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

衰变通道B0-&gt；dpi+pi-，其中中性D介子在CP本征态终态K+K-和pi+pi-中重建，可以用来在理论上干净地确定Cabibbo-Kobayashi-Maskawa夸克混合矩阵的角β。要做到这一点，需要详细了解B0-&gt；D0barpi+pi-衰变的Dalitz图分布，其中D0bar-&gt；K+pi-衰变是最合适的。在这个项目中，我们对所有中性D介子衰变的模式进行了一种新的同时衰减时间相关分析。这种方法允许控制Dalitz曲线图建模以及实验效果，如衰变时间接受和风味标签校准。这项分析将使用大型强子对撞机第一次和第二次运行期间LHCb实验收集的数据样本进行，预计将导致在理论上干净的通道中最精确地确定β角。

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.