# Why T2K should run in dominant neutrino mode to discover CP violation ?

## TL;DR

This paper argues that T2K should prioritize running in dominant neutrino mode to optimize the chances of discovering CP violation in the leptonic sector, based on current hints and experimental considerations.

## Contribution

It analyzes the optimal neutrino-antineutrino running ratio for T2K to maximize the likelihood of detecting leptonic CP violation.

## Key findings

- Dominant neutrino mode enhances CP violation discovery potential.
- Current data suggests a strategic shift in T2K's running mode could improve results.
- Optimal running ratio depends on the true value of the CP phase.

## Abstract

The first hint of the leptonic CP phase $\delta_{CP}=-90^\circ$ has already came from the long-baseline neutrino oscillation experiment T2K. This hint is derived from the neutrino data of T2K and currently it is running in the antineutrino mode. In this work we ask the question what should be the proportion of neutrino and antineutrino running of the T2K experiment to discover CP violation in the leptonic sector.