在MAMI使用Kaos光谱仪进行相关的λ/σ电生产
Associated Lambda/Sigma electroproduction with the Kaos spectrometer at MAMI
摘要：
在德国美因茨核物理研究所的MAMI加速器的1.5 GeV电子束上，一台对奇异光和电产生至关重要的仪器是新安装的磁谱仪Kaos，它由A1合作组在质子或轻核的$(e,e'K)$反应中操作。其紧凑的设计和同时检测正负带电粒子的能力补充了现有的光谱仪。在2008 - 2009年期间，Kaos的奇异性计划正在解决基本K介子光生和电生反应领域的一些重要问题。虽然最近的测量已经在杰斐逊实验室进行，仍然有一些开放的问题，在解释的数据和描述的基本过程中使用唯象模型。通过在液氢靶产生K介子的质谱中识别出$Λ$和$Σ^0$超子，证明了MAMI的扩展装置能够在$Q^2$ <0.5（GeV/c）$^2$的低动量转移下进行奇异电产生谱。覆盖的运动学和系统的不确定性，从数据中提取的横截面进行了讨论。
英文摘要：
An instrument of central importance for the strangeness photo- and electroproduction at the 1.5-GeV electron beam of the MAMI accelerator at the Institut für Kernphysik in Mainz, Germany, is the newly installed magnetic spectrometer Kaos that is operated by the A1 collaboration in $(e,e'K)$ reactions on the proton or light nuclei. Its compact design and its capability to detect negative and positive charged particles simultaneously complements the existing spectrometers. The strangeness program performed with Kaos in 2008-9 is addressing some important issues in the field of elementary kaon photo- and electroproduction reactions. Although recent measurements have been performed at Jefferson Lab, there are still a number of open problems in the interpretation of the data and the description of the elementary process using phenomenological models. With the identification of $Λ$ and $Σ^0$ hyperons in the missing mass spectra from kaon production off a liquid hydrogen target it is demonstrated that the extended facility at MAMI is capable to perform strangeness electroproduction spectroscopy at low momentum transfers $Q^2$ < 0.5 (GeV/c)$^2$. The covered kinematics and systematic uncertainties in the cross-section extraction from the data are discussed.
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