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

We investigate the collidersignatures of the three benchmarkpoints in the singlet fermionic dark matter model. The benchmarkpoints, which were introduced previously to explain the Fermi gamma-ray excess by dark matter (DM) pair annihilationat the Galactic center, have definite predictions for future colliderexperiments such as the International Linear Colliderand the High-Luminosity LHC. We consider four colliderobservables: (1) Higgs signal strength (essentially $hZZ$ coupling), (2) triple Higgs coupling, (3) exotic Higgs decay, and (4) direct productionof a new scalar particle. The benchmarkpoints are classified by the final states of the DM annihilationprocess: a pair of $b$ quarks, SM-like Higgs bosons, and new scalar particles. Each benchmarkscenario has detectable new physics signals for the above colliderobservables that can be well testedin the future lepton and hadron colliders.