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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2503.06259 |
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| _version_ | 1866910979387817984 |
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| author | Zhang, Xiao-Yu Shi, Pan-Pan Guo, Feng-Kun |
| author_facet | Zhang, Xiao-Yu Shi, Pan-Pan Guo, Feng-Kun |
| contents | The absence of observed charmonium-like states with the exotic quantum numbers $J^{PC}=1^{-+}$ has prompted us to investigate the production rates of the $1^{-+}$ $D\bar D_1(2420)$ and $D^*\bar D_1(2420)$ hadronic molecules, which we refer to as $η_{c1}$ and $η_{c1}^{\prime}$, respectively, in electron-positron collisions. Assuming a hadronic molecular nature for the vector charmonium-like states $ψ(4360)$ and $ψ(4415)$, we evaluate the radiative decay widths of $ψ(4360)\toγη_{c1}$ and $ψ(4415)\toγη_{c1}^{\prime}$. Using these decay widths, we estimate the cross sections for producing $η_{c1}$ and $η_{c1}^{\prime}$ in electron-positron annihilations, as well as the event numbers at the planned Super $τ$-Charm Facility. Our results suggest that the ideal energy region for observing these states is around $4.44$ and $4.50$ GeV, just above the $D^* \bar D_1(2420)$ and $D^*\bar D_2^*(2460)$ thresholds, respectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_06259 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Production of $1^{-+}$ exotic charmonium-like states in electron-positron collisions Zhang, Xiao-Yu Shi, Pan-Pan Guo, Feng-Kun High Energy Physics - Phenomenology High Energy Physics - Experiment The absence of observed charmonium-like states with the exotic quantum numbers $J^{PC}=1^{-+}$ has prompted us to investigate the production rates of the $1^{-+}$ $D\bar D_1(2420)$ and $D^*\bar D_1(2420)$ hadronic molecules, which we refer to as $η_{c1}$ and $η_{c1}^{\prime}$, respectively, in electron-positron collisions. Assuming a hadronic molecular nature for the vector charmonium-like states $ψ(4360)$ and $ψ(4415)$, we evaluate the radiative decay widths of $ψ(4360)\toγη_{c1}$ and $ψ(4415)\toγη_{c1}^{\prime}$. Using these decay widths, we estimate the cross sections for producing $η_{c1}$ and $η_{c1}^{\prime}$ in electron-positron annihilations, as well as the event numbers at the planned Super $τ$-Charm Facility. Our results suggest that the ideal energy region for observing these states is around $4.44$ and $4.50$ GeV, just above the $D^* \bar D_1(2420)$ and $D^*\bar D_2^*(2460)$ thresholds, respectively. |
| title | Production of $1^{-+}$ exotic charmonium-like states in electron-positron collisions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2503.06259 |