Time-dependent CP violation measurement with B Dpi decays and development of simulation software for the Mighty Tracker (LHCb Upgrade II)

B Dpi 衰减的时间相关 CP 违规测量以及 Mighty Tracker 模拟软件的开发（LHCb 升级 II）

• 批准号: 2781437
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2781437
• 关键词: Time; dependent; CP; violation; measurement

The student will perform a time-dependent CP violation measurement with B0-->D- pi+ decays. The focus of the student will be on the flavour tagging for this mode, followed by the measurement and the evaluation of the systematic uncertainties. In order to successfully study the the CP violating properties of the B0 meson, in the D- pi+ decay channel, the flavour of the meson at the time of its productionmust be known. In order to determine this information the particles produced in association with this meson can be studied. Algorithms which aim to make determinations use a variety of tools such as BDTs and NNs to identify key markers, such as the charge of leptons produced on the opposite side of the beam or pions produced on the same side. These algorithms then provide an initial tagging decision and a mistag probability which must then be calibrated using control samples.Upgrade II Mighty Tracker Digitisation MonitoringA vital step in the development of a new detector is its simulation. Accurate and robust simulation allows for good predictions of the physics performance and possible changes that need to be made. Part of the complete simulation is the digitisation step. This step takes raw simulation data from the generation phase of the simulation and transforms it into what would be possibly be output from the real detector. In order to assess the output of this phase of the simulation the information must be translated into a more understandable format such as histograms. This is the goal of the digitisation monitors.

学生将用B 0--> D-pi+衰变来测量随时间变化的CP破坏。学生的重点将是对这种模式的风味标记，其次是测量和系统的不确定性的评估。为了成功地研究D π ~+衰变道中B_0介子的CP破坏性质，必须知道介子产生时的味。为了确定这一信息，可以研究与该介子有关的粒子。旨在进行确定的算法使用各种工具，如BDT和NN来识别关键标记，例如在束的另一侧产生的轻子或在同一侧产生的π介子的电荷。这些算法提供了一个初始的标记决定和一个mistug概率，然后必须使用控制样本进行校准。升级II强大的跟踪器数字化验证新探测器开发的一个重要步骤是它的仿真。准确和稳健的模拟可以很好地预测物理性能和需要进行的可能更改。完整模拟的一部分是数字化步骤。该步骤从模拟的生成阶段获取原始模拟数据，并将其转换为可能从真实的检测器输出的数据。为了评估模拟这一阶段的输出，必须将信息转换为更易于理解的格式，如直方图。这就是数字化监视器的目标。