# Powerful Solar Signatures of Long-Lived Dark Mediators

## TL;DR

This paper explores how long-lived dark mediators affect solar signals, enhancing gamma-ray and neutrino detection prospects for dark matter, and significantly improving sensitivity over current methods.

## Contribution

It introduces the impact of long-lived dark mediators on solar gamma-ray and neutrino signals, proposing new detection strategies and sensitivity improvements.

## Key findings

- Gamma-ray measurements with Fermi, HAWC, and LHAASO can detect signals from dark mediators.
- Enhanced neutrino fluxes at TeV energies improve dark matter detection with IceCube and KM3NeT.
- Potential to improve sensitivity to dark matter spin-dependent cross sections by orders of magnitude.

## Abstract

Dark matter capture and annihilation in the Sun can produce detectable high-energy neutrinos, providing a probe of the dark matter-proton scattering cross section. We consider the case when annihilation proceeds via long-lived dark mediators, which allows gamma rays to escape the Sun and reduces the attenuation of neutrinos. For gamma rays, there are exciting new opportunities, due to detailed measurements of GeV solar gamma rays with Fermi, and unprecedented sensitivities in the TeV range with HAWC and LHAASO. For neutrinos, the enhanced flux, particularly at higher energies ($\sim$TeV), allows a more sensitive dark matter search with IceCube and KM3NeT. We show that these search channels can be extremely powerful, potentially improving sensitivity to the dark matter spin-dependent scattering cross section by several orders of magnitude relative to present searches for high-energy solar neutrinos, as well as direct detection experiments.