# Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

## TL;DR

This paper investigates how large-scale anisotropy in high-energy cosmic rays can be used to detect or constrain heavy decaying dark matter particles, comparing anisotropy constraints with gamma-ray limits.

## Contribution

It provides new constraints on dark matter particle lifetime using cosmic ray anisotropy data and discusses the measurement precision needed for future detection.

## Key findings

- Anisotropy constraints are weaker than gamma-ray limits.
- Estimated precision needed for anisotropy measurements.
- Discussed prospects for dark matter detection with current facilities.

## Abstract

We examine the role of the large--scale anisotropy of the high--energy cosmic ray distribution in a search for the heavy decaying dark matter (DM) signal. Using recent anisotropy measurements from the extensive air shower (EAS) observatories we constrain the lifetime of the DM particles with masses $10^{7}~\leq~M_X~\leq~10^{16}$ GeV. These constraints appear to be weaker than that obtained with the high energy gamma-ray limits. We also estimate the desired precision level for the anisotropy measurements to discern the decaying DM signal marginally allowed by the gamma-ray limits and discuss the prospects of the DM search with the modern EAS facilities.