
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name: Dong, M. Y.
name: Dong, X.
name: Du, S. X.
name: Fan, Y. L.
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: Feng, J. H.
name: Fritsch, M.
name: Fu, C. D.
name: Gao, Y.
name: Gao, Y.
name: Gao, Y.
name: Gao, Y. G.
name: Garzia, I.
name: Ge, P. T.
name: Geng, C.
name: Gersabeck, E. M.
name: Gilman, A
name: Goetzen, K.
name: Gong, L.
name: Gong, W. X.
name: Gradl, W.
name: Greco, M.
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name: Guo, A. Q.
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name: Guskov, A.
name: Han, T. T.
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name: Harris, F. A.
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name: Heinsius, F. H.
name: Heinz, C. H.
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name: Holtmann, T.
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name: Hussain, T.
name: Hüsken, N
name: Andersson, W. Ikegami
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name: Liao, G. R.
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name: Malik, Q. A.
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name: Peters, K.
name: Pettersson, J.
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name: Zhou, X. R.
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name: Zhu, A. N.
name: Zhu, J.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S. H.
name: Zhu, T. J.
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Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The $e^+e^-\toγχ_{cJ}$ ($J=0,1,2$) processes are studied at center-of-mass energies ranging from 3.773 to 4.600 GeV, using a total integrated luminosity of 19.3 fb$^{-1}$ $e^+e^-$ annihilation data accumulated with the BESIII detector at BEPCII. We observe for the first time $e^+e^-\toγχ_{c1,c2}$ signals at $\sqrt{s}=$ 4.180 GeV with statistical significances of 7.6$σ$ and 6.0$σ$, respectively. The production cross section of $e^+e^-\toγχ_{c1,c2}$ at each center-of-mass energy is also measured. We find that the line shape of the $e^+e^-\toγχ_{c1}$ cross section can be described with conventional charmonium states $ψ(3686)$, $ψ(3770)$, $ψ(4040)$, $ψ(4160)$. Compared with this, for the $e^+e^-\toγχ_{c2}$ channel, one more additional resonance is added to describe the cross section line shape. Its mass and width are measured to be $M=4371.7\pm7.5\pm1.8$ MeV/$c^2$ and $Γ^{tot}=51.1\pm17.6\pm1.9$ MeV, where the first uncertainties are statistical and the second systematic. The significance of this resonance is estimated to be 5.8$σ$, and its parameters agree with the $Y(4360)$ resonance previously reported in $e^+e^-\toπ^+π^-ψ(3686)$, and the $Y(4390)$ in $e^+e^-\toπ^+π^-h_c$ within uncertainties. No significant signal for the $e^+e^-\toγχ_{c0}$ process is observed, and the upper limits of Born cross sections $σ_{B}(e^+e^-\toγχ_{c0})$ at 90\% confidence level are reported.
description: 12 pages, 5 figures