NMSSM interpretation of the Galactic Center excess

作者：Cheung Clifford^*; Papucci Michele; Sanford David; Shah Nausheen R; Zurek Kathryn M

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, 90(7): 075011.

DOI：10.1103/PhysRevD.90.075011

We explore models for the GeV Galactic Center excess (GCE) observed by the Fermi Telescope, focusing on chi chi -> f (f) over bar annihilation processes in the Z(3) 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 chi chi -> f (f) over bar, while simultaneously thermally producing the observed relic abundance. We apply the results of our simplified model to the Z(3) 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 beta and positive values of mu 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 beta, direct detection constraints are easily satisfied by choosing mu 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.

• 出版日期2014-10-15