The LHC upper bounds for $pp \to \text{diboson}$, $t\bar t$ cross   section on fermionic dark matter
  The ATLAS report in August 2016 provided an upper limit for the $pp\to$ diboson and $t\bar t$ cross sections. We consider a pseudoscalar-mediated fermionic dark matter together with gluon and photon effective operators interacting with the pseudoscalar. Choosing the resonance mass being $m_\rho=200, 750$ GeV and $2$ TeV, beside the relic density and the invisible Higgs decay constraints we constrain more the space of parameters with the diboson and $t\bar t$ cross section upper bounds. We finally provide some benchmarks consistent with all the constraints. Having exploited a pseudoscalar mediator, the DM-nucleon cross section is velocity suppressed so that the model evades easily the bounds put by the future direct detection experiments such as XENON1T. 
Karim Ghorbani (Arak U.) and Parsa Hossein Ghorbani (IPM, Tehran)
hep-ph