The LHC upper bounds for $pp\to \text{diboson}$, $t\bar{t}$ cross section on fermionic dark matter

Abstract

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.

14 pages, text modified by adding a computation on pp into dibosons and tt, published version

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