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

电动对称性破坏的一个重要测试是建立Higgs玻色子自耦合（_HHH）的证据，该证据与Higgs电位的形状直接相关。这可以通过测量希格斯玻色子对生产来实现。 Cern Atlas和CMS实验发现的125个GEV Higgs玻色子也可能只是粒子物理学标准模型以外的理论所预测的几个中性荷里的希格斯玻色子之一。这些理论中的许多理论预测了一个更庞大的希格斯玻色子的存在，该玻色子能够腐烂成两个较轻的125 Gev Higgses，它们可以在Di-Higgs不变的质谱中作为共鸣。标准模型以外的某些物理学还可以以非谐振方式增强Di-Higgs生产横截面。该学生将制定分析策略，以搜索两个中性125 GEV Higgs玻色子的生产，然后使用Atlas Run-3 13.6 TEV Proton-Proton碰撞数据进行_HHH的测量。搜索将集中在最终状态下，其中一个希格斯玻色子腐烂了两个tau lepton，第二个希格斯玻色子腐烂到了两对底夸克。作为本搜索的关键要素，学生将参与开发tau Lepton识别算法。该学生还将有机会在Atlas Di-Higgs搜索渠道的统计组合中发挥领导作用。通过协助ATLAS Tracker升级的硅模块构建也有可能进行动手探测器工作，该升级计划在LHC的Run-3之后安装