# Probing non-standard neutrino interactions with supernova neutrinos

## TL;DR

This paper explores how non-standard neutrino interactions could be detected through supernova neutrino signals, revealing potential resonant conversions and spectral features in future large-scale detectors.

## Contribution

It provides a detailed analysis of NSI effects on supernova neutrino propagation, highlighting new resonant conversion phenomena and detection strategies in large water Cherenkov detectors.

## Key findings

- NSI can cause dramatic spectral features in supernova neutrinos.
- Detectable effects occur for NSI strengths of a few percent.
- Resonant conversions are significant for small flavor-changing NSI above 2×10^{-5}.

## Abstract

We analyze the possibility of probing non-standard neutrino interactions (NSI, for short) through the detection of neutrinos produced in a future galactic supernova (SN).We consider the effect of NSI on the neutrino propagation through the SN envelope within a three-neutrino framework, paying special attention to the inclusion of NSI-induced resonant conversions, which may take place in the most deleptonised inner layers. We study the possibility of detecting NSI effects in a Megaton water Cherenkov detector, either through modulation effects in the $\bar\nu_e$ spectrum due to (i) the passage of shock waves through the SN envelope, (ii) the time dependence of the electron fraction and (iii) the Earth matter effects; or, finally, through the possible detectability of the neutronization $\nu_e$ burst. We find that the $\bar\nu_e$ spectrum can exhibit dramatic features due to the internal NSI-induced resonant conversion. This occurs for non-universal NSI strengths of a few %, and for very small flavor-changing NSI above a few$\times 10^{-5}$.