# ICHEP 2022

Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

## Selection of multi-ring charged current $\nu_\mu$CC1$\pi^+$ samples and estimation of detector systematic uncertainties at T2K far detector

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

#### Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Neutrino Physics

### Speaker

Lakshmi Sandhya Mohan (National Centre for Nuclear Research (NCBJ), Poland)

### Description

Tokai to Kamioka (T2K) is an accelerator long baseline experiment that measures the neutrino oscillation parameters by observing $\nu_\mu$ ($\bar{\nu}_\mu$) disappearance and $\nu_e$ ($\bar{\nu}_e$) appearance from a $\nu_\mu$($\bar{\nu}_\mu$) beam. The experiment has both near and far detectors situated at 280 m and 295 km respectively from the beam production target. The far detector Super-Kamiokande (SK) where $\nu$ and $\bar{\nu}$ interact is a water Cherenkov detector. The dominant interactions at $\sim0.6$ GeV where T2K flux peaks are charged current quasi--elastic (CCQE) which result in single ring events. The next largest CC interaction at T2K energy is resonant 1$\pi$ production where the events will have multi--ring topology. The addition of CC $\nu_\mu1\pi^+$ samples to the T2K analysis is expected to improve the precision on $\sin^2\theta_{23}$ and $|\Delta{m^2}_{32}|$. Studies on the selection of CC $1\pi^+$ like events accumulated in forward horn current (FHC) operation are performed for $\nu_\mu$ samples. The estimation of systematic uncertainty is important in the studies of sensitivity to neutrino oscillation parameters. One source of uncertainty is the impact of shortcomings in the detector model on the event selection. In our study, far detector systematic uncertainty is estimated via a fit to atmospheric neutrinos events collected in SK, using a Marko Chain Monte Carlo Framework. We present the selection of $\nu_\mu$CC1$\pi^+$ multi--ring samples and the process of estimation of detector systematic uncertainty,including these samples.

In-person participation Yes

### Primary authors

Dr Cristóvão Fernandes Vilela (CERN) Lakshmi Sandhya Mohan (National Centre for Nuclear Research (NCBJ), Poland) Mr Michael Reh (University of Colorado Boulder)