Speaker
Description
Dark Matter (DM) particles in the Milky Way’s halo could self-annihilate or decay, producing Standard Model (SM) particles such as gamma rays. These processes may generate detectable excesses in the gamma-ray energy spectra observed at Earth. We search for such signatures using a sample of data collected by the Fermi Large Area Telescope in the energy range from 1 GeV to 1 TeV energy range in its first 15 years of operation. We employ a maximum likelihood fitting method with sliding energy windows to identify possible line-like spectral features. Our analysis targets five optimized regions of interest (RoIs), selected to enhance sensitivity to different theoretical DM distributions within the Milky Way’s halo, and incorporates a combined likelihood approach. Systematic uncertainties are constrained by using the Galactic Plane as a control region. Additionally, we explore possible box-shaped features that could arise if DM interactions in the halo involve long-lived mediators decaying into gamma-ray final states. Across both scenarios we find no statistically significant excesses. Consequently, we derive new and more stringent upper limits on the DM velocity-averaged annihilation cross section, surpassing previous constraints in the literature.
Details
Francesco Loparco
Università di Bari and INFN Sezione di Bari
| Internet talk | No |
|---|---|
| Is this an abstract from experimental collaboration? | Yes |
| Name of experiment and experimental site | Fermi LAT |
| Is the speaker for that presentation defined? | Yes |
