Status of the inert doublet model and the role of multileptons at the LHC

Abstract

A possible feature of the Inert Doublet Model (IDM) is to provide a dark matter candidate together with an alteration of both direct and indirect collider constraints that allow for a heavy Higgs boson. We study the IDM in light of recent results from Higgs searches at the Large Hadron Collider (LHC) in combination with dark matter direct-detection limits from the XENON experiment. We ask under what conditions the IDM can still accommodate a heavy Higgs boson. We find that IDM scenarios with a Higgs boson in the mass range 160 to 600 GeV are ruled out only when all experimental constraints are combined. For models explaining only a fraction of the DM the limits are weakened, and IDMs with a heavy Higgs are allowed. We discuss the prospects for future detection of such IDM scenarios in the four-lepton plus missing energy channel at the LHC. This signal can show up in the first year of running at √ s = 14 TeV, and we present detector-level studies for a few benchmark models.

Dark matter in the inert doublet model after the discovery of a Higgs-like boson at the LHC

“…As a consequence, in order for the IDM to still provide DM-compliant scenarios in this mass range, one has to rely on resonances and thresholds to achieve the correct relic density without violating the null XENON results, which would happen for sufficiently large coupling values. In particular, we will see that the only points of the interesting intermediate mass regime that survive the constraint are lying close to the Higgs "funnel" region and the W W * production threshold (see also [12,23] for recent works on the subject), i.e. the region where LOP annihilation is dominated by nearly on-shell h 0 exchange or gauge boson pair-production.…”

“…1 Additionally, the IDM was advocated to allow for a heavier SM-like Higgs boson compatible with electroweak precision tests, m h 0 200 GeV, without resorting to unnatural fine-tuning [3] (for recent work also considering this possibility, see, e.g., ref. [12]). The new states predicted by the IDM have been subjected to collider bounds [13], and they provide an interesting phenomenology for the Large Hadron Collider (LHC) [3,[14][15][16][17][18].…”

Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

“…[94][95][96][97][98]. While for the high mass region, although hard to be test at LHC, most parameter space of this region is in the reach of CTA experiment [99,100].…”

“…For inert doublet DM η 0 R /η 0 I , multi-lepton plus E T signatures at LHC have been extensively studied in ref. [94][95][96][97][98], thus we concentrate on F or φ DM. For fermion singlet DM, the promising signature is 25) which leads to + − + E T signature at LHC.…”

The Inert Doublet Model and its Phenomenology

“…For the trilepton channel, a couple of benchmark models showed 3σ detection potential at a luminosity of 100 fb −1 [54], but all those had a SM Higgs boson lighter than 150 GeV. The complementary, almost background-free, multilepton signal with ≥ 4 leptons seem difficult to discover at early stages of the LHC runs [55]. Note that most of the LHC studied IDM benchmark models, except those with substantial coannihilation or WW annihilation at freeze-out, are now in conflict with the recent, e.g.…”