Study of charm mixing with the LHCb experiment and development of a TORCH detector

LHCb 实验粲混合研究及 TORCH 探测器的开发

• 批准号: 2275240
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275240
• 关键词: Study; charm; mixing; LHCb; experiment; Study; charm; mixing; LHCb; experiment

Jennifer's DPhil research will involve two main aspects: (i) the study of charm mixing through the analysis of data collected at the LHCb experiment at CERN, and the preparation for run 3 studies with the upgraded experiment; (ii) the development of TORCH, a novel Time-of-Flight detector, suitable for installation at LHCb or other future experiment.Charm mixing is a phenomenon that has only been observed in the last ~5 years, and still warrants more precise study. Generally charm mixing has been analysed in two-body decays of neutral charm mesons (D0 mesons). Jennifer will perform a study using the four-body decay mode D0->Kpipipi using the combined run 1 and run 2 data sets of the LHCb experiment. A multibody study of this nature is valuable as it is sensitive to the effects of intermediate resonances in the decay. Not only will the analysis be the first of its kind with such a large data set, but the measurement will for the first time be performed in bins of phase space, which will bring additional sensitivity, and will also provide information that is necessary for the measurement of the CP-violating phase gamma. LHCb is currently in shutdown, and is undergoing extensive upgrade in preparation for the resumption of data taking in 2021. Jennifer will be based at CERN for this important phase of the experiment, and will assist in operating and commissioning the new experiment. It is intended she will perform a pilot analysis with the initial data that will be collected. The nature of this study will be determined closer to the time, but it will not require the sophistication of her baseline analysis, and therefore will be completed in a timely fashion.In addition to the LHCb physics studies, Jennifer will work on the research and development for the TORCH time of-flight-detector. The work will involve preparing for future test-beam measurements of an existing TORCH module, a quartz plate of 125 x 66 x 1 cm with focussing optics and 11 photon detectors, and developing code for the analysis of the data. She will start her work by analysing already existing TORCH data comprising only 2 photon detectors, studying photon counting as a function of photon path length in the quartz radiator, and also verifying the timing performance for multiple photon reflections. The timing resolution and photon yields will then be compared to simulated performance. Jennifer's work will result in the verification of TORCH as a future sub-detector element for the LHCb experiment, providing pi/K particle identification capabilities up to 10 GeV/c. In conjunction with this work, Jennifer will work in collaboration with the Photek Company (Hastings, UK), who have developed the current TORCH MCP-PMT photon detectors. Resulting from her studies, future improvements of the MCP-PMTs can be achieved, and lead to possible marketing opportunities for UK industry.

詹妮弗（Jennifer）的DPHIL研究将涉及两个主要方面：（i）通过分析CERN的LHCB实验中收集的数据进行魅力混合的研究，以及通过升级的实验进行3项RUN研究的准备； （ii）Torch的开发是一种新型飞行时间检测器，适用于LHCB或其他未来实验的安装。Charm混合是一种仅在过去〜5年中才观察到的现象，仍然需要更精确的研究。通常已经在中性魅力介子（D0介子）的两体衰减中分析了魅力混合。詹妮弗（Jennifer）将使用四体衰减模式D0-> kPipi使用组合运行1并运行2个LHCB实验的数据集进行研究。对这种性质的多体研究非常有价值，因为它对衰减中中间共振的影响很敏感。分析不仅将是如此大的数据集，而且测量值将首次在相空间中进行，这将带来额外的敏感性，还将提供用于测量CP竞争相伽玛所必需的信息。 LHCB目前正在关闭，并且正在进行大量升级，以准备恢复2021年的数据。Jennifer将基于CERN进行实验的这一重要阶段，并将协助运营和调试新实验。她的意图将对将收集的初始数据进行试点分析。这项研究的性质将更接近时间，但它不需要她的基线分析的复杂性，因此将及时完成。在LHCB物理学研究中，Jennifer将在Flight-dectector的Torch时间进行研究和开发。这项工作将涉及准备现有火炬模块的将来的测试梁测量，即具有重点光学元件和11个光子检测器的125 x 66 x 1 cm的石英板，以及为数据分析的代码。她将通过分析仅有2个光子检测器的现有火炬数据来开始工作，研究光子对石英散热器中光子路径长度的函数研究，并验证多个光子反射的定时性能。然后将定时分辨率和光子屈服与模拟性能进行比较。詹妮弗（Jennifer）的工作将导致火炬作为LHCB实验的未来子检测元素的验证，从而提供高达10 GEV/c的PI/K粒子识别能力。詹妮弗（Jennifer）将与这项工作一起与Photek Company（Hastings，UK）合作，后者开发了当前的MCP-PMT光子探测器。由于她的学习，可以实现MCP-PMT的未来改进，并为英国行业带来营销机会。