Threshold effects as the origin of $Y(4500)$ observed in $e^+e^-\to J/ψK^+K^-$
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908614341427200 |
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| author | Wang, Xiao-Yun Wang, Liu-Lin Liu, Xiao-Hai Zhao, Qiang |
| author_facet | Wang, Xiao-Yun Wang, Liu-Lin Liu, Xiao-Hai Zhao, Qiang |
| contents | The BESIII collaboration has recently observed a resonant structure $Y(4500)$ in $e^{+}e^{-}\to J/ψK^{+}K^{-}$, whose origin remains unresolved. In this study, we analyze the cross section line shape of $e^{+}e^{-}\to J/ψK^{+}K^{-}$ by taking into account the $ψ(4415)$ state and intermediate charmed meson loops. By treating $ψ(4415)$ as both a pure $S$-wave state and $S$-$D$ mixed states, and introducing the $Z_{cs}^{(\prime)}$ resonance, we find that the $Y(4500)$ peak at $\sqrt{s}=4.5~\text{GeV}$ arises from the triangle singularity mechanism in the $Z_{cs}^{(\prime)}$-mediated rescattering processes, supporting its interpretation as a threshold effect rather than a conventional resonance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_23099 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Threshold effects as the origin of $Y(4500)$ observed in $e^+e^-\to J/ψK^+K^-$ Wang, Xiao-Yun Wang, Liu-Lin Liu, Xiao-Hai Zhao, Qiang High Energy Physics - Phenomenology High Energy Physics - Experiment The BESIII collaboration has recently observed a resonant structure $Y(4500)$ in $e^{+}e^{-}\to J/ψK^{+}K^{-}$, whose origin remains unresolved. In this study, we analyze the cross section line shape of $e^{+}e^{-}\to J/ψK^{+}K^{-}$ by taking into account the $ψ(4415)$ state and intermediate charmed meson loops. By treating $ψ(4415)$ as both a pure $S$-wave state and $S$-$D$ mixed states, and introducing the $Z_{cs}^{(\prime)}$ resonance, we find that the $Y(4500)$ peak at $\sqrt{s}=4.5~\text{GeV}$ arises from the triangle singularity mechanism in the $Z_{cs}^{(\prime)}$-mediated rescattering processes, supporting its interpretation as a threshold effect rather than a conventional resonance. |
| title | Threshold effects as the origin of $Y(4500)$ observed in $e^+e^-\to J/ψK^+K^-$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2510.23099 |