Searching for new charm baryon states in LHCb Run 2 data

在运行1和运行2期间，LHCb实验收集了9 fb^-1的数据。虽然LHCb探测器最初设计用于研究和搜索CP违和，以及b和c强子的稀有和禁止衰变，但LHCb也能够发现几种新的常规（基态，激发态）和奇异强子（五夸克，四夸克）。我的项目目前集中在寻找激发态的迷人重子Xic*+衰变为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，我们很有可能会发现一个或多个同位旋伙伴。已经有了一些现有的数据，并且从以前的分析中获得了大量的经验。同时，将执行一个单独的分析，旨在测量Run 3早期数据中一组迷人强子的生产横截面。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。Run 3的早期数据预计在2022年中期，因此该分析将主要使用模拟样本进行规划。（这种方法在Run 2早期测量项目中非常有效。）最后，该项目包括一个探测器研发组件，致力于设计和开发一个全新的LHCb子探测器——“强力追踪器”。这可能包括参与-测试光束软件和数据分析，以表征将构成探测器主要有效元件的CMOS芯片-开发真实的探测器模拟算法和规划最终数据格式。也可能有一个硬件组件，与爱丁堡大学的工程师和其他工作人员一起工作，完成数据读出链中的关键研发任务。

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.