Higgs physics using tau leptons with the ATLAS experiment at the CERN LHC

CERN LHC 的 ATLAS 实验中使用 tau 轻子的希格斯物理学

• 批准号: 2264680
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2264680
• 关键词: Higgs; physics; using; tau; leptons

It's possible that the 125 GeV Higgs boson discovered by the ATLAS and CMS Experiments is only one of several neutrally-charged Higgs bosons predicted by theories beyond the Standard Model of particle physics. Many of these theories predict the existence of a more massive Higgs boson, H, that is able to decay into two lighter 125 GeV Higgs bosons. The student will develop analysis strategies to search for the production of two neutral 125 GeV Higgs bosons (H to hh), and then carry out these search strategies on the ATLAS proton-proton collision data. Searches will focus on a final state where one of the Higgs bosons decays into two tau leptons, and the second Higgs boson decays to a pair of bottom quarks. The student will use this same final state to explore the Higgs boson self-coupling (h to hh), one of the last unobserved predictions of the Standard Model . The student will participate in developing algorithms for tau lepton identification, and will also be expected to play a role in the production of silicon microstrip detector modules for the ATLAS Phase-II tracker Upgrade (ITk).

ATLAS 和 CMS 实验发现的 125 GeV 希格斯玻色子可能只是粒子物理标准模型之外的理论预测的几种带中性电荷的希格斯玻色子之一。其中许多理论预测存在质量更大的希格斯玻色子 H，它能够衰变成两个更轻的 125 GeV 希格斯玻色子。学生将制定分析策略来搜索两个中性 125 GeV 希格斯玻色子（H 至 hh）的产生，然后在 ATLAS 质子-质子碰撞数据上执行这些搜索策略。搜索将集中在最终状态，其中一个希格斯玻色子衰变成两个 tau 轻子，第二个希格斯玻色子衰变成一对底夸克。学生将使用相同的最终状态来探索希格斯玻色子自耦合（h 到 hh），这是标准模型最后未被观测到的预测之一。该学生将参与开发 tau 轻子识别算法，并有望在 ATLAS 第二阶段跟踪器升级（ITk）的硅微带探测器模块的生产中发挥作用。