标题： $Λ(1520)$重子的电产生 显示英文标题

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

摘要： 反应$ep \to e'K^+\Lambda(1520)$与$\Lambda(1520) \to p'K^-$在电子束能量为4.05、4.25和4.46 GeV下，使用托马斯·杰斐逊国家加速器设施的CLAS探测器进行了研究。 cos$\theta_{K^+}$, $\phi_{K^+}$, $Q^2$, and $W$的依赖关系在 0.9 $<$ $Q^2$ $<$ 2.4 GeV$^2$和 1.95 $<$ $W$ $<$ 2.65 GeV 的运动学区域内给出了$\Lambda$(1520) 电子产额。 此外，首次展示了 $Q^2$ 对 $\Lambda$(1520) 衰变角度分布的影响。cos$\theta_{K^+}$角度分布表明 {\it t} 通道图在产生过程中占主导地位。 对$\Lambda$(1520){\it t}通道自旋框架衰变角度分布的拟合表明，$m_{z}=\pm{1/2}$的母体占总产率的大约60%，这表明该反应从{\it t}通道过程有显著贡献，这些过程涉及 K$^+$交换或与交换的 K$^*$的纵向耦合。 $Q^2$依赖性的$\Lambda$(1520) 生成截面与观察到的$\Lambda$(1116) 光生和电生现象相同。 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.