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| Auteurs principaux: | , |
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| Format: | Preprint |
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2025
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| Accès en ligne: | https://arxiv.org/abs/2508.03454 |
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| _version_ | 1866908886599991296 |
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| author | Zhang, Ruoyu Wang, Xiongfei |
| author_facet | Zhang, Ruoyu Wang, Xiongfei |
| contents | Recently, the BESIII experiment performed a measurement of the energy-dependent Born cross section and the effective form factor for the $e^+e^-\toΩ^-\barΩ^+$ reaction at center-of-mass energies ranging from 3.4 to 4.7 GeV. A fit to the energy dependence of the dressed cross section is performed. With the assumption of a charmonium (like) resonance [i.e., $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, or $Y(4660)$] plus a power-law function, the fit is applied to the data from the recent BESIII measurement, which was additionally combined with previous CLEO-c measurement data. No significance is found. The products of the branching fraction and the two electronic partial widths for the assumed charmonium(-like) states decaying into the $Ω^-\barΩ^+$ final states are also provided. In addition, by taking the world average values of the electronic branching fraction, the branching fractions for $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $ψ(4415)$ decaying into $Ω^-\barΩ^+$ final states at the 90\% confidence level are determined for the first time. These are found to be at least an order of magnitude larger than expected from predictions using a scaling based on the observed electronic widths. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03454 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for Charmonium(-like) states decaying into the $Ω^-\barΩ^+$ final states Zhang, Ruoyu Wang, Xiongfei High Energy Physics - Experiment Recently, the BESIII experiment performed a measurement of the energy-dependent Born cross section and the effective form factor for the $e^+e^-\toΩ^-\barΩ^+$ reaction at center-of-mass energies ranging from 3.4 to 4.7 GeV. A fit to the energy dependence of the dressed cross section is performed. With the assumption of a charmonium (like) resonance [i.e., $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, or $Y(4660)$] plus a power-law function, the fit is applied to the data from the recent BESIII measurement, which was additionally combined with previous CLEO-c measurement data. No significance is found. The products of the branching fraction and the two electronic partial widths for the assumed charmonium(-like) states decaying into the $Ω^-\barΩ^+$ final states are also provided. In addition, by taking the world average values of the electronic branching fraction, the branching fractions for $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, $ψ(4415)$ decaying into $Ω^-\barΩ^+$ final states at the 90\% confidence level are determined for the first time. These are found to be at least an order of magnitude larger than expected from predictions using a scaling based on the observed electronic widths. |
| title | Search for Charmonium(-like) states decaying into the $Ω^-\barΩ^+$ final states |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.03454 |