Speaker
Description
T2K is a long-baseline experiment that studies neutrino and antineutrino oscillations by measuring muon neutrino disappearance and electron neutrino appearance over a baseline of 295 km. The magnetized ND280 near detector at J-PARC plays a crucial role in constraining systematic uncertainties associated with the neutrino flux and neutrino–nucleus interaction cross sections. ND280 has recently undergone a major upgrade, including the installation of the SuperFGD, a high-granularity detector composed of approximately two million optically-isolated scintillating cube, along with two horizontal Time Projection Chambers and a plastic-scintillator–based Time-of-Flight system. This upgraded configuration significantly extends the phase space for neutrino interactions, enabling isotropic muon reconstruction, a lower proton momentum threshold, and efficient neutron event-by-event kinetic energy reconstruction via Time-of-Flight measurements. In addition, the upgrade improves the purity of the electron neutrino sample. Following the completion of the ND280 upgrade in 2024, new data have been collected. This presentation will report the first results on event reconstruction performance and neutrino interaction selection with the upgraded detector.
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