标题： 超子$Λ(1520)$的电产生 显示英文标题

标题： Electroproduction of the $Λ(1520)$ hyperon

摘要： 在托马斯杰斐逊国家加速器设施的CLAS探测器上，使用4.05 GeV、4.25 GeV和4.46 GeV的电子束能量研究了反应$ep \to e'K^+\Lambda(1520)$和$\Lambda(1520) \to p'K^-$。 展示了$\Lambda$(1520) 电生产过程中$\theta_{K^+}$,$\phi_{K^+}$,$Q^2$和$W$的依赖关系，适用于动量区间 0.9$<$ $Q^2$ $<$ 2.4 GeV$^2$和 1.95$<$ $W$ $<$ 2.65 GeV。 此外，首次展示 $Q^2$ 对 $\Lambda$(1520) 衰变角分布的依赖关系。cos$\theta_{K^+}$ 角分布表明 {\it t}- 通道图主导了产生过程。 拟合到$\Lambda$(1520){\it t}通道螺旋性框架衰变角分布表明，$m_{z}=\pm{1/2}$母体贡献了总产额的大约60%，这表明此反应有显著的来自{\it t}通道过程的贡献，这些过程要么涉及K$^+$交换，要么与纵向耦合到交换的K$^*$相关。 The $Q^2$ dependence of the $\Lambda$(1520) production cross section is the same as that observed for $\Lambda$(1116) photo- and electroproduction. 显示英文摘要

摘要： The reaction $ep \to e'K^+\Lambda(1520)$ with $\Lambda(1520) \to p'K^-$ was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cos$\theta_{K^+}$, $\phi_{K^+}$, $Q^2$, and $W$ dependencies of $\Lambda$(1520) electroproduction are presented for the kinematic region 0.9 $<$ $Q^2$ $<$ 2.4 GeV$^2$ and 1.95 $<$ $W$ $<$ 2.65 GeV. Also, the $Q^2$ dependence of the $\Lambda$(1520) decay angular distribution is presented for the first time. The cos$\theta_{K^+}$ angular distributions suggest {\it t}-channel diagrams dominate the production process. Fits to the $\Lambda$(1520) {\it t}-channel helicity frame decay angular distributions indicate the $m_{z}=\pm{1/2}$ parentage accounts for about 60% of the total yield, which suggests this reaction has a significant contribution from {\it t}-channel processes with either K$^+$ exchange or longitudinal coupling to an exchanged K$^*$. The $Q^2$ dependence of the $\Lambda$(1520) production cross section is the same as that observed for $\Lambda$(1116) photo- and electroproduction.