Abstract
Theories where a fermionic dark matter candidate interacts with the Standard Model through a vector mediator are often studied using minimal models, which are not necessarily anomaly-free. In fact, minimal anomaly-free simplified models are usually strongly constrained by either direct detection experiments or collider searches for dilepton resonances. In this paper, we study the phenomenology of models with a fermionic dark matter candidate that couples axially to a leptophobic vector mediator. Canceling anomalies in these models requires considerably enlarging their field content. For an example minimal scenario we show that the additional fields lead to a potentially much richer phenomenology than the one predicted by the original simplified model. In particular collider searches for pair-produced neutralinos and charginos can be more sensitive than traditional monojet searches in thermally motivated parts of the parameter space where the mediator is outside the reach of current searches.
Highlights
Dark matter phenomenology has often been studied using so-called Simplified Models [1,2,3,4,5,6,7,8] which aim to consider only the minimal Lagrangian and particle content relevant for relic density calculations, direct and indirect detection, and collider searches
Simplified dark matter models where a fermion annihilates into Standard Model (SM) particles via a vector mediator are popular benchmark scenarios
In order to avoid very strong direct detection and dilepton resonance constraints in these models it is convenient to keep the coupling of the vector boson to the DM candidate axial and make it leptophobic
Summary
Dark matter phenomenology has often been studied using so-called Simplified Models [1,2,3,4,5,6,7,8] which aim to consider only the minimal Lagrangian and particle content relevant for relic density calculations, direct and indirect detection, and collider searches. While generating a mass for Z only requires introducing a new Higgs field, cancelling the anomalies associated with the dark fermion can prove cumbersome Since these models typically introduce family-independent couplings for the leptons and quarks, they often correspond to U(1)B and U(1)L models of gauged baryon and lepton numbers, which were originally discussed in [43,44,45] with the dark matter phenomenology studied in [46,47,48]. In order to avoid the current direct detection and collider constraints, we require that the mediator is strictly leptophobic, with a purely axial coupling to at least one fermionic interaction eigenstate We use this scenario as a benchmark example to illustrate that, in the region of parameter space outside the reach of the dijet searches, anomaly-free gauge portal models will often be more sensitive to searches for new heavy states with electroweak charges at the LHC than to monojet searches.
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