Probing the inert doublet model using jet substructure with a multivariate analysis

Abstract

We explore the challenging but phenomenologically interesting hierarchical mass spectrum of the inert doublet model where relatively light dark matter along with much heavier scalar states can fully satisfy the constraints on the relic abundance and also fulfill other theoretical as well as collider and astrophysical bounds. To probe this region of parameter space at the LHC, we propose a signal process that combines up to two large radius boosted jets along with substantial missing transverse momentum. Aided by our intuitive signal selection, we capture a hybrid process where the di-fatjet signal is significantly enhanced by the mono-fatjet contribution with minimal effects on the SM di-fatjet background. Substantiated by the sizable mass difference between the scalars, these boosted jets, originally produced from the hadronic decay of massive vector bosons, still carry the inherent footprint of their root. These features implanted inside the jet substructure can provide additional handles to deal with a large background involving QCD jets. We adopt a multivariate analysis using a boosted decision tree to provide a robust mechanism to explore the hierarchical scenario, which would bring almost the entire available parameter space well within reach of the 14 TeV LHC runs with high luminosity.

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

“…9 Collider signature of Inert doublet DM at LHC Inert doublet has been an attractive DM framework, due to the possibility of collider detection [52,53]. Here, we relook into the possible collider search strategies of IDM at LHC in presence of a second scalar singlet DM component.…”

Confronting dark matter co-annihilation of Inert two Higgs Doublet Model with a compressed mass spectrum

“…Here, we only choose ∆ ± up to 30 GeV but one can freely extend it to a larger value until m H ± ∼ 250 GeV disfavored by the EWPT data (for a detailed analysis, see ref. [77]). On the other hand, without the helps from the charged Higgs co-annihilations, we have checked that the total co-annihilation contribution to the relic density cannot be larger than 85%.…”

Investigating extended scalar sectors at current and future colliders

“…The model has been vastly explored in the literature (see e.g. [20,[31][32][33][34] and references therein, as well as [20,31,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] for studies of LHC phenomenology). Signatures at colliders always render electroweak gauge bosons and missing transverse energy.…”