Dark matter in the Higgs triplet model

Abstract

The inability to predict neutrino masses and the existence of the dark matter are two essential shortcomings of the Standard Model. The Higgs Triplet Model provides an elegant resolution of neutrino masses via the seesaw mechanism. We show here that introducing vectorlike leptons in the model also provides a resolution to the problem of dark matter. We investigate constraints, including the invisible decay width of the Higgs boson and the electroweak precision variables, and impose restrictions on model parameters. We analyze the effect of the relic density constraint on the mass and Yukawa coupling of dark matter. We also calculate the cross sections for indirect and direct dark matter detection and show our model predictions for the neutrino and muon fluxes from the Sun, and the restrictions they impose on the parameter space. With the addition of vectorlike leptons, the model is completely consistent with dark matter constraints, in addition to improving electroweak precision and doubly charged mass restrictions, which are rendered consistent with present experimental data.

Building and testing models with extended Higgs sectors

“…If the lightest component of the multiplet is neutral, it is automatically a DM candidate because no renormalizable interaction can connect the new multiplet with the SM fields and induce its decay. More sophisticated models include triplets [417,418,419] or a triplet and a singlet [420,397], and large scalar multiplet DM models [406]. They have been invoked not only to introduce DM but also to explain small neutrino masses or some astrophysical observations, such as the 130 GeV γ line which several groups seemed to observe in the Fermi-LAT data.…”

The supersymmetric Georgi-Machacek model

“…This is true largely independently of the triplet VEV assuming the loop induced coupling to diphotons is dominated by the W boson, as often the case in the absence of large couplings in the scalar potential. One could in principle cancel the W boson loop contribution with charged scalar loops to reduce the diphoton branching ratio and evade these constraints or, as done for a number of Higgs triplet models [83][84][85] including the GM model [86], add additional particles which contain a sufficiently light DM candidate, thus opening up an invisible decay channel.…”

Dark Matter and Collider Searches in $$S_3$$-Symmetric 2HDM with Vector Like Lepton

“…VLLs can acquire masses from the gauge-invariant bilinear dimension-3 bare mass terms. Since they do not achieve masses from the Yukawa couplings alone, unlike fourth generation of chiral fermions, the vector like fermions are weakly constrained from electroweak precision observables and Higgs data [35]. Although the vector like quarks participate in both the production and decay of Higgs boson, only the decay of Higgs boson is modified in presence of vector like leptons (VLLs).…”

“…SM extended with one or more generations of VLLs have been studied earlier in [37][38][39]. The extensions of Higgs singlet [40], Higgs doublet [41][42][43][44], Higgs triplet [35,45,46], left right symmetric model [47][48][49] along with VLLs have been very popular in literature for dark matter (DM) and collider searches throughout.…”