标题： 联合分析$γn \to K^0Σ^0$和$γn \to K^+Σ^-$反应 显示英文标题

标题： Combined analysis of the $γn \to K^0Σ^0$ and $γn \to K^+Σ^-$ reactions

摘要： 最近发布的关于$\gamma n \to K^0\Sigma^0$的微分截面数据来自 A2 和 BGOOD 合作组，用于检验我们在以前的工作中构建的理论模型 [Phys. Rev. D \textbf{105}, 094017 (2022)] 对$\gamma n \to K^+\Sigma^-$的预测，发现该模型预测能够定性地再现 A2 数据，但无法描述 BGOOD 数据。 然后，对$\gamma n \to K^0\Sigma^0$和$\gamma n \to K^+\Sigma^-$反应进行了综合分析，以修正理论模型。 由于不一致问题，A2 和 BGOOD 数据分别包含在拟合中。 在包含A2数据的情况下，$\gamma n \to K^0\Sigma^0$和$\gamma n \to K^+\Sigma^-$的数据可以被很好地描述，而$N(1710)1/2^+$、$N(1880)1/2^+$、$N(1900)3/2^+$和$\Delta(1920)3/2^+$共振的贡献被发现主导了低能区的反应。 在包含BGOOD数据的情况下，尽管大部分$\gamma n \to K^+ \Sigma^-$反应的数据可以被描述，除了在较低能量下的束流不对称性存在一些明显的差异，但BGOOD数据对于$\gamma n \to K^0\Sigma^0$只能定性描述，且发现$N(1710)1/2^+$、$N(1900)3/2^+$和$\Delta(1910)1/2^+$共振的贡献在较低能量区域主导了反应。 在两种情况下，$t$通道的$K^\ast(892)$交换在较高能量区域的前向角度中被认为起着关键作用。 对$\gamma n \to K^0\Sigma^0$的进一步精确测量被要求来解开 A2 和 BGOOD 合作组数据集之间的差异。 显示英文摘要

摘要： The recently released data on differential cross sections for $\gamma n \to K^0\Sigma^0$ from the A2 and BGOOD Collaborations are used to examine the theoretical model constructed in our previous work [Phys. Rev. D \textbf{105}, 094017 (2022)] for $\gamma n \to K^+\Sigma^-$, and it is found that the model predictions are able to qualitatively reproduce the A2 data but fail to describe the BGOOD data. Then, a combined analysis of the $\gamma n \to K^0\Sigma^0$ and $\gamma n \to K^+\Sigma^-$ reactions is performed to revise the theoretical model. Due to the inconsistency problem, the A2 and BGOOD data are included in fits separately. In the case of including the A2 data, both the data for $\gamma n \to K^0\Sigma^0$ and $\gamma n \to K^+\Sigma^-$ can be fairly well described, and the contributions from the $N(1710)1/2^+$, $N(1880)1/2^+$, $N(1900)3/2^+$, and $\Delta(1920)3/2^+$ resonances are found to dominate the reactions in the lower energy region. While in the case of including the BGOOD data, although most of the data for the $\gamma n \to K^+ \Sigma^-$ reaction can be described with the exception of some noticeable discrepancies on beam asymmetries at lower energies, the BGOOD data for $\gamma n \to K^0\Sigma^0$ can be only qualitatively described, and the contributions from the $N(1710)1/2^+$, $N(1900)3/2^+$, and $\Delta(1910)1/2^+$ resonances are found to dominate the reactions in the lower energy region. In both cases, the $t$-channel $K^\ast(892)$ exchange is found to play a crucial role at forward angles in the higher energy region. Further precise measurements of data for $\gamma n \to K^0\Sigma^0$ are called on to disentangle the discrepancies between the data sets from the A2 and BGOOD Collaborations.