论文标题
测量中级质子质子的广义极化能力$ q^2 $
Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$
论文作者
论文摘要
背景：广义极化能力（GPS）是描述核子结构的重要可观察物，这些可观察物的测量仍然很少。目的：本文通过研究$ e p \ to epγ$反应，介绍了在Mainz Microtron在A1设置上进行的虚拟康普顿散射（VC）实验的详细信息。本文着重于分析的某些方面。方法：实验提取了$ p_ {ll} -p_ {tt} /ε$和$ p_ {lt} $结构函数，以及质子的电气和磁性GPS，以四个新的值的三个新值$ q^2 $：0.10，0.20，0.20和0.45 GEV $：0.20和0.45 GEV $^2 $。结果：我们强调了实验参数校准的重要性。提出了测量的$ e p \ to epγ$横截面的行为，并将其与理论进行了比较。对极化性拟合的详细研究揭示了其复杂性的一部分，与低能扩张的高阶术语有关。结论：提出的方面是有助于最大程度地减少系统不确定性并提高物理结果精确度的要素。
Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce. Purpose: This paper presents details of a virtual Compton scattering (VCS) experiment, performed at the A1 setup at the Mainz Microtron by studying the $e p \to e p γ$ reaction. The article focuses on selected aspects of the analysis. Method: The experiment extracted the $P_{LL} -P_{TT} / ε$ and $P_{LT}$ structure functions, as well as the electric and magnetic GPs of the proton, at three new values of the four-momentum transfer squared $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$. Results: We emphasize the importance of the calibration of experimental parameters. The behavior of the measured $e p \to e p γ$ cross section is presented and compared to the theory. A detailed investigation of the polarizability fits reveals part of their complexity, in connection with the higher-order terms of the low-energy expansion. Conclusions: The presented aspects are elements which contribute to minimize the systematic uncertainties and improve the precision of the physics results.
