Optimising the ATLAS Level-1 Calorimeter Trigger and Top-Antitop Charge Asymmetry

优化 ATLAS 1 级热量计触发器和顶部-反顶部电荷不对称性

• 批准号: 1843685
• 金额: --
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1843685
• 关键词: Optimising; ATLAS; Level; Calorimeter; Trigger

The last year I have been working on a scenario where the luminosity at the ATLAS experiment becomes high enough that we need to apply harsher cuts on the trigger selection. I used a sample of background QCD jets (events we don't want to keep) and a sample of electrons from Z bosons (that we do want to keep) to reduce the rate of data-taking but keeping the efficiency as high as possible. A set of cuts were thus deduced and have been placed in the trigger menu which may be used for this year's running of the LHC.I am further involved with an analysis on top-antitop quark charge asymmetry. Here we are looking at the decay products of the two particles and observing their respective boosts (rapidities) in the detector to see if their values differ from those predicted by the Standard Model of Particle Physics. Some models beyond the Standard Model predict different behaviour. Currently, I am comparing methods which reconstruct the top quarks from their decay products, seeing how well they perform, using Monte-Carlo data to test them.My main thesis topic is yet to be decided but will be a larger analysis on top quarks, perhaps even a continuation of charge asymmetry with all of the LHC run 2 data.

去年我一直在研究一个场景，在ATLAS实验中，光度变得足够高，我们需要对触发选择进行更严格的削减。我使用了一个背景QCD喷流（我们不想保留的事件）和一个来自Z玻色子的电子样本（我们确实想保留）来降低数据采集的速度，但保持尽可能高的效率。一组削减，从而推导出，并已被放置在触发菜单，可能用于今年的运行LHC。我进一步参与了顶-反顶夸克电荷不对称性的分析。在这里，我们正在观察两种粒子的衰变产物，并在探测器中观察它们各自的增强（rapidities），看看它们的值是否与粒子物理学标准模型预测的值不同。标准模型之外的一些模型预测不同的行为。目前，我正在比较从衰变产物重建顶夸克的方法，看看它们的表现如何，使用蒙特-卡罗数据来测试它们。我的主要论文主题尚未确定，但将是对顶夸克的更大分析，甚至可能是对LHC运行2数据的电荷不对称性的延续。

项目成果

Inclusive and differential measurements of the charge asymmetry in ttbar events at 13 TeV with the ATLAS detector

使用 ATLAS 探测器对 13 TeV ttbar 事件中的电荷不对称性进行包容性和差分测量

• 发表时间: 2019
• 作者: ATLAS Collaboration