# Can we probe intrinsic CP/T violation and non-unitarity at long baseline accelerator experiments?

## TL;DR

This paper investigates how new physics scenarios like non-standard interactions and sterile neutrinos affect the measurement of CP violation and unitarity in long baseline neutrino experiments, highlighting challenges in disentangling intrinsic and extrinsic effects.

## Contribution

It analyzes the impact of non-standard interactions and sterile neutrinos on CP violation measurement and unitarity, advancing understanding of new physics effects in neutrino oscillations.

## Key findings

- New physics scenarios complicate the separation of intrinsic and extrinsic CP violation.
- Presence of sterile neutrinos impacts unitarity tests in oscillation experiments.
- Non-standard interactions alter the interpretation of CP violation measurements.

## Abstract

One of the fundamental parameters entering neutrino oscillation framework is the leptonic CP phase $\delta_{13}$ and its measurement is an important goal of the planned long baseline experiments. It should be noted that ordinary matter effects complicate the determination of this parameter and there are studies in literature that deal with separation of intrinsic versus extrinsic CP violation. It is important to investigate the consequences of new physics effects that can not only hamper the measurement of $\delta_{13}$, but also impact the consequences of discrete symmetries such as CP, T and unitarity in different oscillation channels. In the present work, we explore these discrete symmetries and implications on unitarity in presence of two new physics scenarios (non-standard interaction in propagation and presence of sterile neutrinos) that serve as good examples of going beyond the standard scenario in different directions. We uncover the impact of new physics scenarios on disentangling intrinsic and extrinsic CP violation.