# NuFact 2022: The 23rd International Workshop on Neutrinos from Accelerators

July 30, 2022 to August 6, 2022
Cliff Lodge
US/Mountain timezone

## Latest results on T2K Near Detector constraints for neutrino oscillation measurements

Aug 4, 2022, 11:56 AM
18m
Ballroom 2&3

### Ballroom 2&3

Talk WG1: Neutrino Oscillation Physics

### Speaker

Callum Wilkinson (Lawrence Berkeley National Laboratory)

### Description

T2K is a long baseline neutrino experiment which exploits a neutrino and antineutrino beam at JPARC to perform precision measurements of atmospheric parameters $\Delta m^{2}_{32}$, $\sin^2(\theta_{23})$ and to provide 3$\sigma$ exclusion for some intervals of the CP-violating phase $\delta_{CP}$.

The latest results of the measurement of oscillation parameters will be presented, the main systematic uncertainties limiting the precision will be described, as well as the role of the near detector to constrain such systematic uncertainties. In particular, the latest analysis exploits a new nuclear model to describe neutrino-nucleus interactions, a new flux tuning based on an improved NA61/SHINE hadro-production measurement and new samples with proton and photon tagging at the near detector. All these novelties, designed to extract more robust constrains on the mentioned systematics uncertainties, will be described, together with the results of such improved analysis at the near detector. The future strategy to improve further the precision will be presented: the T2K beam will be upgraded with increased power and an upgrade of the ND280 near detector, located 2.5 degrees off-axis, is being assembled to exploit the increased statistics.

Attendance type In-person presentation