Searching for Exclusive W decays in ttbar events using the ATLAS detector at the Large Hadron Collider

使用大型强子对撞机上的 ATLAS 探测器搜索 ttbar 事件中的专有 W 衰变

• 批准号: 2893641
• 金额: --
• 依托单位: Lancaster University
• 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-2893641
• 关键词: Searching; Exclusive; decays; ttbar; events

Exclusive hadronic decays of the W-boson are predicted by the Standard Model but have never been observed. Depending on the decay mode, the expected branching fractions could be as high as 1 per million. This project aims to exploit the large sample of > 100 million top-quark-pair production events available from Run 2 of the LHC to search for such decays, as well as new similarly sized datasets from Run 3. Each top quark decays to a bottom quark and W-boson. Exclusive W decay events can then be searched for by requiring that one W Boson decays to a charged lepton and neutrino and then studying the decay of the other W boson. The precise selection of which decay modes to study will be determined during the Ph.D, but initial candidate decays are: i) W+-> rho_0 + pi+/rho+, ii) W+-> D_s + gamma , iii) W-+> D0 pi+/rho+, iv) W+ -> D_s + J/Psi . In addition to analysis of ttbar datasets, it is planned to study and develop dedicated triggers for exclusive decays in direct W production as part of this Ph.D. project. If successfully deployed these could potentially enhance the searchable sample of W bosons by two orders of magnitude compared to the top-quark pair production dataset.

标准模型预测了W-Boson的独家习惯衰变，但从未观察到。根据衰减模式，预期的分支分数可能高达100万。该项目旨在利用LHC的2次运行2的最高Quark Pair生产活动的大量样本来搜索此类衰减，以及从3运行中的3个类似尺寸的数据集。每个顶级的Quark腐烂到底部的Quark和W-Boson。然后，可以通过要求一个W玻色子腐烂到带电的Lepton和Neutrino，然后研究另一个W玻色子的衰减，从而搜索独家的W衰减事件。在PH.D期间将确定要研究的衰减模式的精确选择，但是最初的候选衰减为：i）W+ - > rho_0+pi+/rho+，ii）W+ - > d_s+gamma，iii，iii）W - +>+> d0 pi+/rho+/rho+，iv，iv，iv）w+ - > d_s+ - > d_s+j/psi。除了对TTBAR数据集的分析外，还计划研究和开发专门的触发器作为该博士学位的一部分，以直接生产的独家衰减。项目。如果成功部署，与Top-Quark对生产数据集相比，这些可能会增加两个数量级的可搜索的W玻色子样本。