Abstract
Scenarios for multi-component scalar dark matter based on a single ZN (N ≥ 4) symmetry are simple and well-motivated. In this paper we investigate, for the first time, the phenomenology of the Z5 model for two-component dark matter. This model, which can be seen as an extension of the well-known singlet scalar model, features two complex scalar fields — the dark matter particles — that are Standard Model singlets but have different charges under a Z5 symmetry. The interactions allowed by the Z5 give rise to novel processes between the dark matter particles that affect their relic densities and their detection prospects, which we study in detail. The key parameters of the model are identified and its viable regions are characterized by means of random scans. We show that, unlike the singlet scalar model, dark matter masses below the TeV are still compatible with present data. Even though the dark matter density turns out to be dominated by the lighter component, we find that current and future direct detection experiments may be sensitive to signals from both dark matter particles.
Highlights
We study the two-component dark matter model based on the Z5 symmetry, which serves as a prototype for all the ZN scenarios in which the dark matter particles are two complex scalars
Our results indicate that the entire range of dark matter masses is allowed, that the dark matter density is always dominated by the lighter component, and that both dark matter particles may produce signals in future direct detection experiments
We investigated the phenomenology of the two-component dark matter model based on a Z5 symmetry, which serves as an archetype for other ZN (N > 5) models with two complex scalar dark matter particles
Summary
We study the two-component dark matter model based on the Z5 symmetry, which serves as a prototype for all the ZN scenarios in which the dark matter particles are two complex scalars. We want to characterize the viable parameter space of this model and to determine its detection prospects. The viable parameter space of the model is characterized by means of random scans, which we analyze in detail. We first determine, via random scans, the viable parameter space of the model and use it to predict its detection prospects. The unique charge assignment (up to trivial field redefinitions) that allows both fields to be stable is [12] These new fields — the dark matter particles — are assumed to be singlets of the SM gauge group whereas the SM particles are taken to be singlets under the Z5. To ensure that the model describes a two-component dark matter scenario, we assume that φ1,2 do not acquire a vacuum expectation value and that their masses satisfy
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