2014/06/30 by Clifford Cheung, Michele Papucci, David Sanford +2 · 1 citation
Chemistry · Physics and Astronomy · #Annihilation #Astrophysics #Center (category theory) #Chemistry #Crystallography #Dark Matter and Cosmic Phenomena #Dark matter #Fermi Gamma-ray Space Telescope #Galactic Center #Higgs boson #Higgsino #Large Hadron Collider #Meson #Minimal Supersymmetric Standard Model #Nuclear physics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Standard Model (mathematical formulation) #Stars #astro-ph.CO #hep-ph
paper · pdf · doi:10.1103/physrevd.90.075011
published as Phys. Rev. D 90, 075011 (2014) · 43 pages, 6 figures, references updates to correspond to published version
arxiv created 2014/10/07 · openalex publication_date 2014/10/15 · arxiv updated 2014/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We explore models for the GeV Galactic Center excess (GCE) observed by the Fermi Telescope, focusing on \ensuremathχ\ensuremathχ\ensuremath→ff annihilation processes in the Z3 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 \ensuremathχ\ensuremathχ\ensuremath→ff, while simultaneously thermally producing the observed relic abundance. We apply the results of our simplified model to the Z3 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 tan\ensuremathβ and positive values of \ensuremathμ 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 tan\ensuremathβ, direct detection constraints are easily satisfied by choosing \ensuremathμ 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.