论文标题
分析$γp\ to K^{*+}λ$的自旋密度矩阵元素的数据分析
Analysis of the data on spin density matrix elements for $γp \to K^{*+}Λ$
论文作者
论文摘要
在我们以前的工作中[物理学。 Rev. C {\ BF 96}，035206（2017）]，在有效的Lagrangian方法中分析了CLAS协作报告的$γp\ to K^{*+}λ$的高精度差截面数据。 It was found that apart from the $t$-channel $K$, $K^*$, and $κ$ exchanges, the $u$-channel $Λ$, $Σ$, and $Σ^*$ exchanges, the $s$-channel $N$ exchange, and the interaction current, one needs to introduce at least two nucleon resonances in the $s$ channel in constructing the reaction amplitudes to describe the cross-section 数据。所需的共鸣之一是$ n（2060）5/2^ - $，另一个可能是$ n（2000）5/2^+$，$ n（2040）3/2^+$，$ n（2100）1/2^+$，$ n（2100）1/2^+$，$ n（2120）3/2^ - $ n（2190）$ n（2190）7/2^-2^-2^-2^-2^-2^ - $ resonances。在本文中，我们在分析中进一步包括了CLAS协作最近报道的$ K^*$ Meson的旋转密度矩阵元素的数据，目的是对提取共振含量施加进一步的限制，并更好地了解反应机制。事实证明，借助旋转密度矩阵元素的新数据，只有$ n（2060）5/2^ - $ and $ n（2000）5/2^+$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ n（2000）5/2^+$ ressonce添加了新的五个可能的解决方案的共振，从差异横截面数据分析中提取的五种可能的解决方案可以令人满意地描述差分横截面和旋转密度的数据上的数据。进一步的分析表明，该反应以$ t $ -CHANNEL $ K $交易所和$ S $ -CHANNEL $ N（2060）5/2^ - $和$ N（2000）5/2^+$交易所为主导。
In our previous work [Phys. Rev. C {\bf 96}, 035206 (2017)], the high-precision differential cross-section data for $γp \to K^{*+}Λ$ reported by the CLAS Collaboration has been analyzed within an effective Lagrangian approach. It was found that apart from the $t$-channel $K$, $K^*$, and $κ$ exchanges, the $u$-channel $Λ$, $Σ$, and $Σ^*$ exchanges, the $s$-channel $N$ exchange, and the interaction current, one needs to introduce at least two nucleon resonances in the $s$ channel in constructing the reaction amplitudes to describe the cross-section data. One of the needed resonances is $N(2060)5/2^-$, and the other one could be one of the $N(2000)5/2^+$, $N(2040)3/2^+$, $N(2100)1/2^+$, $N(2120)3/2^-$, and $N(2190)7/2^-$ resonances. In this paper, we further include in our analysis the data on spin density matrix elements for $K^*$ meson reported recently by the CLAS Collaboration, with the purpose being to impose further constraints on extracting the resonance contents and to gain a better understanding of the reaction mechanism. It turns out that with the new data on spin density matrix elements taken into account, only the set with the $N(2060)5/2^-$ and $N(2000)5/2^+$ resonances among those five possible solutions extracted from the analysis of the differential cross-section data can satisfactorily describe the data on both the differential cross sections and the spin density matrix elements. Further analysis shows that this reaction is dominated by the $t$-channel $K$ exchange and $s$-channel $N(2060)5/2^-$ and $N(2000)5/2^+$ exchanges.
