Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection

Figure 4

The contours of (in fb) and regions (darker to lighter shades) of (red), (blue), (pink), (gray), (orange), and (light green). Parameters not varied along the axes are fixed at ,  GeV,  GeV,  GeV, , and . These parameter choices are motivated by obtaining the observed dark matter relic density and direct detection constraints.