反冲质子极化：一种新的判别性DVCS观测
The Recoil Proton Polarization: a new discriminative DVCS observable
摘要：
广义部分子分布描述了核子中夸克和胶子的纵动量与横位置之间的关联。它们可以通过测量由Bethe-Heitler和Deeply虚康普顿散射过程之间的干涉产生的光子leptoproduction观测值来约束。在超前扭转/超前阶次处，后者的幅度由GPD {H，E，H，E}的复积分参数化。由于在非极化或纵向极化目标上收集的数据约束H和H，因此E知之甚少，因为它需要用横向极化目标收集的数据，这在固定目标实验中实施非常具有挑战性。到目前为止，唯一考虑的替代方案是氘靶中子上的DVCS，同时假设同位旋对称性和不存在终态相互作用。今天，我们介绍的反冲质子的偏振作为一个新的DVCS观察，高度敏感的E，这似乎是可行的实验研究在高光度的设施，如杰斐逊实验室。
英文摘要：
Generalized parton distributions describe the correlations between the longitudinal momentum and the transverse position of quarks and gluons in a nucleon. They can be constrained by measuring photon leptoproduction observables, arising from the interference between Bethe-Heitler and Deeply virtual Compton scattering processes. At leading-twist/leading-order, the amplitude of the latter is parameterized by complex integrals of the GPDs {H, E, H, E} . As data collected on an unpolarized or longitudinally polarized target constrains H and H, E is poorly known as it requires data collected with a transversely polarized target, which is very challenging to implement in fixed target experiments. The only alternative considered so far has been DVCS on a neutron with a deuterium target, while assuming isospin symmetry and absence of final-state interactions. Today, we introduce the polarization of the recoil proton as a new DVCS observable, highly sensitive to E, which appears feasible for an experimental study at a high-luminosity facility such as Jefferson Lab.
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