Excluding the light dark matter window of a 331 model using LHC and direct dark matter detection data

Abstract

We sift the impact of the recent Higgs precise measurements, and recent dark matter direct detection results, on the dark sector of an electroweak extension of the Standard Model that has a complex scalar as dark matter. We find that in this model the Higgs decays with a large branching ratio into dark matter particles, and charged scalars when these are kinematically available, for any coupling strength differently from the so called Higgs portal. Moreover, we compute the abundance and spin-independent WIMP-nucleon scattering cross section, which are driven by the Higgs and Z boson processes. We decisively exclude the 1 − 500 GeV dark matter window and find the most stringent lower bound in the literature on the scale of symmetry breaking of the model namely 10 TeV, after applying the LUX-2013 limit. Interestingly, the projected XENON1T constraint will be able to rule out the entire 1 GeV-1000 GeV dark matter mass range. Lastly, for completeness, we compute the charged scalar production cross section at the LHC and comment on the possibility of detection at current and future LHC runnings.

A variant of 3-3-1 model for the generation of the SM fermion mass and mixing pattern

“…(vi) These models contain a natural Peccei-Quinn symmetry, which solves the strong-CP problem [111][112][113][114]. (vii) The 3-3-1 models with heavy sterile neutrinos include cold dark matter candidates as weakly interacting massive particles (WIMPs) [115][116][117][118]. A concise review of WIMPs in 3-3-1 Electroweak Gauge Models is provided in ref.…”

A Brief Review on WIMPs in 331 Electroweak Gauge Models

“…TeV, which contrasted with recent LUX results on direct detection (Akerib et al, 2014), implies a lower bound to φ mass, 500 m φ > ɶ GeV (Cogollo et al, 2014), as can be seen in Fig. 3.…”

“…This explanation fits well in the context of 331LHN model, since the lightest heavy neutral fermion, N 1 , can play the role of the mother particle, decaying into φ plus an active neutrino with parameters appropriate to produce only a fraction of relativistic WIMPs, remarking that this fraction must not exceed 0:01% of the whole number of WIMPs so as to not jeopardize structure formation (Hooper et al, 2012). This approach was followed in (Kelso et al, 2014) and has been shown to be feasible for the 331LHN model while keeping consistency with the above mentioned constraints on GeV (Cogollo et al, 2014).…”

“…The analysis was rather crude, since several of the parameters of the model were fixed instead of using a scan (This drawback was to be fixed only later in a study of the 331LHN model (Cogollo et al, 2014). Also, the relic abundance was computed by using the approximate analytic Boltzmann equation (Jungman et al, 1996;Kolb and Turner, 1990).…”

A Simple Model of Gauged Lepton and Baryon Charges

“…The leptoquarks possessing B = -1 as we put are in order to cancel the baryonic anomalies. Note that in the framework of the 3-3-1 models, the family number achieved has a different origin, which is a consequence of the new weak-isospin symmetry SU(3) L with a corresponding enlargement of the lepton and quark representations (see, for recent works, Kelso et al, 2014;Cogollo et al, 2014;Dong et al, 2014;2012). It is noteworthy that the [SU(2)] 2 U(1) Y anomaly was removed because of Y(F L ) = 0 and this is why we assumed q j = -q k = 1/2.…”