Speaker
Dr
Thomas Rizzo
(SLAC)
Description
We attempt to build a model that describes the Fermi galactic gamma-ray excess
(FGCE) within a UV-complete Supersymmetric framework; we find this to be highly
non-trivial. At the very least a successful Supersymmetric explanation must have
several important ingredients in order to fit the data and satisfy other theoretical and
experimental constraints. Under the assumption that a single annihilation mediator is
responsible for both the observed relic density as well as the FGCE, we show that the
requirements are not easily satised in many TeV-scale SUSY models, but can be met
with some model building effort in the general NMSSM with 10 parameters beyond
the MSSM. We find that the data selects a particular region of the parameter space
with a mostly singlino lightest Supersymmetric particle and a relatively light CP-odd
Higgs boson that acts as the mediator for dark matter annihilation. We study the
predictions for various observables within this parameter space, and find that searches
for this light CP-odd state at the LHC, as well as searches for the direct detection of
dark matter, are likely to be quite challenging. It is possible that a signature could
be observed in the flavor sector; however, indirect detection remains the best probe of
this scenario.
Primary author
Dr
Thomas Rizzo
(SLAC)
Co-authors
James Gainer
(University of Florida (US))
JoAnne Hewett
(SLAC)
Matthew Cahill-Rowley
(SLAC National Accelerator Laboratory)
