Abstract
We explore models for the GeV Galactic Center excess (GCE) observed by the Fermi Telescope, focusing on annihilation processes in the next-to-minimal supersymmetric standard model (NMSSM). We begin by examining the requirements for a simplified model [parametrized by the couplings and masses of dark matter (DM) and mediator particles] to reproduce the GCE via , while simultaneously thermally producing the observed relic abundance. We apply the results of our simplified model to the NMSSM for singlino/Higgsino (S/H) or bino/Higgsino (B/H) DM. In the case of S/H DM, we find that the DM must be very close to a pseudoscalar resonance to be viable, and large and positive values of are preferred for evading direct detection constraints while simultaneously obtaining the observed Higgs mass. In the case of B/H DM, by contrast, the situation is much less tuned: annihilation generally occurs off resonance, and for large , direct detection constraints are easily satisfied by choosing sufficiently large and negative. The B/H model generally has a light, largely MSSM-like pseudoscalar with no accompanying charged Higgs, which could be searched for at the LHC.
- Received 4 August 2014
DOI:https://doi.org/10.1103/PhysRevD.90.075011
© 2014 American Physical Society