Constraining annihilating dark matter by radio continuum spectrum of the Large Magellanic Cloud

TL;DR

This study uses radio continuum data from the Large Magellanic Cloud to search for dark matter annihilation signals, finding a slight positive indication and setting constraints on dark matter properties.

Contribution

It provides the first analysis of dark matter annihilation signals using radio data from the LMC, including a potential detection and new mass constraints.

Findings

Slight positive dark matter signal at 1.5σ significance

Best-fit dark matter mass around 90 GeV for bbar channel

Constraints on dark matter mass for various annihilation channels

Abstract

Recent radio observations have obtained stringent constraints for annihilating dark matter. In this article, we use the radio continuum spectral data of the Large Magellanic Cloud (LMC) to analyze the dark matter annihilation signals. We have discovered a slightly positive signal of dark matter annihilation with a $1.5\sigma$ statistical significance. The overall best-fit dark matter mass is $m_{\rm DM} \approx 90$ GeV, annihilating via $b\bar{b}$ channel. We have also constrained the $3\sigma$ lower limits of dark matter mass with the standard thermal dark matter annihilation cross section for the $e^+e^-$, $\mu^+\mu^-$, $\tau^+\tau^-$ and $b\bar{b}$ channels.