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Electroweak Interactions and Fundamental Symmetries in Effective Field Theories

有效场论中的电弱相互作用和基本对称性

基本信息

批准号：
2111426
负责人：
Lucas Platter
金额：
$ 30万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-15 至 2025-07-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2111426&HistoricalAwards=false
关键词：
Electroweak Interactions Fundamental Symmetries Effective

项目摘要

Atoms are composed of the positively charged nucleus and negatively charged electrons. The nucleus itself is made up of protons and neutrons. The properties of nuclei are an important aspect of our understanding of the universe, such as big bang nucleosynthesis or stellar evolution. In addition, experiments with nucleons can inform us about the fundamental forces that exist in nature. Nucleons, however, are composite particles themselves built from elementary particles called quarks and gluons and have therefore a finite size. This feature complicates the modeling of the nuclear interaction and of the determination of uncertainties that are important to interpret possible disagreements between theoretical calculations and experiments. This project will use a tool called effective field theory to calculate how nuclear systems interact with the weak and electromagnetic interaction and provide predictions for a number of important experimentally relevant observables. Effective field theory is one tool that can provide reliable uncertainty estimates and it will be used to reduce uncertainties on a number of important observables. This work will thereby also improve our understanding of the nuclear interaction.This project aims at improving the understanding of electroweak processes using effective field theory (EFT). EFT is a systematic expansion in a ratio dictated by a system-inherent scale separation. The PI will use two EFTs, the EFT for short-range interactions (SREFT) and chiral EFT (CEFT). The PI and his collaborators will calculate structure functions for the 3-nucleon system using SREFT and CEFT. In turn, that will allow for improved predictions for nuclear corrections to the hydrogen spectrum that will be used to connect atomic physics experiments with nuclear physics properties. With the SREFT the PI will consider electric dipole moments (EDM) and try to understand how the Coulomb interaction and finite range effects impact the EDM form factors. Here, SREFT provides a guide to understanding the renormalization/uncertainties for such a calculation that, through experiments, can provide possible insights into features of physics beyond the standard model.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

原子由带正电的原子核和带负电的电子组成。原子核本身是由质子和中子组成的。原子核的性质是我们理解宇宙的一个重要方面，例如大爆炸核合成或恒星演化。此外，核子实验可以告诉我们自然界中存在的基本力。然而，核子本身是由称为夸克和胶子的基本粒子构成的复合粒子，因此具有有限的大小。这一特征使得核相互作用的建模和不确定性的确定变得复杂，而这些不确定性对于解释理论计算和实验之间可能存在的分歧是很重要的。该项目将使用一种称为有效场论的工具来计算核系统如何与弱相互作用和电磁相互作用相互作用，并为一些重要的实验相关观测值提供预测。有效场论是一种可以提供可靠的不确定性估计的工具，它将被用来减少一些重要的可观测量的不确定性。这项工作也将提高我们对核相互作用的理解。本项目的目的是利用有效场论（EFT）提高对电弱过程的理解。EFT是一种系统性的扩展，其比例由系统固有的尺度分离决定。PI将使用两种EFT，即短程相互作用EFT（SREFT）和手性EFT（CEFT）。PI和他的合作者将使用SREFT和CEFT计算3核子系统的结构函数。反过来，这将允许改进对氢光谱的核修正的预测，这将用于将原子物理实验与核物理性质联系起来。通过SREFT，PI将考虑电偶极矩（EDM），并尝试了解库仑相互作用和有限范围效应如何影响EDM形状因子。在这里，SREFT为理解这种计算的重整化/不确定性提供了指导，通过实验，可以提供对标准模型之外的物理特性的可能见解。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。