# Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T

## TL;DR

This paper presents the first experimental constraints on spin-dependent WIMP-nucleon interactions from the XENON1T experiment, setting the most stringent limits on WIMP-neutron cross sections to date.

## Contribution

It provides the first experimental results constraining spin-dependent WIMP-nucleon cross sections using the full XENON1T exposure, including the most stringent limits on WIMP-neutron interactions.

## Key findings

- No significant WIMP signal detected.
- Set the most stringent limit on WIMP-neutron cross section to date.
- Excluded new parameter space in axial-vector mediator models.

## Abstract

We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to constrain the spin-dependent proton-only and neutron-only cases. No significant signal excess is observed, and a profile likelihood ratio analysis is used to set exclusion limits on the WIMP-nucleon interactions. This includes the most stringent constraint to date on the WIMP-neutron cross section, with a minimum of $6.3\times10^{-42}$ cm$^2$ at 30 GeV/c${}^2$ and 90% confidence level. The results are compared with those from collider searches and used to exclude new parameter space in an isoscalar theory with an axial-vector mediator.