Abstract
We examine a real electroweak triplet scalar field as dark matter, abandoning the requirement that its relic abundance is determined through freeze out in a standard cosmological history (a situation which we refer to as `miracle-less WIMP’). We extract the bounds on such a particle from collider searches, searches for direct scattering with terrestrial targets, and searches for the indirect products of annihilation. Each type of search provides complementary information, and each is most effective in a different region of parameter space. LHC searches tend to be highly dependent on the mass of the SU(2) charged partner state, and are effective for very large or very tiny mass splitting between it and the neutral dark matter component. Direct searches are very effective at bounding the Higgs portal coupling, but ineffective once it falls below \lambda_{\text{eff}} \lesssim 10^{-3}λeff≲10−3. Indirect searches suffer from large astrophysical uncertainties due to the backgrounds and JJ-factors, but do provide key information for \sim∼ 100 GeV to TeV masses. Synthesizing the allowed parameter space, this example of WIMP dark matter remains viable, but only in miracle-less regimes.
Highlights
The nature of dark matter has persisted as one of the most vital open questions necessary for our understanding the universe’s fundamental building blocks
Searches for dark matter annihilation in the present day universe provide a complimentary probe of dark matter parameter space, with typical targets including the galactic center (GC) and dwarf spheroidal galaxies
This is due in part to the strategy that H.E.S.S. uses to determine its background rate, by comparing a slightly off-center control region (OFF) to the signal (ON) region centered on the Galactic center
Summary
The nature of dark matter has persisted as one of the most vital open questions necessary for our understanding the universe’s fundamental building blocks. Many theories of physics beyond the standard model (BSM) predict new fields with roughly electroweak-sized interactions and masses, some of which have the correct properties to be the dark matter. These candidates, called weakly interacting massive particles (WIMPs), are among the most compelling and well-studied, largely because the freeze out mechanism naturally suggests a relic abundance similar to the one inferred from cosmological measurements [1, 2]. We will find it convenient to refer to the strength of the effective h-φ0-φ0 interaction as λeff v/2, where: λeff As discussed below, these couplings induce invisible Higgs decays and there are loose constraints on the value of Λ, which can accommodate mass splittings of up to a few hundred GeV
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