Abstract
Abstract We study a class of simplified dark matter models in which one dark matter particle couples with a mediator and a Standard Model fermion. In such models, collider and direct detection searches probe complimentary regions of parameter space. For Majorana dark matter, direct detection covers the region near mediator-dark matter degeneracy, while colliders probe regions with a large dark matter and mediator mass splitting. For Dirac and complex dark matter, direct detection is effective for the entire region above the mass threshold, but colliders provide a strong bound for dark matter lighter than a few GeV. We also point out that dedicated searches for signatures with two jets or a monojet not coming from initial state radiation, along missing transverse energy can cover the remaining parameter space for thermal relic dark matter.
Highlights
JHEP11(2013)171 detection experiments, but are still much below the center-of-mass energy, 8 TeV, of the latest run at the LHC
We study a class of simplified dark matter models in which one dark matter particle couples with a mediator and a Standard Model fermion
We study simplified dark matter models with SM fermions as the portal particle, which we call Fermion Portal (FP) dark matter
Summary
If the dark matter sector interacts directly with a single fermion in the SM, two particles with different spins are required in the dark matter sector. Restricting to particles with a spin less than one, there are two general situations: fermionic dark matter with a color-triplet scalar partner or scalar dark matter with a color-triplet fermion partner. In the former case, we consider both Dirac and Majorana dark matter, while for the latter case we only consider a complex scalar dark matter and skip the real scalar dark matter case [6], which has a quark mass suppressed s-wave or a dwave or three-body suppressed annihilation rate and a velocity suppressed direct detection cross section if the quark masses are neglected. Some other studies for the spin-dependent direct detection and indirect detection signatures can be found in refs. [46, 47]
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