Subthreshold poles in electron-positron annihilation. D\bar{D} final states
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908658307170304 |
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| author | Lichard, Peter |
| author_facet | Lichard, Peter |
| contents | We show that the $ψ(2\mathrm S)$ subthreshold pole influences the cross section of the electron-positron annihilation into the $\mathrm D^+\mathrm D^-$ and $\mathrm D^0\bar\mathrm D^0$ final states. We perform a fit to the merged BES \cite{bes2008} and BESIII \cite{besiii2024} data, providing the cross section for $e^+e^-$ annihilation into those final states. The statistical significance of the $ψ(2\mathrm S)$ as a subthreshold pole is 8.2$σ$. A fit assuming it and seven resonances excels with the fit quality characterized by $χ^2/\mathrm{NDF}=240.4/284$, which means a $p$-value of 97\%. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_18540 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Subthreshold poles in electron-positron annihilation. D\bar{D} final states Lichard, Peter High Energy Physics - Phenomenology High Energy Physics - Experiment We show that the $ψ(2\mathrm S)$ subthreshold pole influences the cross section of the electron-positron annihilation into the $\mathrm D^+\mathrm D^-$ and $\mathrm D^0\bar\mathrm D^0$ final states. We perform a fit to the merged BES \cite{bes2008} and BESIII \cite{besiii2024} data, providing the cross section for $e^+e^-$ annihilation into those final states. The statistical significance of the $ψ(2\mathrm S)$ as a subthreshold pole is 8.2$σ$. A fit assuming it and seven resonances excels with the fit quality characterized by $χ^2/\mathrm{NDF}=240.4/284$, which means a $p$-value of 97\%. |
| title | Subthreshold poles in electron-positron annihilation. D\bar{D} final states |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2505.18540 |