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

TL;DR

This paper investigates fermionic dark matter models mediated by a pseudoscalar, constrained by LHC diboson and top pair production limits, relic density, and Higgs decay, providing benchmark points compatible with all constraints.

Contribution

It introduces a pseudoscalar-mediated fermionic dark matter model and constrains its parameter space using LHC bounds and cosmological data, offering viable benchmark scenarios.

Findings

Model evades future direct detection bounds due to velocity suppression.

Parameter space constrained by LHC diboson and top pair cross section limits.

Benchmark points consistent with all experimental and cosmological constraints.

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.