Constraints on Physics Beyond the Standard Model from Lower Energy Electron Scattering

低能电子散射对物理超出标准模型的限制

基本信息

批准号：
350361296
负责人：
Professor Dr. Hubert Spiesberger
金额：
--
依托单位：
Institut für Kernphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/350361296?language=en
关键词：
Constraints Physics Beyond Standard Model

项目摘要

We propose to study theoretical predictions for polarized electron-C12 scattering. A corresponding measurement was suggested to be performed at the Mainz Energy-Recovering Superconducting Accelerator, MESA. This could provide a high-precision determination of the weak mixing angle, as well as constraints on physics beyond the Standard Model. Our aim is to lay out the theoretical foundation and calculate predictions within the Standard Model of particle physics for the parity-violating polarization asymmetry as well as to study the sensitivity to physics beyond the Standard Model. The results obtained from the theoretical work suggested in this research proposal will define the physics case of such a measurement.We envisage three connected work packages: A: To obtain theory predictions within the Standard Model for the parity violating spin asymmetry in electron-C12 scattering including all possible sources of uncertainties due to higher-order perturbative corrections and nuclear form factor effects; B: To study the sensitivity to effective four-fermion operators, taking into account the interplay with and impact on complementary searches of other electron (positron) and neutrino scattering as well as neutrino oscillation experiments; C To determine quark masses and their uncertainties through the application of QCD sum rules and thus obtain one of the ingredients feeding into the calculation of the low-energy weak mixing angle needed within work package A.

我们建议研究极化电子 C12 散射的理论预测。建议在美因茨能量回收超导加速器（MESA）进行相应的测量。这可以提供弱混合角的高精度确定，以及超出标准模型的物理约束。我们的目标是在粒子物理标准模型中奠定理论基础并计算对宇称破坏偏振不对称性的预测，并研究标准模型之外的物理敏感性。从本研究提案中提出的理论工作中获得的结果将定义这种测量的物理情况。我们设想三个相互关联的工作包： A：在电子 C12 散射中宇称破坏自旋不对称性的标准模型内获得理论预测包括由于高阶微扰校正和核形状因子效应而导致的所有可能的不确定性来源； B：研究对有效四费米子算子的敏感性，考虑与其他电子（正电子）和中微子散射以及中微子振荡实验的互补搜索的相互作用和影响； C 通过应用QCD求和规则来确定夸克质量及其不确定性，从而获得工作包A中所需的低能弱混合角计算的成分之一。