$e^+ e^- \to Λ^+_c \barΛ^-_c$ cross sections and the $Λ_c^+$ electromagnetic form factors within the extended vector meson dominance model
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| Format: | Preprint |
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2023
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| _version_ | 1866917594736361472 |
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| author | Chen, Cheng Yan, Bing Xie, Ju-Jun |
| author_facet | Chen, Cheng Yan, Bing Xie, Ju-Jun |
| contents | Within the extended vector meson dominance model, we investigate the $e^+ e^- \to Λ^+_c \barΛ^-_c$ reaction and the electromagnetic form factors of the charmed baryon $Λ_c^+$. The model parameters are determined by fitting them to the cross sections of the process $e^+e^-\rightarrow Λ_c^+ \barΛ_c^-$ and the magnetic form factor $|G_M|$ of $Λ^+_c$. By considering four charmoniumlike states, called $ψ(4500)$, $ψ(4660)$, $ψ(4790)$, and $ψ(4900)$, we can well describe the current data on the $e^+ e^- \to Λ^+_c \barΛ^-_c$ reaction from the reaction threshold up to $4.96 \ \mathrm{GeV}$. In addition to the total cross sections and $|G_M|$, the ratio $|G_E/G_M|$ and effective form factor $|G_{\mathrm{eff}}|$ for $Λ^+_c$ are also calculated, and found that these calculations are consistent with the experimental data. Within the fitted model parameters, we have also estimated the charge radius of the charmed $Λ_c^+$ baryon. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_16753 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | $e^+ e^- \to Λ^+_c \barΛ^-_c$ cross sections and the $Λ_c^+$ electromagnetic form factors within the extended vector meson dominance model Chen, Cheng Yan, Bing Xie, Ju-Jun High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory Within the extended vector meson dominance model, we investigate the $e^+ e^- \to Λ^+_c \barΛ^-_c$ reaction and the electromagnetic form factors of the charmed baryon $Λ_c^+$. The model parameters are determined by fitting them to the cross sections of the process $e^+e^-\rightarrow Λ_c^+ \barΛ_c^-$ and the magnetic form factor $|G_M|$ of $Λ^+_c$. By considering four charmoniumlike states, called $ψ(4500)$, $ψ(4660)$, $ψ(4790)$, and $ψ(4900)$, we can well describe the current data on the $e^+ e^- \to Λ^+_c \barΛ^-_c$ reaction from the reaction threshold up to $4.96 \ \mathrm{GeV}$. In addition to the total cross sections and $|G_M|$, the ratio $|G_E/G_M|$ and effective form factor $|G_{\mathrm{eff}}|$ for $Λ^+_c$ are also calculated, and found that these calculations are consistent with the experimental data. Within the fitted model parameters, we have also estimated the charge radius of the charmed $Λ_c^+$ baryon. |
| title | $e^+ e^- \to Λ^+_c \barΛ^-_c$ cross sections and the $Λ_c^+$ electromagnetic form factors within the extended vector meson dominance model |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2312.16753 |