$1.7 \le Q^2 \le 4.5 (GeV)^2$核子共振区中$\vev{e}p \to enπ^+$的截面和束流不对称性
Cross sections and beam asymmetries for $\vev{e}p \to enπ^+$ in the nucleon resonance region for $1.7 \le Q^2 \le 4.5 (GeV)^2$
摘要：
利用CEBAF大型接收光谱仪在光子虚度$Q^2 = 1.7 - 4.5 \rm{GeV^2}$范围内测量了排他性电生成过程$\vec{e}p \to e^\prime n π^+$，并对$W = 1.15 - 1.7 \rm{GeV}$的$nπ^+$系统进行了不变质量范围测量。第一次，这些运动学探讨独家$π^+$生产质子几乎完全覆盖的方位角和极角的$nπ^+$中心的质量系统。$nπ^+$通道对同位旋1/2激发核子态具有特别的灵敏度，并且与$pπ^0$终态一起将用于确定大量共振的跃迁形状因子。这些结果与现有模式之间的最大差异见于$σ_{LT'}$结构功能。在该实验中，测量了31，295个横截面和4，184个不对称数据点。由于大量的数据，只有一组减少的结构函数和勒让德多项式矩，可以在模型无关的拟合微分截面。
英文摘要：
The exclusive electroproduction process $\vec{e}p \to e^\prime n π^+$ was measured in the range of the photon virtuality $Q^2 = 1.7 - 4.5 \rm{GeV^2}$, and the invariant mass range for the $nπ^+$ system of $W = 1.15 - 1.7 \rm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive $π^+$ production from protons with nearly full coverage in the azimuthal and polar angles of the $nπ^+$ center-of-mass system. The $nπ^+$ channel has particular sensitivity to the isospin 1/2 excited nucleon states, and together with the $pπ^0$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the $σ_{LT'}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
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