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The $ψ$(2S) state as a subthreshold pole in electron positron annihilation into $D\bar D$ final states
By performing a fit to the merged BES 2008 and BESIII 2024 $e^+e^-\to D\bar D$ cross-section data, we find that the $ψ(2\mathrm S)$ subthreshold pole influences this process markedly. The statistical significance of the $ψ(2\mathrm S)$ as a subthreshold pole is 8$σ$. A fit assuming it and seven reso
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