CLAS上$\vec{e}p \to e'K^+\vecΛ$和$\vec{e}p \to e'K^+\vecΣ^0$反应中核子共振区的束-反冲极化转移
Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $\vec{e}p \to e'K^+\vecΛ$ and $\vec{e}p \to e'K^+\vecΣ^0$ Reactions at CLAS
摘要：
在Jefferson实验室用CLAS光谱仪测量了$\vec{e}p \to e'K^+ \vecΛ,\vecΣ^0$反应的电子束反冲转移极化。在4.261和5.754 GeV的束流能量下完成了新的测量，测量范围涵盖了从0.7到5.4 GeV的动量转移$Q^2$ $^2$，从1.6到2.6 GeV的不变能量$W$，以及$K^+$介子的完整质心角范围。这些新的数据添加到现有的CLAS $K^+Λ$测量在2.567 GeV，并提供了有史以来第一次的数据$K^+Σ^0$通道的电生产。比较的数据与几个理论模型被用来研究的敏感性，s-通道共振贡献和潜在的反应机制。在两个半经典的部分子模型的解释，以探讨潜在的反应机制和$s\bar{s}$夸克对创建动力学。
英文摘要：
Beam-recoil transferred polarizations for the exclusive $\vec{e}p \to e'K^+ \vecΛ,\vecΣ^0$ reactions have been measured using the CLAS spectrometer at Jefferson Laboratory. New measurements have been completed at beam energies of 4.261 and 5.754 GeV that span a range of momentum transfer $Q^2$ from 0.7 to 5.4 GeV$^2$, invariant energy $W$ from 1.6 to 2.6 GeV, and the full center-of-mass angular range of the $K^+$ meson. These new data add to the existing CLAS $K^+Λ$ measurements at 2.567 GeV, and provide the first-ever data for the $K^+Σ^0$ channel in electroproduction. Comparisons of the data with several theoretical models are used to study the sensitivity to s-channel resonance contributions and the underlying reaction mechanism. Interpretations within two semi-classical partonic models are made to probe the underlying reaction mechanism and the $s\bar{s}$ quark-pair creation dynamics.
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