Canadian Participation in the T2K Long Baseline Neutrino Experiment

这个提议支持了加拿大参与T2K长基线实验的高度成功，在这个实验中，一个强烈的μ子（反）中微子束在J-PARC加速器实验室产生，并被引导到295公里外的超级神冈探测器，研究它们向中微子振荡产生的其他中微子的转变。加拿大成员是这项工作的创始成员，为实验设计引入了基本要素，并提供了关键部件，如光学跃迁辐射探测器、细粒度探测器和时间投影室，这些部件构成了近地探测器跟踪系统的核心。在TRIUMF和ComputeCanada的支持下，加拿大提供了其他关键的贡献，如网络、慢速控制和近探测器工作的数据库、大规模计算和数据访问、超级神冈的新重建框架，以及波束线的维修和维护。T2K在中微子研究方面已经建立了强大的科学成就记录，包括发现介子中微子与电子中微子的外观，最精确的中微子混合角测量，以及现在最灵敏的中微子与反中微子振荡不对称性探测，这可能为宇宙为何是物质主导提供线索。这些科学问题是当今粒子物理学面临的最紧迫的问题之一。

This proposal supports the highly successful Canadian involvement in the T2K long baseline experiment, where an intense muon (anti)neutrino beam is produced at the J-PARC accelerator laboratory and directed 295 km away to the Super-Kamiokande detector to study their transition to other neutrino flavours arising from neutrino oscillations. Canadian members were founding members of the effort, introducing fundamental elements to the design of the experiment, and contributing key components such as the optical transition radiation detector, the fine-grained detectors and time projection chambers that form the core of the tracking system for the near detectors. With support from TRIUMF and ComputeCanada, Canadians provide other critical contributions such as the network, slow control, and databases for the near detector effort, large scale computing and data access, a new reconstruction framework for Super-Kamiokande, and beam line repair and maintenance. T2K has established strong track record of scientific achievements in the study of neutrinos including the discovery of the muon neutrino to electron neutrino appearance, the most precise measurements of the neutrino mixing angle theta23, and now the most sensitive probes of asymmetries in the neutrino vs. antineutrino oscillations which may provide clues on why the universe is matter-dominated. These scientific issues are among the most urgent facing particle physics today.