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| Format: | Preprint |
| Veröffentlicht: |
2024
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| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2410.19860 |
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Inhaltsangabe:
- In the present paper, we investigate the production of a baryon pair in $e^+e^-$ annihilation to study the structure of baryons. To study the basic structure of the Standard Model, it is also necessary to consider the baryon-antibaryon pair production at the electron-positron linear collider. The production of a baryon pair in electron-positron annihilation provides a powerful tool at higher center-of-mass energies. In this work, we present phenomenological results for $Σ^+ \bar Σ^-$ production in $e^+e^-$ collision at the BESIII Collider. We investigate a hyperon pair produced in the reaction $e^+e^- \to Σ^+ \barΣ^-$. Two different contributions are considered: the $D$ meson loop and the three-gluon charmonium annihilation loop. Taking into account the contributions of the $D$-meson loop and three-gluon loops and the interference of all diagrams, we calculate the total cross section of the process $e^+e^- \to Σ^+ \barΣ^-$. With respect to a purely electromagnetic mechanism, large relative phases are generated for these contributions. We obtain as a byproduct a fit of the electromagnetic form factor of the $Σ$ hyperon for a large momentum transferred region. In this process, in addition to $ψ(3770)$ charmonium, we also take into account the contributions of other charmonium (-like) states, $ψ(4040)$, \,\,$ψ(4160)$, \,\,$Y(4230)$,\,\,$Y(4360)$,\,\,$ψ(4415)$, and $Y(4660)$. The obtained results are in good agreement with experimental data.