# Correlations and degeneracies among the NSI parameters with tunable beams at DUNE

## TL;DR

This paper investigates how different beam configurations at DUNE can improve the measurement of nonstandard neutrino interaction parameters and their correlations with CP violation, enhancing the experiment's sensitivity to new physics.

## Contribution

It analyzes the impact of combining various beam tunes at DUNE on constraining NSI parameters and their correlations with the CP-violating phase, providing new insights into degeneracies.

## Key findings

- Combining beam tunes improves sensitivity to NSI parameters.
- Different beam configurations alter the allowed parameter regions.
- Study highlights the importance of beam tuning in probing new physics.

## Abstract

The Deep Underground Neutrino Experiment (DUNE) is a leading experiment in neutrino physics which is presently under construction. DUNE aims to measure the yet unknown parameters in the three flavour oscillation scenario which includes discovery of leptonic CP violation, determination of the mass hierarchy and determination of the octant of $\theta_{23}$. Additionally, the ancillary goals of DUNE include probing the sub-dominant effects induced by new physics. A widely studied new physics scenario is that of nonstandard neutrino interactions (NSI) in propagation which impacts the oscillations of neutrinos. We consider some of the essential NSI parameters impacting the oscillation signals at DUNE and explore the space of NSI parameters as well as study their correlations among themselves and with the yet unknown CP violating phase, $\delta$ appearing in the standard paradigm. The experiment utilizes a wide band beam and provides us with a unique opportunity to utilize different beam tunes at DUNE. We demonstrate that combining information from different beam tunes (low energy, LE and medium energy, ME) available at DUNE impacts the ability to probe some of these parameters and leads to altering the allowed regions in two-dimensional space of parameters considered.