Search for Neutrino Charge-Parity (CP) Violation from a Global 3-Flavour Analysis of Neutrino and Antineutrino Data from Long-Baseline Accelerator-Bas

从长基线加速器中的中微子和反中微子数据的全局三味分析中寻找中微子电荷宇称 (CP) 违规

• 批准号: 2275621
• 金额: --
• 依托单位: University of Liverpool
• 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-2275621
• 关键词: Search; Neutrino; Charge; Parity; CP

Why the universe is made up primarily by matter, and not by equal parts of matter and antimatter, is one most intriguing questions in modern science. One of the conditions required for the observed Baryon Asymmetry of the Universe (BAU) is the violation of Charge-Parity (CP) symmetry. There are very few sources of CP violation in the Standard Model (SM) of Particle Physics: i) The CP-violating phase in the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix, ii) the Quantum Chromodynamics (QCD) vacuum angle, and iii) the CP-violating phase in the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) neutrino mixing matrix. The first two are known to be too weak to explain the observed BAU, so a measurement of the latter is of tremendous interest!Evidence for neutrino CP violation has been produced both by the T2K and NOvA accelerator-based long-baseline neutrino experiments. The main goal of this thesis is to produce the final T2K CP violation result using the full T2K statistics and, in addition, to contribute towards a joint analysis of T2K and NOvA data.

为什么宇宙主要由物质组成，而不是由等量的物质和反物质组成，这是现代科学中最有趣的问题之一。观测到的宇宙重子不对称性（BAU）所需的条件之一是电荷宇称（CP）对称性的破坏。在粒子物理学的标准模型（SM）中，CP破坏的来源很少：i）Cabibbo-Kobayashi-Maskawa（CKM）夸克混合矩阵中的CP破坏相，ii）量子色动力学（QCD）真空角，iii）Pontecorvo-Maki-Nakagawa-Sakata（PMNS）中微子混合矩阵中的CP破坏相。前两个已知是太弱，无法解释所观察到的BAU，所以后者的测量是巨大的兴趣！中微子CP破坏的证据已经由T2 K和NOvA加速器为基础的长基线中微子实验产生。本论文的主要目标是使用完整的T2 K统计数据产生最终的T2 K CP违规结果，此外，还有助于对T2 K和NOvA数据的联合分析。