Hadronic Physics for Fundamental Discoveries

强子物理的基本发现

基本信息

批准号：
1714253
负责人：
Emilie Passemar
金额：
$ 24万
依托单位：
Indiana University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2021-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714253&HistoricalAwards=false
关键词：
Hadronic Physics Fundamental Discoveries

项目摘要

Nuclear and particle physics aim to understand fundamental parameters and laws of nature at subatomic distances. Among such parameters are the masses of elementary particles: quarks and leptons. Quarks are particles that interact via the strong force -- this force binds them together in an atomic nucleus. Leptons do not feel this force; the most familiar example of a lepton is the electron that is bound to the nucleus by the electromagnetic interaction. A more exotic lepton is the neutrino, which has no electric charge and interacts only weakly. Yet, this elusive particle is proving to be a crucial link in our search for new physics. Exquisite experimental measurements over the last two decades have revealed that the neutrinos have small but nonzero masses, but the fundamental understanding of the quarks and lepton masses remains elusive. In this broader context, this project will provide the theoretical foundations needed in support of experimental efforts designed to measure with high accuracy the masses of the neutrinos and light quarks. This project will provide excellent training ground for students.An important challenge in nuclear and particle physics concerns the description of the strong force at low energy with the accuracy matching the experimental level of precision. Specifically, the aim of this project is to understand the three-pion system. This system is the final state of the decay of the eta-meson that is used for the light quark mass determination.This system is also an intermediate state of the neutrino-nucleus interaction and therefore plays an essential role in interpreting neutrino experiments. The PI and her collaborators will develop an analytical framework to accurately model three-pion interactions, based on the methods of chiral perturbation theory and dispersive techniques. This will support state-of-the-art nuclear physics experiments at Thomas Jefferson Laboratory, particularly GlueX or CLAS, as well as the upcoming precision neutrino-nucleus scattering experiments at Fermilab and worldwide.

核和粒子物理学旨在了解亚原子距离的基本参数和自然定律。此类参数包括基本颗粒的质量：夸克和叶子。夸克是通过强力相互作用的颗粒 - 这种力将它们结合在一起，以原子核us粘合在一起。钩子没有感觉到这种力量。 Lepton的最熟悉的例子是电子相互作用与核us结合的电子。更奇特的轻子是神经元，它没有电荷，仅相互作用弱。然而，这个难以捉摸的粒子在我们寻找新物理学的搜索中提供了至关重要的联系。在过去的二十年中，精致的实验测量表明，神经元的群体很小但非零的质量，但是对夸克和Lepton群众的基本理解仍然难以捉摸。在这种更广泛的背景下，该项目将提供所需的理论基础，以支持旨在高精度测量神经元和光夸克的质量。该项目将为学生提供良好的训练场。核和粒子物理学的重要挑战涉及对低能量下强力的描述与精度相匹配的精度。具体来说，该项目的目的是了解三铅系统。该系统是用于光夸克质量测定的Eta-Meson衰减的最终状态。该系统也是神经核核相互作用的中间状态，因此在解释神经元实验中起着至关重要的作用。 PI和她的合作者将根据手性扰动理论和分散技术的方法来开发一个分析框架，以准确地对三杆型相互作用进行建模。这将支持Thomas Jefferson实验室，尤其是Gluex或CLA的最新核物理实验，以及Fermilab和全球的即将到来的精确神经元核散射实验。