Characterization of the mono-s di-Higgs signal in final states with four b-jets and missing transverse momentum

This report presents a study of a signal characterized by di-Higgs production and Missing Trans- verse Momentum (MET) due to dark matter (DM) pair production. This signature is predicted by a dark Higgs model with additional scalar and vector gauge bosons acting as mediators between the dark sector and Standard Model (SM) particles. Truth level event samples at a pp center-of-mass energy of √s = 13 TeV are generated for comparison of two signal grids, where either the DM candidate or the dark Higgs boson is the lightest particle in the dark sector. The differing mass hierarchies lead to clear distinctions in both the kinematic distributions and cross sections, partly due to the new DM annihilation channel in the latter grid. The associated DM relic abundances are calculated and compared with the observed value, as well as with results from previous searches.