$Δ(1232)$ production in the $γp \to ϕπp$ reaction
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911158281175040 |
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| author | Chen, Ya-Ke Pan, Yi Liu, Bo-Chao |
| author_facet | Chen, Ya-Ke Pan, Yi Liu, Bo-Chao |
| contents | In this work, the production of baryon resonances in the $γp \to ϕπp$ reaction near threshold is investigated within an effective Lagrangian approach. incorporates intermediate resonances, including $Δ(1232)$, $N(1440)$, $N(1520)$, and $N(1535)$, alongside non-resonant background contributions. The results indicate that the reaction is dominated by the $Δ(1232)$ excitation near threshold. A key focus of this study is the exploration of the $a_0(980)$ meson exchange in the $Δ(1232)$ production, as this reaction offers a unique opportunity to probe the poorly known $Δ(1232)N a_0$ coupling. We demonstrate that the parity asymmetry ($P_σ$), accessible through the $ϕ$-meson's spin density matrix elements, serves as a suitable experimental observable to identify the contribution from the $a_0(980)$ exchange. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_13630 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $Δ(1232)$ production in the $γp \to ϕπp$ reaction Chen, Ya-Ke Pan, Yi Liu, Bo-Chao Nuclear Theory High Energy Physics - Phenomenology In this work, the production of baryon resonances in the $γp \to ϕπp$ reaction near threshold is investigated within an effective Lagrangian approach. incorporates intermediate resonances, including $Δ(1232)$, $N(1440)$, $N(1520)$, and $N(1535)$, alongside non-resonant background contributions. The results indicate that the reaction is dominated by the $Δ(1232)$ excitation near threshold. A key focus of this study is the exploration of the $a_0(980)$ meson exchange in the $Δ(1232)$ production, as this reaction offers a unique opportunity to probe the poorly known $Δ(1232)N a_0$ coupling. We demonstrate that the parity asymmetry ($P_σ$), accessible through the $ϕ$-meson's spin density matrix elements, serves as a suitable experimental observable to identify the contribution from the $a_0(980)$ exchange. |
| title | $Δ(1232)$ production in the $γp \to ϕπp$ reaction |
| topic | Nuclear Theory High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.13630 |