22-29 July 2015
Europe/Vienna timezone

A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model

Jul 24, 2015, 12:30 PM
15m
HS33

HS33

talk Astroparticle Physics, Cosmology, Gravitation Astroparticle Physics, Cosmology, Gravitation

Speaker

Sascha Caron (Nikhef National institute for subatomic physics (NL))

Description

Observations with the Fermi Large Area Telescope (LAT) indicate an excess in gamma rays originating from the center of our Galaxy. A possible explanation for this excess is the annihilation of Dark Matter particles. We have investigated the annihilation of neutralinos as Dark Matter candidates within the phenomenological Minimal Supersymmetric Standard Model (pMSSM). An iterative particle filter approach was used to search for solutions within the pMSSM. We found solutions that are consistent with astroparticle physics and collider experiments, and provide a fit to the energy spectrum of the excess. The neutralino is a Bino/Higgsino or Bino/Wino/Higgsino mixture with a mass in the range 84−92~GeV or 87−97~GeV annihilating into W bosons. A third solutions is found for a neutralino of mass 174−187~GeV annihilating into top quarks. The best solutions yield a Dark Matter relic density 0.06<Ωh2<0.13. These pMSSM solutions make clear forecasts for LHC, direct and indirect DM detection experiments. If the MSSM explanation of the excess seen by Fermi-LAT is correct, a DM signal might be discovered soon.

additional information

based on arXiv:1502.05703 (submitted to JCAP) and upcoming work

Primary author

Sascha Caron (Nikhef National institute for subatomic physics (NL))

Co-authors

Abraham Achterberg (RU Nijmegen) Christoph Weniger (University of Amsterdam) Luc Hendriks (RU Nijmegen) Roberto Ruiz De Austri (IFIC) Simone Amoroso (Albert-Ludwigs-Universitaet Freiburg (DE))

Presentation materials