Searching for Higgs Boson Pair Production with the ATLAS Experiment at the CERN LHC

通过 CERN LHC 的 ATLAS 实验寻找希格斯玻色子对的产生

• 批准号: 2887509
• 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: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2887509
• 关键词: Searching; Higgs; Boson; Pair; Production

An important test of the electroweak symmetry breaking would be to establish evidence of the Higgs boson self-coupling (_hhh), which is directly linked to the shape of the Higgs potential. This can be accomplished through a measurement of Higgs boson pair production. It's also possible that the 125 GeV Higgs boson discovered by the CERN 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 that is able to decay into two lighter 125 GeV Higgses, which could appear as a resonance in the di-Higgs invariant mass spectrum. Some physics beyond the Standard Model could also enchance the di-Higgs production cross-section in a non-resonant manner. The student will develop analysis strategies to search for the production of two neutral 125 GeV Higgs bosons, and then carry out a measurement of _hhh using the ATLAS Run-3 13.6 TeV 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. As a key element of this search, the student will participate in developing algorithms for tau lepton identification. The student will also have the opportunity to play a leading role in the statistical combination of ATLAS di-Higgs search channels. There is also a possibility for hands-on detector work, by assisting with silicon module construction for the ATLAS tracker upgrade which is planned for installation following Run-3 of the LHC

电弱对称性破缺的一个重要测试是建立希格斯玻色子自耦合（_hhh）的证据，它与希格斯势的形状直接相关。这可以通过测量希格斯玻色子对的产生来实现。欧洲核子研究中心 ATLAS 和 CMS 实验发现的 125 GeV 希格斯玻色子也有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，它能够衰变成两个更轻的 125 GeV 希格斯玻色子，这可能在双希格斯不变质谱中表现为共振。标准模型之外的一些物理现象也可以以非共振方式增强双希格斯粒子产生截面。学生将制定分析策略来寻找两个中性 125 GeV 希格斯玻色子的产生，然后使用 ATLAS Run-3 13.6 TeV 质子-质子碰撞数据进行 _hhh 测量。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。作为这项研究的关键要素，学生将参与开发 tau 轻子识别算法。学生还将有机会在ATLAS di-Higgs搜索通道的统计组合中发挥主导作用。还可以通过协助 ATLAS 跟踪器升级的硅模块构建来进行探测器的实际工作，该跟踪器计划在大型强子对撞机第三次运行后安装