# A Direct Detection View of the Neutrino NSI Landscape

## TL;DR

This paper investigates how direct detection experiments, especially xenon-based detectors, can explore non-standard neutrino interactions by analyzing solar neutrino scattering, offering a new approach complementary to existing methods.

## Contribution

It introduces a novel NSI parametrisation that includes electron contributions and visualises experimental complementarity, applying it to recent and future xenon detector data.

## Key findings

- First limits on NSI from XENONnT and LUX-ZEPLIN data
- Projections show future experiments can significantly constrain NSI
- New software package SNuDD developed for analysis

## Abstract

In this article, we study the potential of direct detection experiments to explore the parameter space of general non-standard neutrino interactions (NSI) via solar neutrino scattering. Due to their sensitivity to neutrino-electron and neutrino-nucleus scattering, direct detection provides a complementary view of the NSI landscape to that of spallation sources and neutrino oscillation experiments. In particular, the large admixture of tau neutrinos in the solar flux makes direct detection experiments well-suited to probe the full flavour space of NSI. To study this, we develop a re-parametrisation of the NSI framework that explicitly includes a variable electron contribution and allows for a clear visualisation of the complementarity of the different experimental sources. Using this new parametrisation, we explore how previous bounds from spallation source and neutrino oscillation experiments are impacted. For the first time, we compute limits on NSI from the first results of the XENONnT and LUX-ZEPLIN experiments, and we obtain projections for future xenon-based experiments. These computations have been performed with our newly developed software package, SNuDD. Our results demonstrate the importance of using a more general NSI parametrisation and indicate that next generation direct detection experiments will become powerful probes of neutrino NSI.