Speaker
Description
The T2K long-baseline neutrino oscillation experiment is designed to probe CP violation in the neutrino sector and to perform precise measurements of neutrino oscillation parameters. The T2K neutrino beam, produced at J-PARC, is detected by the near detector ND280, located 280 meters downstream from the proton target. The recent upgrade of the ND280 was accomplished to reduce systematic uncertainties and to improve measurements of the neutrino beam as the oscillations become more significant. A core element of the upgrade is the Super Fine-Grained Detector (SuperFGD) that consists of 2 million scintillator cubes. Signals from each cube are read out by three orthogonal wavelength-shifting (WLS) fibers and detected by micropixel photodetectors (MPPCs).
SuperFGD provides enhanced detection capabilities, allowing it to efficiently select high-angle and low-momentum particles, accumulate a larger sample of neutrino interactions, and detect neutrons. The detector has a high light yield for charged particles, high time resolution, and a low detection threshold.
SuperFGD was installed in the ND280 pit at J-PARC in October 2023 and began full data taking in June 2024. The detection of muon neutrinos in SuperFGD via charged current in the T2K neutrino beam and reconstruction of stopped protons, long particle tracks, and multi-track events in SuperFGD will be presented. Key parameters such as time resolution and attenuation length will be discussed in detail.
Supported by the RSF grant # 24-12-00271
