Searching for new charm baryon states in LHCb Run 2 data

在 LHCb Run 2 数据中寻找新的魅力重子态

• 批准号: 2468089
• 金额: --
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2468089
• 关键词: Searching; new; charm; baryon; states

The LHCb experiment has collected 9 fb^-1 of data during Run 1 and Run 2. While the LHCb detector was originally designed to study and search for CP Violation, and rare and forbidden decays of b and c hadrons, LHCb has also been able to discover several new states of conventional (ground, excited states) and exotic hadrons (penta-, tetra-quarks).My project is presently focused on searching for excited charmed baryons Xic*+ decaying into the Xic+ pi+ pi- state (and charge conjugate.) Based on the recent discovery of three neutral Xic* states in the Lambda_c+ K- channel, there is a good chance we will discover one or more of the isospin partners. There is already some existing data, and plenty of experience gained from previous analyses.In parallel, a separate analysis will be performed aiming to measure the production cross-sections of a suite of charmed hadrons in the early Run 3 data. In this case we can benefit from dedicated unbiased trigger lines while being able to provide crucial input to validate the entire data collection and analysis chain for what will effectively be a brand new LHCb detector. This early Run 3 data is expected in mid-2022, so this analysis will be planned with mainly simulated samples. (This approach worked very well in the Run 2 Early Measurement programme.)Finally, the project includes a Detector R&D component, working towards the design and development of a brand new LHCb subdetector - the "Mighty Tracker." This may include involvement in - Test beam software and data analysis to characterise the CMOS chips that will form the main active elements of the detector - Development of realistic detector simulation algorithms and planning for the final data format.There could also be a hardware component, working alongside engineers and other staff in the University of Edinburgh on key R&D tasks in the data readout chain.

LHCb实验在运行1和运行2期间收集了9 fb^-1的数据。虽然LHC B探测器最初设计用于研究和寻找CP破坏以及B和c强子的罕见和禁止衰变，但LHC B也能够发现常规强子（基态，激发态）和奇异强子（五夸克，四夸克）的几个新态。我的项目目前集中在寻找激发的粲重子Xic*+衰变到Xic+ pi+ pi-态（和电荷共轭）。基于最近在Lambda_c+ K通道中发现的三个中性Xic* 态，我们很有可能发现一个或多个同位旋伙伴。已经有一些现有的数据，以及从以前的分析中获得的大量经验。与此同时，将进行一个单独的分析，旨在测量早期运行3数据中一组粲强子的产生截面。在这种情况下，我们可以受益于专用的无偏触发线，同时能够提供关键的输入，以验证整个数据收集和分析链，这将有效地成为一个全新的LHCb探测器。该早期运行3数据预计将在2022年年中获得，因此计划主要使用模拟样本进行该分析。(This这种方法在运行2早期测量计划中非常有效。）最后，该项目包括一个探测器研发部分，致力于设计和开发一个全新的LHCb子探测器-“强大的跟踪器”。“这可能包括参与-测试束软件和数据分析，以验证将构成探测器主要有源元件的CMOS芯片-开发逼真的探测器模拟算法和规划最终数据格式。