Canadian Participation in the T2K Long Baseline Neutrino Experiment

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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.