Neutrino oscillation at T2K and Hyper Kamiokande and development of the Hyper Kamiokande light injection calibration system

中微子振荡是粒子物理标准模型，特别是超越标准模型的物理中的重要现象，但仍有许多问题没有得到解答。破坏CP的阶段仍然难以捉摸，中微子质量等级的确切性质仍然未知。因此，作为中微子物理学的领军人物，Hyper Kamiokande(Hyper-K)实验有望揭开中微子振荡和CP破坏的奥秘。这项研究源于中微子科学对精确度和创新的日益增长的需求，因此Hyper-K旨在通过利用实验技术的进步来扩大我们对这些现象的理解，并提供一个深入研究中微子振荡的独特机会。这个雄心勃勃的项目建立在T2K实验成功的基础上，将在塑造中微子物理的未来方面发挥关键作用。这个项目加强了我们对中微子振荡的理解，特别是利用T2K实验和Hyper-K数据寻找CP破坏。虽然T2K已经取得了显著的进展，但需要更多的数据、升级的ND280探测器和更大的光束功率才能达到最终的灵敏度。主要目的是开发和建造Hyper-K光注入校准系统的部件并分析其数据。通过这样做，我们打算填补我们知识的空白，并为这项研究的下一阶段铺平道路。该研究项目提出了一种双重方法，以减少Hyper-K探测器系统学中的系统学和适合T2K实验的振荡。总体目标是通过最大限度地减少探测器系统学和数据分析带来的不确定性，提高实验的精确度和准确度。第一部分旨在通过优化光注入系统来提高Hyper-K探测器的性能，并使用它来确定具有相关不确定度的探测器特性。除了这项硬件工作，还将使用水切伦科夫模拟(WCSim)来模拟探测器对中微子相互作用的响应。模拟的事件将用于研究测量的探测器特性对测量的信号的影响。本研究的第二部分旨在将改进的探测器系统融入到适合T2K和Hyper K实验的振荡中。因此，T2K振荡拟合将随着探测器系统的更新而升级，以提高中微子振荡测量的精度。将进行广泛的模拟和统计分析，以评估这些变化对FIT性能的影响。通过将这两项研究工作结合起来，我们的目标是大幅减少Hyper-K探测器的系统不确定度，并提高T2K实验中中微子振荡测量的精度。总而言之，这个项目弥补了我们对中微子振荡和CP破坏的认识上的差距。Hyper-K光注入系统的开发和建造，加上对增强的T2K数据的分析，将对粒子物理领域做出重大贡献。理解CP破坏可能会对我们理解物质-反物质不对称和宇宙演化产生深远的影响，使这项研究在更广泛的科学背景下具有至关重要的意义。

Neutrino oscillations are crucial phenomena in the Standard model of particle physics or specifically the physics beyond the Standard model, yet many questions remain unanswered. The CP-violating phase remains elusive, and the exact nature of neutrino mass hierarchy is still unknown. Thus, the Hyper Kamiokande (Hyper-K) experiment, a leading endeavour in neutrino physics, is poised to unlock the mysteries of neutrino oscillations and CP violation. This research stems from the ever-increasing need for precision and innovation in neutrino science and so Hyper-K aims to expand our understanding of these phenomena by leveraging advancements in experimental techniques and offers a unique opportunity to delve into neutrino oscillation studies. This ambitious project builds upon the success of the T2K experiment and will be pivotal in shaping the future of neutrino physics. This project enhances our understanding of neutrino oscillations, specifically focusing on the search for CP violation using the T2K experiment and Hyper-K data. While T2K has made remarkable progress, more data, an upgraded ND280 detector, and increased beam power are required to achieve ultimate sensitivity. The primary aim is to develop and construct elements of the Hyper-K light injection calibration system and analyse its data. By doing so, we intend to fill the gaps in our knowledge and pave the way for the next phase of this research. The research project presents a two-fold approach to reduce systematics in the Hyper-K detector systematics and the oscillation fit for the T2K experiment. The overarching goal is to improve the precision and accuracy of the experiments by minimising uncertainties stemming from both the detector systematics and the data analysis. The first part is aimed to enhance the performance of the Hyper-K detector by optimising the light injection system and using it to determine detcor properties with associated uncertainties. Alongside this hardware work, the Water Cherenkov Simulation (WCSim) will be employed to model the detector response to neutrino interactions. The simulated events will be used to study the impact of measured detector properties on the measured signals. The second part of this research aims to incorporate the improved detector systematics into the oscillation fit for the T2K and Hyper K experiments. Therefore, the T2K oscillation fit will be upgraded with the updated detector systematics to improve the precision of the neutrino oscillation measurements. Extensive simulations and statistical analyses will be conducted to assess the impact of these changes on the fit's performance. By combining these two research efforts, we aim to substantially reduce systematic uncertainties in the Hyper-K detector and improve the precision of neutrino oscillation measurements in the T2K experiment. In conclusion, this project bridges the gap in our knowledge of neutrino oscillations and CP violation. The development and construction of the Hyper-K light injection system, coupled with the analysis of enhanced T2K data, will contribute significantly to the field of particle physics. Understanding CP violation could have profound implications for our understanding of matter-antimatter asymmetry and the evolution of the universe, making this research critically significant in the broader context of science.