Abstract
We consider dark sectors with spontaneously broken gauge symmetries, where cascade decays of the dark sector fields naturally produce multi-Higgs boson final states along with dark matter. Our study focuses on two and three Higgs boson final states with missing energy using a multivariate analysis with Boosted Decision Trees. We find that the di-Higgs boson channel is quite promising for the $\bar b b + \gamma \gamma$ and $\bar b b + \bar \ell \ell$ decay modes. The tri-Higgs boson final state with missing energy, on the other hand, appears to be beyond the reach of the LHC in analogous channels. This may change when fully hadronic Higgs boson decays are considered.
Highlights
The scalar sector of the Standard Model (SM) remains relatively little explored compared to the gauge sector
We focus on the heavy CP-even scalar (H) production through gluon fusion, which subsequently decays via the hidden sector vector fields into the 125 GeV Higgs bosons (h) along with two dark matter particles
We have considered dark sectors with spontaneously broken gauge symmetries, where dark cascade decays naturally lead to multi-Higgs boson final states with missing energy
Summary
The scalar sector of the Standard Model (SM) remains relatively little explored compared to the gauge sector. To set the framework for our study, we introduce a simplified model in which cascade decays of heavier states produce dark matter and the Higgs bosons. This model is motivated by non-Abelian gauged hidden sectors in which gauge symmetry is broken completely by vacuum expectation values (VEVs) of a minimal set of dark Higgs boson multiplets [26].
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