Combined analysis of the data on cross sections and spin density matrix elements for $K^*Σ$ photoproduction reactions
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2026
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| author | Wang, Ai-Chao Wei, Neng-Chang Huang, Fei |
| author_facet | Wang, Ai-Chao Wei, Neng-Chang Huang, Fei |
| contents | In our earlier work [Phys. Rev. C \textbf{98}, 045209 (2018)], we analyzed the differential cross-section data from the CLAS Collaboration for the reactions $γp \to K^{*+}Σ^0$ and $γp \to K^{*0} Σ^+$ using an effective Lagrangian approach. We found that a satisfactory description of the data required the inclusion of the $s$-channel $Δ(1905)5/2^+$ resonance, in addition to $t$-channel exchanges of $K$, $κ$, and $K^*$, $s$-channel contributions from nucleons ($N$) and $Δ$, $u$-channel exchanges of $Λ$, $Σ$, and $Σ^*$, and a generalized contact term. In the present work, we extend our analysis to incorporate the data on spin density matrix elements from the LEPS Collaboration for the $γp \to K^{*0}Σ^+$ reaction at photon energies $E_γ = 1.85$--$2.96$ GeV. Our goal is to impose more stringent constraints on the theoretical model and obtain a more reliable understanding of the reaction mechanisms. We obtain two fits that describe the experimental data equally well. In both fits, the $Δ(1905)5/2^+$ resonance plays an important role. However, the contribution from $t$-channel $κ$ exchange is significant in one fit but negligible in the other. This finding contradicts earlier claims in the literature that the LEPS parity spin asymmetry $P_σ$ data support a dominant role of $κ$ exchange in $γp \to K^{*0}Σ^+$. We also present predictions for $P_σ$ at $E_γ= 8.5$ GeV, which may help clarify whether $κ$ exchange is indeed dominant in this reaction. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_28337 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Combined analysis of the data on cross sections and spin density matrix elements for $K^*Σ$ photoproduction reactions Wang, Ai-Chao Wei, Neng-Chang Huang, Fei High Energy Physics - Phenomenology Nuclear Theory In our earlier work [Phys. Rev. C \textbf{98}, 045209 (2018)], we analyzed the differential cross-section data from the CLAS Collaboration for the reactions $γp \to K^{*+}Σ^0$ and $γp \to K^{*0} Σ^+$ using an effective Lagrangian approach. We found that a satisfactory description of the data required the inclusion of the $s$-channel $Δ(1905)5/2^+$ resonance, in addition to $t$-channel exchanges of $K$, $κ$, and $K^*$, $s$-channel contributions from nucleons ($N$) and $Δ$, $u$-channel exchanges of $Λ$, $Σ$, and $Σ^*$, and a generalized contact term. In the present work, we extend our analysis to incorporate the data on spin density matrix elements from the LEPS Collaboration for the $γp \to K^{*0}Σ^+$ reaction at photon energies $E_γ = 1.85$--$2.96$ GeV. Our goal is to impose more stringent constraints on the theoretical model and obtain a more reliable understanding of the reaction mechanisms. We obtain two fits that describe the experimental data equally well. In both fits, the $Δ(1905)5/2^+$ resonance plays an important role. However, the contribution from $t$-channel $κ$ exchange is significant in one fit but negligible in the other. This finding contradicts earlier claims in the literature that the LEPS parity spin asymmetry $P_σ$ data support a dominant role of $κ$ exchange in $γp \to K^{*0}Σ^+$. We also present predictions for $P_σ$ at $E_γ= 8.5$ GeV, which may help clarify whether $κ$ exchange is indeed dominant in this reaction. |
| title | Combined analysis of the data on cross sections and spin density matrix elements for $K^*Σ$ photoproduction reactions |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2603.28337 |