# Hunting On- and Off-Axis for Light Dark Matter with DUNE-PRISM

## TL;DR

This paper investigates how the DUNE-PRISM detector's ability to move off-axis enhances the detection sensitivity for sub-GeV scalar dark matter interacting via a dark photon, surpassing traditional on-axis methods.

## Contribution

It introduces a novel approach using the DUNE-PRISM detector's mobility to improve sensitivity to light dark matter compared to fixed-position measurements.

## Key findings

- Off-axis measurements significantly increase dark matter detection sensitivity.
- DUNE-PRISM can probe parameter space inaccessible to other experiments.
- Sensitivity improvements are demonstrated through simulation studies.

## Abstract

We explore the sensitivity of the Deep Underground Neutrino Experiment (DUNE) near detector and the proposed DUNE-PRISM movable near detector to sub-GeV dark matter, specifically scalar dark matter coupled to the Standard Model via a sub-GeV dark photon. We consider dark matter produced in the DUNE target that travels to the detector and scatters off electrons. By combining searches for dark matter at many off-axis positions with DUNE-PRISM, sensitivity to this scenario can be much stronger than when performing a measurement at one on-axis position.