The measurement of the Unitarity Triangle, gamma, from neutral B0 mesons using the full LHCb Run I and II dataset

这个学生将专注于LHCb小组的旗舰测量单位三角形，伽马。在最初的18-20个月里，她将在D介子、Kpi、Kpinipi和可能的Kpii0的受抑制和伽马敏感的“ADS”模式中发展B0-gt；D0k*0的分析，所有这些模式都是由以前的D-Phil学生在类似的B-gt；D0h衰变的背景下开发的。已在LHCb Run I数据集中搜索KPI模式，但尚未尝试其他两个最终状态。从Run I和Run II数据的组合中预计会有好的信号，很容易在这个学生的时间范围内。在资助期结束时，第二轮将完成，学生将负责制作所有B0-&GT；D0K*0分析的完整套件和完整的数据集，包括牛津小组最初提出和首创的独立于模型的GGSZ分析。她还将执行所有统计推断工作，以得出伽马值。这有望通过Run II测量到4度以内。B0在追求伽马的过程中衰减的新奇方面是，干扰允许访问相位信息的两个过程都被抑制到类似的水平。这意味着相对幅度相对较大，CP破坏效应(电荷不对称)可能更显著。这个模式确实受到了部分重建的较重B介子衰变的反馈背景的影响，但通过与有类似兴趣的华威小组的同事合作，我们相信这个背景已经被很好地理解了。除了分析工作外，学生还将在驻欧洲核子研究中心期间参与运行LHCb的顶点探测器和/或前向簇射计数器。该学生还将进行与未来LHCB升级相关的模拟研究。尽管这些工作将对合作非常有价值，并将有助于形成未来向STFC提出的任何关于重口味物理的建议，但只有在与核心伽马分析建立强有力的主题联系的情况下，它才会被包括在论文中。

This student will focus of the LHCb group's flagship measurement of the Unitarity Triangle, gamma. For the first 18-20 months, she will develop the analysis of B0->D0K*0 in the suppressed, and gamma-sensitive, "ADS" modes of the D meson, Kpi, Kpipipi and possibly Kpipi0, all of which have been developed by previous D.Phil students in the context of similar B->D0h decays. The Kpi mode has been searched for in the LHCb Run I dataset but the other two final states have not been attempted. Good signals are expected from the combination of Run I and Run II data, easily within the timescale of this studentship. By the end of the funding period, Run II will be complete and the student will be responsible for producing the complete suite of all B0->D0K*0analyses with the full dataset, including the model-independent GGSZ analysis, originally proposed and pioneered by the Oxford group. She will also perform all the statistical inference work to conclude on a value for gamma. This is expected to be measured to within 4 deg with Run II. The novel aspect of B0 decays in the pursuit of gamma is that the two processes that interfere to allow access to the phase information are both suppressed to a similar level. This means the relative amplitude is comparatively large and the CP-violating effects (charge asymmetries) are potentially more significant. This mode does suffer from feed-down background from partially reconstructed decays of the heavier Bs meson, but through a partnership with colleagues in the Warwick group who have similar interests, we believe this background is well understood. In addition to the analysis work, the student will participate in the running of the vertex detector and/or the forward shower counters of LHCb whilst stationed at CERN. Simulation studies relating to a future LHCb upgrade are also expected from this student. Though such work will be hugely valuable to the collaboration and will help shape any future proposal to STFC for heavy-flavour physics, it will be included in the thesis only if strong thematic links are made with the core gamma analysis.