Research in Theoretical Hadronic Physics and Related Topics

我们将研究一些与强子物理有关的话题。强子物理是研究质子、中子、介子等的内部结构和相互作用的学科，它们本身也是原子核结构的组成部分。一个课题是计算光子和z -玻色子对宇称违反电子散射的贡献。这些贡献对于将这一过程的精确测量转化为核子奇夸克含量的测定是重要的。另一个主题是类时深虚康普顿散射，它是电子-正电子湮灭成光子加强子-反强子对的过程。目标是将测量结果与新区域的一般部分子分布联系起来，以更好地了解物质在强子内的分布。第三个主题是了解如何有效地结合弹性电子质子散射的双光子修正的两种不同分析。这些修正对于一种测量质子内带电物质分布的方法是很重要的。现存的两种计算各自解释了部分或大部分差异，但由于重复计算的问题，在没有更好地理解每种计算中的近似值之前，不能简单地将它们加在一起。另一个主题是横向动量依赖的部分子分布，这是一个相对较新的和潜在的重要信息来源的核子结构。我们将能够使用一个模型来计算一些数值上较小的部分子分布，这个模型对目标和束的自旋不对称都有指导意义。最后，在这个长而短的总结中，我们将进一步研究强子物理学可以从所谓的反散射空间-共形场论对应中学到什么。作为例子，我们将研究在不同的对应实现中推导维度标度定律，计算出从这种对应中预测的胶球谱，并将奇异粒子纳入模型。就更广泛的影响而言，这些项目将有助于弥合强子理论与实际数据之间的差距，并将为培养包括本科生在内的新学生提供材料。首席研究员有两名成功的女性博士生，目前的项目可能会扩大女性进入该领域的机会。此外，PI定期访问杰斐逊实验室，弥合大学和国家实验室之间的差距。

We will investigate a number of topic relevant to hadronic physics. Hadronic physics is the study of the internal structure and interactions of protons, neutrons, pi-mesons, etc., which are themselves components in the structure of atomic nuclei. One topic is to calculate the combined photon and Z-boson contributions to parity violating electron scattering. These contributions are important for translating precision measurements of this process into determinations of strange quark content of the nucleon. Another topic is timelike deeply virtual Compton scattering, which is the process of electron-positron annihilating into a photon plus a hadron-antihadron pair. The goal is to relate the measurements to general parton distributions in a new region, to better understand how matter is distributed within the hadron. A third topic is to understand how to usefully combine two different analyses of the two-photon corrections to elastic electron proton scattering. These corrections are important to one method of measuring the layout of charged matter within the proton. The two extant calculations each explain some to most of the discrepancy, but cannot without better understanding of the approximations in each calculation simply add them together because of double counting issues. Another topic is transverse momentum dependent parton distributions, which are a relatively new and potentially significant source of information on nucleon structure. We will be able to calculate some of the numerically smaller parton distributions using a model that has been instructive for both target and beam spin asymmetries. Finally for this long paragraph but short summary, we will further examine what hadronic physics can usefully learn from the so-called anti-deSitter space--conformal field theory correspondence. We will, as examples, look into deriving the dimensional scaling laws in different implementations of the correspondence, work out the glueball spectrum predicted form this correspondence, and include strange particles into the model.In terms of broader impacts, these projects will help bridge the gap between hadronic theory and actual data, and will provide material for training new students, including undergraduates. The principal investigator has had two successful women Ph.D. students, and the present project may extend opportunities for women entering the field. Also, the PI is regularly visiting the Jefferson Laboratory and bridging the gap between university and national labs.