Looking through the Pseudo-Scalar Portal into Dark Matter: Novel Mono-Higgs and Mono-$Z$ Signatures at LHC

TL;DR

This paper explores novel mono-Higgs and mono-Z signatures at the LHC as indicators of pseudo-scalar portal interactions between dark matter and the Standard Model, using a Two-Higgs-Doublet-Model framework.

Contribution

It introduces a renormalizable pseudo-scalar portal model with resonant mono-Higgs and mono-Z signatures as new dark matter detection channels at colliders.

Findings

Resonant mono-Higgs and mono-Z signatures are promising dark matter signals.

The model provides a distinctive collider signature not previously emphasized.

Resonant signatures enhance the detectability of dark matter at the LHC.

Abstract

Mono-$X$ signatures are a powerful collider probe of the nature of dark matter. We show that mono-Higgs and mono-$Z$ may be key signatures of pseudo-scalar portal interactions between dark matter and the SM. We demonstrate this using a simple renormalizable version of the portal, with a Two-Higgs-Doublet-Model as electroweak symmetry breaking sector. Mono-$Z$ and mono-Higgs signatures in this scenario are of resonant type, which constitutes a novel type of dark matter signature at LHC.