Measurement of CP violation with B0->Dpi+pi- decays

使用 B0->Dpi pi- 衰减测量 CP 违规

• 批准号: 2108739
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2108739
• 关键词: Measurement; CP; violation; B0; Dpi+pi

The decay channel B0->Dpi+pi-, where the neutral D meson is reconstructed in the CP eigenstate final states K+K- and pi+pi-, can be used to make a theoretically clean determination of the angle beta of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. Doing so requires detailed understanding of the Dalitz plot distribution of B0->D0barpi+pi- decays, for which the D0bar->K+pi- decay is the most appropriate. In this project, a novel simultaneous decay-time-dependent analysis of the modes with all neutral D meson decays is implemented. This approach allows control of the Dalitz plot modelling as well as experimental effects such as decay-time acceptance and flavour tagging calibration. The analysis will be implemented using the data sample collected with the LHCb experiment during Runs 1 and 2 of the Large Hadron Collider, and is expected to lead to the most precise determination of the angle beta in theoretically clean channels.

通过衰变通道B 0->Dpi+pi-，中性D介子在CP本征态末态K+K-和pi+pi-中的重构，可以从理论上清晰地确定Cabibbo-Kobayashi-Maskawa夸克混合矩阵的β角。这样做需要详细了解B 0-> D 0 barpi +pi-衰变的Dalitz图分布，其中D 0 bar->K+pi-衰变是最合适的。在这个项目中，一个新的同时衰变时间依赖的分析模式与所有中性D介子衰变的实现。这种方法允许控制的Dalitz图建模以及实验效果，如衰减时间的接受和风味标记校准。该分析将使用大型强子对撞机1991年和1992年期间LHCb实验收集的数据样本进行，预计将在理论上干净的通道中最精确地确定β角。