Challenges posed by non-standard neutrino interactions in the determination of $\delta_{CP}$ at DUNE

TL;DR

This paper investigates how non-standard neutrino interactions (NSIs) can complicate the measurement of CP violation at DUNE, highlighting specific degeneracies that affect sensitivity and precision.

Contribution

It analyzes the impact of various NSI parameter degeneracies on DUNE's ability to detect and measure leptonic CP violation, especially focusing on the hierarchy degeneracy caused by _{ee}=-1.

Findings

NSIs can introduce degeneracies affecting CP sensitivity.

The hierarchy degeneracy at _{ee}=-1 significantly impacts CP measurement.

Certain NSI parameters can mimic or obscure CP violation signals.

Abstract

One of the primary objectives of Deep Underground Neutrino Experiment (DUNE) is to discover the leptonic CP violation and to identify it's source. In this context, we study the impact of non-standard neutrino interactions (NSIs) on observing the CP violation signal at DUNE. We explore the impact of various parameter degeneracies introduced by non-zero NSI and identify which of these can influence the CP violation sensitivity and CP precision of DUNE, by considering NSI both in data and in theory. In particular, we study how the CP sensitivity of DUNE is affected because of the intrinsic hierarchy degeneracy which occurs when the diagonal NSI parameter $\epsilon_{ee}=-1$ and $\delta_{CP}= \pm 90^{\circ}$.