Abstract
Despite the fact that dark matter constitutes one of the cornerstones of the standard cosmological paradigm, its existence has so far only been inferred from astronomical observations, and its microscopic nature remains elusive. Theoretical arguments suggest that dark matter might be connected to the symmetry-breaking mechanism of the electroweak interactions or of other symmetries extending the Standard Model of particle physics. The resulting Higgs bosons, including the 125 GeV spin-0 particle discovered recently at the Large Hadron Collider, therefore represent a unique tool to search for dark matter candidates at collider experiments. This article reviews some of the relevant theoretical models as well as the results from the searches for dark matter in signatures that involve a Higgs-like particle at the Large Hadron Collider.
Highlights
The concept of dark matter (DM) was originally introduced to reconcile the observations of the high velocity dispersion of galactic clusters [1] and the flat rotational curves of spiral galaxies [2] with the predictions of Newton’s gravity
Collider searches for DM on the other hand rely on the production of DM particles in high-energy particle collisions and can be separated in two broad classes according to the experimental signature that they produce: (i) searches for missing transverse momentum (ETmiss) plus X signatures, known as mono-X, where the ETmiss resulting from the DM particles leaves the detectors unnoticed and the visible, i.e., detectable, final state X is used for triggering, and (ii) searches containing only visible particles such as pairs of leptons or jets that aim to detect the particles mediating the interactions between the DM and the Standard Model (SM) particles through the observation of a new resonance or a modification of the kinematics of the final-state particles
In order to highlight the complementarity of collider and noncollider bounds on Higgs portal models in a simple fashion, we focus in what follows on the subclass of models in which the leading effects are well captured by the effective field theory (EFT) Lagrangian LφH
Summary
The concept of dark matter (DM) was originally introduced to reconcile the observations of the high velocity dispersion of galactic clusters [1] and the flat rotational curves of spiral galaxies [2] with the predictions of Newton’s gravity. While the scalar sectors of this models are quite different, both the 2HDM+Z and the 2MDM models contain a spin-1 mediator that couples the DM particles to some of the SM states This feature allows one to the test the models by searching for Symmetry 2021, 13, 2406 resonant production of non-ETmiss final states such as dijets, ttand Zh. Using the latest available LHC data, we derive the constraints on the 2HDM+Z and the 2MDM model that arise from the relevant searches for resonant SM final states and the mono-jet signature. Using the latest available LHC data, we derive the constraints on the 2HDM+Z and the 2MDM model that arise from the relevant searches for resonant SM final states and the mono-jet signature In both cases, we show that for the benchmark scenarios considered by ATLAS and CMS, non-ETmiss searches exclude additional parameter space not probed by the existing mono-Higgs interpretations. The signatures are ordered as they appear in the text
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