Speaker
Description
Precise measurements of neutrino oscillations in long-baseline experiments depend on an accurate understanding of neutrino beam properties and neutrino–nucleus interactions—two dominant sources of systematic uncertainty. To reduce these uncertainties, the ND280 near detector of the T2K neutrino experiment in Japan has undergone a major upgrade designed to provide full polar angle acceptance, lower proton tracking thresholds, and enhanced timing precision.
A key component of this upgrade is the Time-of-Flight (TOF) detector, which consists of six scintillator planes surrounding the inner upgrade components. Installed at J-PARC between 2023 and 2024, the TOF has been operational and collecting data since installation. This poster presents the TOF commissioning results, performance characterisation, and first physics results using beam and cosmic-ray data.
The TOF achieves a timing resolution of ~180 ps, enabling robust particle identification and effective rejection of out-of-fiducial-volume events. Ongoing calibration efforts and detector performance studies aim to further improve timing resolution and detection efficiency. The results demonstrate the TOF’s capabilities and underscore its role in achieving the physics goals of the upgraded T2K ND280 detector.
