Constraints on Ultra Heavy Dark Matter Properties from Dwarf Spheroidal Galaxies with LHAASO Observations

TL;DR

This study uses LHAASO data to search for gamma-ray signals from ultra-heavy dark matter in dwarf spheroidal galaxies, setting new constraints on dark matter properties in the TeV to EeV range.

Contribution

First to analyze LHAASO data for ultra-heavy dark matter signals from dwarf galaxies, providing the most stringent constraints on annihilation cross-section and decay lifetime.

Findings

No significant dark matter signals detected.

Established the most stringent constraints on annihilation cross-section up to EeV.

Derived limits on dark matter decay lifetime.

Abstract

In this work we try to search for signals generated by ultra-heavy dark matter at the Large High Altitude Air Shower Observatory (LHAASO) data. We look for possible gamma-ray by dark matter annihilation or decay from 16 dwarf spheroidal galaxies in the field of view of LHAASO. Dwarf spheroidal galaxies are among the most promising targets for indirect detection of dark matter which have low fluxes of astrophysical $\gamma$-ray background while large amount of dark matter. By analyzing more than 700 days observational data at LHAASO, no significant dark matter signal from 1 TeV to 1 EeV is detected. Accordingly we derive the most stringent constraints on the ultra-heavy dark matter annihilation cross-section up to EeV. The constraints on the lifetime of dark matter in decay mode are also derived.