Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Neutrino physics 8

T 58.5: Talk

Wednesday, March 6, 2024, 17:00–17:15, Geb. 30.22: Gaede-HS

Timing properties study in T2K ND280 Upgrade detector — •Gioele Reina for the T2K collaboration — Johannes Gutenberg-Universität Mainz

Detailed models of neutrino interactions with nuclei play a crucial role in long-baseline neutrino oscillation experiments. These models depend on neutron final state interactions (FSI) and, since neutrons are not easily detected and the cross section of these processes is not well-known, they constitute a relevant source of systematic uncertainties. The capabilities of the upgraded T2K ND280 near detector provide an opportunity to improve our knowledge on neutron FSI.

The newly installed Super Fine-Grained Detector (SFGD) consists of small plastic scintillator cubes read out by three wavelength shifting fibers in the three orthogonal directions. It ensures high granularity and 3D reconstruction, which can play a key role in improving the detection of low energy neutrons in neutrino interactions.

Before using real data, efficiency studies of neutron detection need to be performed with simulated events and control samples within the T2K software framework, where neutron reconstruction and selection have been developed. Evaluating how these may vary according to the actual detector performance is important since they will have an impact on the determination of systematic uncertainties in the experiment analysis and can be a source of systematic uncertainties themselves. Simulation-based determination of SFGD detector timing response will be presented along with the impact on efficiency studies for neutron detection.

Keywords: T2K; Neutrino; Accelerators; Software; Simulation