# Monochromatic dark neutrinos and boosted dark matter in noble liquid direct detection

## TL;DR

This paper explores how future large-scale liquid xenon and argon detectors could detect signals from dark matter annihilations into neutrinos or boosted dark matter, surpassing current neutrino detectors in sensitivity.

## Contribution

It demonstrates the potential of next-generation noble liquid detectors to probe dark matter interactions and annihilation products, expanding the scope of direct detection beyond traditional WIMP searches.

## Key findings

- Future detectors like DARWIN and ARGO can surpass Super-Kamiokande in constraining dark neutrino flux.
- Current experiments restrict boosted dark matter baryonic couplings to 10-100 times the weak interaction.
- Detection could imply cored dark matter density profiles in galactic centers.

## Abstract

If dark matter self-annihilates into neutrinos or a second component of ("boosted") dark matter that is nucleophilic, the annihilation products may be detected with high rates via coherent nuclear scattering. A future multi-ten-tonne liquid xenon detector such as DARWIN, and a multi-hundred-tonne liquid argon detector, ARGO, would be sensitive to the flux of these particles in complementary ranges of $10-1000$ MeV dark matter masses. We derive these sensitivities after accounting for atmospheric and diffuse supernova neutrino backgrounds, and realistic nuclear recoil acceptances. We find that their constraints on the dark neutrino flux may surpass neutrino detectors such as Super-Kamiokande, and that they would extensively probe parametric regions that explain the missing satellites problem in neutrino portal models. The XENON1T and Borexino experiments currently restrict the effective baryonic coupling of thermal boosted dark matter to $\lesssim 10-100 \ \times$ the weak interaction, but DARWIN and ARGO would probe down to couplings 10 times smaller. Detection of boosted dark matter with baryonic couplings $\sim 10^{-3}-10^{-2} \ \times$ the weak coupling could indicate that the dark matter density profile in the centers of galactic halos become cored, rather than cuspy, through annihilations. This work demonstrates that, alongside liquid xenon, liquid argon direct detection technology would emerge a major player in dark matter searches within and beyond the WIMP paradigm.