Abstract
The inert 2-Higgs Doublet Model (i2HDM) is a well-motivated minimal consistent Dark Matter (DM) model, but it is rather challenging to test at the Large Hadron Collider (LHC) in the parameter space allowed by relic density and DM direct detection constraints. This is especially true when considering the latest XENON 1T data on direct DM searches which we use here to present the best current combined limit on the i2HDM parameter space. In this analysis, we present prospects to advance the exploitation of DM mono-jet signatures from the i2HDM at the LHC, by emphasising that a shape analysis of the missing transverse momentum distribution allows one to sizably improve the LHC discovery potential. As a key element of our analysis, we explore the validity of using an effective vertex, $ggH$, for the coupling of the Higgs boson to gluons using a full one-loop computation. We have found sizeable differences between the two approaches, especially in the high missing transverse momentum region, and incorporated the respective K-factors to obtain the correct kinematical distributions. As a result, we delineate a realistic search strategy and present the improved current and projected LHC sensitivity to the i2HDM parameter space.
Highlights
Despite several independent evidences of dark matter (DM) at the cosmological scale, its nature remains unknown since no experiment so far has been able to claim its detection in the laboratory and probe its Published by the American Physical Society
III, we present the main results of the paper, which include the analysis of the validity of the effective ggH (H being the Standard Model (SM)-like Higgs) vertex approach, the exploration of several model benchmarks, and finding the LHC potential to probe the i2HDM at present and projected luminosities via exploitation of the EmT iss shape in the monojet signature
We have assessed the scope of the LHC in accessing a monojet signal stemming from the i2HDM wherein the lightest inert Higgs state h1 is a DM candidate, produced in pairs from gluon-gluon fusion into the SM-like Higgs H and accompanied by a hard jet with transverse momentum above 100 GeV, i.e., a h1h1j final state
Summary
Despite several independent evidences of dark matter (DM) at the cosmological scale, its nature remains unknown since no experiment so far has been able to claim its detection in the laboratory and probe its. New findings of this study include a) updating limits on the i2HDM parameter space following the recent XENON 1T results on DM direct detection (DD) searches; b) exploring the range of validity of the effective ggH vertex in the heavy top mass limit by considering the EmT iss distribution and comparing its shape to the full one-loop result, which will allow us to determine a realistic LHC potential for probing DM in different kinematical regions; c) optimizing and improving the LHC sensitivity to the DM monojet signal from the i2HDM defined by Higgs and Z-boson mediation processes using a shape analysis of the EmT iss distribution; d) projecting our results to the High Luminosity LHC (HL-LHC) phase.
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