Measurements of H(->WW)+jets with the ATLAS detector

使用 ATLAS 探测器测量 H(->WW) 射流

• 批准号: 2112430
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2112430
• 关键词: Measurements; WW; +jets; ATLAS; detector

Using data produced by the Large Hadron Collider and collected by the ATLAS detector, differential cross sections of H(->WW)+jets will be measured and interpreted in the context of an effective field theory. The measurements will be optimized for the separation of various production channels: gluon fusion, vector-boson fusion, and VH production. The impact of the background subtraction on the interpretation will be studied, and the results will be combined with other Higgs boson measurements. Broader interpretations of flavour violation and specific new resonances or models will be investigated. The programme will begin with a detailed study of the identification of b-quarks produced in the top-quark decay, as this provides the dominant background to H(->WW)+jets. The study will focus on improving existing algorithms to increase the efficiency for b-quark identification so as to maximize the top-quark rejection. Steps will then be taken to calibrate the Monte Carlo modelling of this efficiency using top-quark data.The improved b-quark identification will subsequently be incorporated into the existing H(->WW) measurement framework, and a method will be devised to determine the residual top-quark background using the calibrated b-tagging algorithm. The dependence of the event selection on effective operators affecting both H(->WW)+jets and top-quark production will be investigated, and several selections will be chosen to maximize global sensitivity to the operators. Measurements of cross sections in these regions will be performed both inclusively and differentially, and combined with other measurements from ATLAS to globally constrain operators at a given order in the effective field theory. Separate studies will be performed to investigate potential flavour-dependent processes and specific resonances that significantly affect the operators relevant to H(->WW)+jets production.

使用大型强子对撞机产生并由地图集检测器收集的数据，将在有效的田间理论的背景下测量和解释H（ - > ww）+JET的差异截面。这些测量值将针对各种生产通道的分离进行优化：Gluon融合，矢量 - 玻璃融合和VH生产。将研究背景减法对解释的影响，结果将与其他希格斯玻色子测量结果结合使用。将研究对风味违规和特定新共鸣或模型的更广泛的解释。该程序将以详细的研究开始，该研究对顶级衰减中产生的B Quarks的识别，因为这为H（ - > ww）+Jets提供了主要背景。该研究将着重于改善现有算法以提高B Quark识别效率，以最大程度地提高Quark排斥。然后将采取步骤使用顶级数据来校准该效率的蒙特卡洛建模。随后将改进的B Quark识别识别将纳入现有的H（ - > ww）测量框架中，并将设计一种方法，以确定使用校准的B-Tagagging AlgorithM来确定残留的Topual Top-Quark背景。将研究事件选择对影响H（ - > ww）+Jets和Top-Qarark生产的有效操作员的依赖性，并将选择几种选择以最大程度地提高对操作员的全球敏感性。这些区域中的横截面的测量将在包含和差异上进行，并与从ATLAS到全球限制的其他测量值在有效的田间理论中以给定的顺序结合使用。将进行单独的研究，以研究潜在的风味依赖性过程和特定共振，这些过程显着影响与H（ - > ww）+JETS生产相关的操作员。