Abstract
In this work we present a simple extension of the Standard Model that contains, as the only new physics component, a massive spin-one matter field in the adjoint representation of $SU(2)_{L}$. In order to be consistent with perturbative unitarity, the vector field must be odd under a $Z_{2}$ symmetry. Radiative corrections make the neutral component of the triplet ($V^{0}$) slightly lighter than the charged ones. We show that $V^{0}$ can be the dark matter particle while satisfying all current bounds if it has a mass between $2.8$ and $3.8$ TeV. We present the current limit on the model parameter space from highly complementary experimental constraints including dark matter relic density measurement, dark matter direct and indirect detection searches, LHC data on Higgs couplings to photons and LHC data on disappearing track searches. We show that the two-dimensional parameter space can be substantially covered by disappearing track searches at a future 100 TeV hadron collider, which will probe DM mass upto about 1.2 TeV.
Highlights
Our current microscopic understanding of nature is based on the Standard Model (SM) of particle physics
We see that the dark matter (DM) thermal relic abundance can always match the Planck result for sufficiently large values of the mass MV, with the lowest value MV ≈ 2.85 TeV attained for a 1⁄4 0
We remark that lower values of the mass are allowed with V0 constituting only a fraction of the DM relic density, down to the mass value where perturbative unitarity loss occurs at a too low scale, as indicated by the dashed portion of the curves, where MV > Λ=10, with Λ given in Eq (5)
Summary
Our current microscopic understanding of nature is based on the Standard Model (SM) of particle physics. In the absence of electroweak symmetry breaking (EWSB) the requirement of perturbative unitarity automatically imposes a Z2 symmetry on this new vector field, preventing the lightest (neutral) component from decaying This Z2 symmetry is a requirement for the consistency of the model rather than introduced as a means to stabilize the DM candidate. The initial motivation for this work, originating from a previous study [20] performed by one of the authors, was the construction of a theory containing a massive matter vector field coupled to a Yang-Mills field (with neither scalars nor symmetry breaking) The resulting theory was shown to be Becchi-Rouet-Stora-Tyutin invariant In some sense, this construction defines a new kind of particle: a vector boson which does not act as the carrier of an interaction but plays the role of dark matter.
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