ATLAS Bridging Application: Are Leptoquarks the Ultimate Answer?

ATLAS 桥接应用：轻夸克是最终答案吗？

• 批准号: SAPPJ-2019-00048
• 负责人: Ilic, Nikolina
• 金额: $ 9.47万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=739457
• 关键词: ATLAS; Bridging; Application; Leptoquarks; Ultimate

Although the Standard Model (SM) is an accurate description of the fundamental particle physics laws, it leaves many questions unanswered. These questions are related to the nature of dark matter, the lack of anti-matter in the universe, and the possible unification of the known forces. Addressing these mysteries requires merging our current understanding of seemingly disconnected theories into a single framework, known as the Theory of Everything (ToE). Most collider experiments have not yielded deviations from the SM, which would provide support of new models that lead to a ToE. There is one prominent deviation from the SM seen in past and present experiments that has the potential to address unanswered questions. The SM states that the different families of leptons behave similarly. However, several measurements performed by the Belle, BaBar and LHCb experiments indicate that this might not be the case. There is a 1/15 000 probability that these results are due to a statistical fluctuation in the data. This suggests the possibility that new physics beyond the SM is responsible for these observations. The leading theoretical explanation is the existence of Leptoquarks. Leptoquarks are predicted by beyond SM theories which aim to unify our current knowledge into a single Theory of Everything. I propose to perform the first dedicated ATLAS search for Leptoquarks decaying to top quarks and tau leptons. The top and tau particles decay to various combinations of b-quarks, electrons/muons with neutrinos and lighter quarks. My work on many analyses containing these final states have provided me with unique expertise to perform this search. In addition, I propose to work on upgrades to the ATLAS detector that are critical for the measurement of these final states. ATLAS will be upgraded in 2019 in order to keep up with increasingly demanding Large Hadron Collider (LHC) operating conditions. The upgrades include the addition of a tracking system (Fast TracKer - FTK), improvements to the electromagnetic calorimeter, and additional muon chambers, called the New Small Wheel (NSW). Having worked on the FTK, I have plans on how to improve b-quark and tau lepton measurements. I further propose to focus on the electron and muon improvements by installing and commissioning a readout system, called FELIX, for the electromagnetic calorimeter and NSW. As one of the experts in the installation and integration of complicated electronics systems into ATLAS, I can ensure the successful installation of the FELIX readout. This FELIX project is complimentary to Canadian ATLAS hardware projects, since it will be used to readout the electromagnetic calorimeter, NSW and Inner TracKer (ITK), all of which are large scale Canadian efforts.

尽管标准模型（SM）是对基本粒子物理定律的准确描述，但它留下了许多未解决的问题。这些问题与暗物质的本质，宇宙中缺乏反物质以及已知力量的统一有关。解决这些谜团需要将我们当前对看似分离的理论的理解融合到一个单一的框架中，被称为一切（脚趾）的理论。大多数对撞机的实验尚未与SM产生偏差，这将提供导致脚趾的新模型的支持。与过去和现在实验中看到的SM有一个突出的偏差，有可能解决未解决的问题。 SM指出，不同家族的瘦人家族的行为类似。但是，Belle，Babar和LHCB实验进行的几项测量表明，情况并非如此。这些结果的概率是1/15 000的概率是由于数据中的统计波动。这表明，SM超出SM的新物理学可能是这些观察结果的可能性。 领先的理论解释是Leptoquarks的存在。 Leaptoquarks是通过超越SM理论来预测的，旨在将我们当前的知识统一为一切理论。我建议在顶级夸克和tau leptons上进行第一个专用的Atlas搜索leptoquarks。顶部和tau颗粒腐烂到B夸克，具有中微子和较轻夸克的各种组合。我对包含这些最终状态的许多分析的工作为我提供了独特的专业知识来执行此搜索。此外，我建议对ATLAS检测器进行升级，这对于测量这些最终状态至关重要。地图集将在2019年升级，以跟上越来越苛刻的大型强子对撞机（LHC）操作条件。升级包括添加跟踪系统（快速跟踪器-FTK），对电磁热量计的改进以及称为新的小轮（NSW）的其他MUON腔室。在FTK上工作后，我制定了如何改善B Quark和Tau Lepton测量的计划。我进一步建议通过安装和调试称为Felix的读数系统（用于电磁热量计和NSW）来重点关注电子和MUON的改进。作为将复杂的电子系统安装和集成到Atlas中的专家之一，我可以确保成功安装Felix读数。这个Felix项目对加拿大Atlas硬件项目是免费的，因为它将用于读取电磁热量表，新南威尔士州和内部跟踪器（ITK），所有这些都是加拿大大型努力。