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T: Fachverband Teilchenphysik

T 45: Neutrino Physics III

T 45.8: Talk

Wednesday, March 18, 2026, 18:00–18:15, AudiMax

Data-driven pile-up systematic estimation for neutrons in T2k ND280Upgrade detector — •Gioele Reina — JGU Mainz

The T2K experiment is a long baseline neutrino experiment, located in Japan. It studies neutrino oscillations by detecting accelerator neutrinos with a complex of near detectors and a far detector. ND280, one of the near detectors, provides a reduction of the neutrino flux and cross section uncertainties and performs cross section measurement. The new features of the upgraded ND280 detector allow to improve reduction these capabilities. In particular, the newly installed target, the Super Fine-Grained Detector, which consists of small plastic scintillator cubes read out by three WLS fibers in the three orthogonal directions, offers high granularity and 3D reconstruction. This new detector design unlocks the sensitivity to neutrons produced in charge-current interactions by measuring their time of flight in the detector.

In order to develop a selection of neutron events it is crucial to estimate the relevant systematic uncertainties. An important systematic uncertainty is related to the background contribution of the pile-up, which consists of simultaneous interactions that mimic the presence of a neutron in the signal sample. By creating a hybrid sample composed of signal events and enhanced background estimated in data, it is possible to evaluate the pile-up contribution using a data-driven approach. Here, this approach is described, along with the effects of this systematic on the signal sample selection.

Keywords: T2K; Neutrino; Accelerator; Systematics; Event selection