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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2604.01074 |
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| _version_ | 1866918423813947392 |
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| author | Kim, Sang-Ho |
| author_facet | Kim, Sang-Ho |
| contents | We investigate the mechanisms of strangeness production in the $π^- p \to K^{*0} Σ^0$ and $π^- p \to K^{*+} Σ^-$ reactions within a hybrid Regge framework in which effective Lagrangian vertices are combined with Reggeized exchanges. The nonresonant background consists of $t$-channel $K$- and $K^*$-Reggeon exchanges, $s$-channel nucleon and $Δ$ exchanges, and $u$-channel $Σ$- and $Λ$-Reggeon exchanges, whose roles differ markedly between the two isospin channels. We additionally include several $N^*$ and $Δ^*$ resonances in the $s$ channel and find that the $Δ(2150)1/2^-$ resonance provides the dominant near-threshold contribution. The resulting total and differential cross sections and spin-density matrix elements (SDMEs) are in good agreement with the available data. Additional measurements near threshold ($W \lesssim$ 2.5 GeV) would be valuable for clarifying the role of $s$-channel baryon resonances. Within the same framework, with Regge trajectories and energy-scale parameters fixed by a QGSM-motivated prescription, we also predict the cross sections for the charm-production reactions $π^- p \to D^{*-} Σ_c^+$ and $π^- p \to D^{*0} Σ_c^0$. Their total cross sections are suppressed by approximately $4$--$5$ and $7$--$8$ orders of magnitude, respectively, compared with those of the corresponding strangeness-production reactions. These results may serve as useful guidance for future experiments at facilities such as J-PARC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_01074 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Production of $K^* Σ$ and $D^* Σ_c$ in pion-induced reactions off the nucleon Kim, Sang-Ho High Energy Physics - Phenomenology We investigate the mechanisms of strangeness production in the $π^- p \to K^{*0} Σ^0$ and $π^- p \to K^{*+} Σ^-$ reactions within a hybrid Regge framework in which effective Lagrangian vertices are combined with Reggeized exchanges. The nonresonant background consists of $t$-channel $K$- and $K^*$-Reggeon exchanges, $s$-channel nucleon and $Δ$ exchanges, and $u$-channel $Σ$- and $Λ$-Reggeon exchanges, whose roles differ markedly between the two isospin channels. We additionally include several $N^*$ and $Δ^*$ resonances in the $s$ channel and find that the $Δ(2150)1/2^-$ resonance provides the dominant near-threshold contribution. The resulting total and differential cross sections and spin-density matrix elements (SDMEs) are in good agreement with the available data. Additional measurements near threshold ($W \lesssim$ 2.5 GeV) would be valuable for clarifying the role of $s$-channel baryon resonances. Within the same framework, with Regge trajectories and energy-scale parameters fixed by a QGSM-motivated prescription, we also predict the cross sections for the charm-production reactions $π^- p \to D^{*-} Σ_c^+$ and $π^- p \to D^{*0} Σ_c^0$. Their total cross sections are suppressed by approximately $4$--$5$ and $7$--$8$ orders of magnitude, respectively, compared with those of the corresponding strangeness-production reactions. These results may serve as useful guidance for future experiments at facilities such as J-PARC. |
| title | Production of $K^* Σ$ and $D^* Σ_c$ in pion-induced reactions off the nucleon |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.01074 |