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# The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022)

30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

## Estimation of Detector Systematic Uncertainties at the T2K Far Detector

Not scheduled
5m
Virtual Seoul

#### Virtual Seoul

Poster Neutrino oscillation

### Description

Tokai to Kamioka (T2K) is a long baseline oscillation experiment that measures the neutrino oscillation parameters by observing $\nu_\mu$ ($\bar\nu_\mu$) disappearance and $\nu_e$ ($\bar\nu_e$) appearance from a nearly pure $\nu_\mu$ ($\bar\nu_\mu$) beam. The experiment has two near detectors 280 m from the beam production target, and one far detector located 295 km from the target. The far detector, Super-Kamiokande (SK), is a 50,000 ton water Cherenkov detector. At the energies where the T2K flux peaks (∼ 0.6 GeV), the dominant interactions are charged current quasi–elastic (CCQE), which result in single ring events. There is an ongoing effort to add multi-ring topologies such as charged current resonant pion production (CC1$\pi^+$) to the T2K analysis. This addition is expected to improve the precision of $\sin^2\theta_{23}$ and $\Delta m^2_{32}$ measurements. The estimation of systematic uncertainty is important for sensitivity to the neutrino oscillation parameters. One source of uncertainty is the shortcomings of the detector model, and how this impacts the event selection. The far detector systematic uncertainty is estimated via a fit to atmospheric neutrinos events observed in SK. The process of estimating the detector systematic uncertainty, including the multi-ring $\nu_\mu$CC1$\pi^+$ sample, will be presented in this
poster.

Collaboration T2K

### Primary author

Michael Reh (University of Colorado Boulder)