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We investigate the collider signatures of the three benchmark points in thesinglet fermionic dark matter model. The benchmark points, which wereintroduced previously to explain the Fermi gamma-ray excess by dark matter (DM)pair annihilation at the Galactic center, have definite predictions for futurecollider experiments such as the International Linear Collider and theHigh-Luminosity LHC. We consider four collider observables: (1) Higgs signalstrength (essentially $hZZ$ coupling), (2) triple Higgs coupling, (3) exoticHiggs decay, and (4) direct production of a new scalar particle. The benchmarkpoints are classified by the final states of the DM annihilation process: apair of $b$ quarks, SM-like Higgs bosons, and new scalar particles. Eachbenchmark scenario has detectable new physics signals for the above colliderobservables that can be well tested in the future lepton and hadron colliders.

Collider probes of singlet fermionic dark matter scenarios for the Fermi gamma-ray excess