Cross Section Measurement of $e^+e^- \rightarrow π^+π^-ψ(3686)$ from $\sqrt{s}=4.0076$~GeV to 4.6984~GeV
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Ahmed, S.
name: Albrecht, M.
name: Aliberti, R.
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name: Ferroli, R. Baldini
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name: Berger, N.
name: Bertani, M.
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name: Chelkov, G.
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name: Chen, G.
name: Chen, H. S.
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name: Cossio, F.
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name: Fang, Y.
name: Farinelli, R.
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name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Feng, J. H.
name: Fritsch, M.
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name: Gao, Y. G.
name: Garzia, I.
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name: Gilman, A
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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: Using data samples with a total integrated luminosity of $20.1~\rm fb^{-1}$ collected by the BESIII detector operating at the BEPCII collider, the cross section of the process $e^+e^- \rightarrow π^+π^-ψ(3686)$ is measured at center-of-mass energies between 4.0076 and 4.6984 GeV. The measured cross section is consistent with previous results, but with much improved precision. A fit to the measured energy-dependent cross section, which includes three Breit-Wigner functions and a non-resonant contribution, confirms the existence of the charmonium-like states $Y(4220)$, $Y(4390)$, and $Y(4660)$. This is the first observation of the $Y(4660)$ at the BESIII experiment.
description: 12 pages, 5 figures