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arXiv 2002.04213hep-phnucl-th
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$γp \to K^+ Σ^0(1385)$光产生中的核子共振和$Δ$共振

Nucleon and $Δ$ resonances in $γp \to K^+ Σ^0(1385)$ photoproduction

Ai-Chao Wang, Wen-Ling Wang, Fei Huang

备注：
11 pages, 9 figures. Version published in PRD. arXiv admin note: text overlap with arXiv:1704.04562, arXiv:1810.07012
发表信息：
Phys. Rev. D 101, 074025 (2020)
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摘要：

基于树能级玻恩近似下的有效拉格朗日方法研究了$γp \to K^+ Σ^0(1385)$的光生反应，旨在了解该反应的反应机理和共振含量及其相关参数.除了$t$ -通道$K$和$K^\ast(892)$交换、$s$ -通道核子（$N$）交换、$u$ -通道$Λ$交换和广义接触项之外，在构造反应振幅时考虑了$s$通道中最小数目的$N$和$Δ$共振的交换以描述实验数据.结果发现，最新的微分截面数据从CLAS协作可以很好地再现，包括$N(1895){1/2}^-$，$Δ(1900){1/2}^-$，和$Δ(1930){5/2}^-$共振之一。详细讨论了$γp \to K^+ Σ^0(1385)$的反应机理，给出了该反应的束流和靶的不对称性的预测。$γp \to K^0 Σ^+(1385)$的横截面被证明能够进一步约束理论模型，并确定$γp \to K^+ Σ^0(1385)$的共振内容。

英文摘要：

The photoproduction of $γp \to K^+ Σ^0(1385)$ is investigated based on an effective Lagrangian approach using the tree-level Born approximation, with the purpose of understanding the reaction mechanisms and resonance contents and their associated parameters in this reaction. In addition to the $t$-channel $K$ and $K^\ast(892)$ exchanges, $s$-channel nucleon ($N$) exchange, $u$-channel $Λ$ exchange, and generalized contact term, the exchanges of a minimum number of $N$ and $Δ$ resonances in the $s$ channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that the most recent differential cross-section data from the CLAS Collaboration can be well reproduced by including one of the $N(1895){1/2}^-$, $Δ(1900){1/2}^-$, and $Δ(1930){5/2}^-$ resonances. The reaction mechanisms of $γp \to K^+ Σ^0(1385)$ are discussed in detail, and the predictions of the beam and target asymmetries for this reaction are given. The cross sections of $γp \to K^0 Σ^+(1385)$ are shown to be able to further constrain the theoretical models and pin down the resonance contents for $γp \to K^+ Σ^0(1385)$.

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