论文标题
用观众核标记的偏振电子 - 脱氧
Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging
论文作者
论文摘要
背景：在极化的杜特隆上进行的磁盘，检测到核破裂区域中的质子（观众标记）代表了一种提取中子自旋结构功能和研究核修饰的独特方法。标记的质子动量控制在DIS过程中的核构型，并可以对核效应进行差异分析。如果可以实现Deuteron束极化，则可以使用未来的电子离子对撞机（EIC）和正向质子检测器进行此类测量。 目的：用观众标记为极化杜特隆开发理论框架。制定中子自旋结构提取的程序。 方法：协变旋转密度矩阵形式主义用于描述对撞机实验中的一般杜特隆极化（矢量/张量，纯/混合）。光（LF）量子力学用于在DIS过程中对核和核能结构进行分解。 LF自旋结构的4维表示用于构建极化的Deuteron LF波函数并有效评估自旋总和。使用标记的质子动量中的脉冲近似和分析性提取自由中子结构（极点外推）。 结果：对撞机实验中两极分标记的dis可观察物的一般表达。极化Deuteron LF光谱功能和核子动量分布的分析和数值研究。从标记的Deuteron自旋不对称中提取中子自旋结构的实用程序。 结论：观众标记为精确中子自旋结构测量提供了新的工具。可以通过标记的质子动量依赖性消除D波去极化和核结合效应。这些方法可以扩展到张量化的可观测值，自旋轨道效应和衍射过程。
Background: DIS on the polarized deuteron with detection of a proton in the nuclear breakup region (spectator tagging) represents a unique method for extracting the neutron spin structure functions and studying nuclear modifications. The tagged proton momentum controls the nuclear configuration during the DIS process and enables a differential analysis of nuclear effects. Such measurements could be performed with the future electron-ion collider (EIC) and forward proton detectors if deuteron beam polarization could be achieved. Purpose: Develop theoretical framework for polarized deuteron DIS with spectator tagging. Formulate procedures for neutron spin structure extraction. Methods: A covariant spin density matrix formalism is used to describe general deuteron polarization in collider experiments (vector/tensor, pure/mixed). Light-front (LF) quantum mechanics is employed to factorize nuclear and nucleonic structure in the DIS process. A 4-dimensional representation of LF spin structure is used to construct the polarized deuteron LF wave function and efficiently evaluate the spin sums. Free neutron structure is extracted using the impulse approximation and analyticity in the tagged proton momentum (pole extrapolation). Results: General expressions of the polarized tagged DIS observables in collider experiments. Analytic and numerical study of the polarized deuteron LF spectral function and nucleon momentum distributions. Practical procedures for neutron spin structure extraction from the tagged deuteron spin asymmetries. Conclusions: Spectator tagging provides new tools for precise neutron spin structure measurements. D-wave depolarization and nuclear binding effects can be eliminated through the tagged proton momentum dependence. The methods can be extended to tensor-polarized observables, spin-orbit effects, and diffractive processes.
