Leading Loop Effects in Pseudoscalar-Higgs Portal Dark Matter

Abstract

We examine a model with a fermionic dark matter candidate having pseudoscalar interaction with the standard model particles where its direct detection elastic scattering cross section at tree level is highly suppressed. We then calculate analytically the leading loop contribution to the spin independent scattering cross section. It turns out that these loop effects are sizable over a large region of the parameter space. Taking constraints from direct detection experiments, the invisible Higgs decay measurements, observed DM relic density, we find viable regions which are within reach in the future direct detection experiments such as XENONnT.

arXiv commentmatches published version

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• Direct detections of Majorana dark matter in vector portal
• Precision predictions for dark matter with DM@NLO in the MSSM
• Direct detection of dark matter: Precision predictions in a simplified model framework
• Dark Matter Search at Colliders and Neutrino Floor
• Annihilation of singlet fermionic dark matter into two photons via pseudo-scalar mediator