Abstract
We consider simplified models for dark matter (DM) at the LHC, focused on mono-Higgs, -Z or -b produced in the final state. Our primary purpose is to study the LHC reach of a relatively complete set of simplified models for these final states, while comparing the reach of the mono-X DM search against direct searches for the mediating particle. We find that direct searches for the mediating particle, whether in di-jets, jets+, multi-b+, or di-boson+, are usually stronger. We draw attention to the cases that the mono-X search is strongest, which include regions of parameter space in inelastic DM, two Higgs doublet, and squark mediated production models with a compressed spectrum.
Highlights
Effective operators within the EFT framework are generated by integrating out heavy mediators at a scale Λ in the UV-complete theory; a lower limit on Λ can be derived selfconsistently if the energy scale of the processes used to constrain the theory is smaller than Λ
We consider simplified models for dark matter (DM) at the LHC, focused on mono-Higgs, -Z or -b produced in the final state
We find that direct searches for the mediating particle, whether in di-jets, jets+E/ T, multib+E/ T, or di-boson+E/ T, are usually stronger
Summary
Before describing the details of each simplified model, we discuss the general properties and assumptions made on the models considered here. The model have the smallest number of mediating particles for each mono-X topology we consider. Inelastic Squarks searches compared mono-h mono-z mono-h mono-z mono-z mono-jet multi-jet + E/ T mono-z mono-b multi-b jets + E/ T mono-h mono-jet mono-h mono-jet multi-jet + E/ T mono-h mono-z diboson + E/ T bosons + jets + E/ T method full recasting full recasting full recasting full recasting full recasting results of [24] results of [24] full recasting simplified model [64] simplified model [65] results of [41] full recasting results of [41] full recasting full recasting full recasting full recasting simplified model [66, 67] simplified model [68] Given this set of rules, one can find the list of all the possible topologies and embed each of them in the minimal incarnation of a simplified model as defined above. We relax the requirement of singlet DM only for the case of the inelastic squark model, where the topology we consider requires the DM to take on SM quantum numbers. It is observed that the bounds on the production cross-section for large mediator mass is vastly improved at increased center of mass energy
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