Abstract
We perform a global fit within the inert doublet model taking into account experimental observables from colliders, direct and indirect dark matter searches and theoretical constraints. In particular, we consider recent results from searches for dark matter annihilation-induced gamma-rays in dwarf spheroidal galaxies and relax the assumption that the inert doublet model should account for the entire dark matter in the Universe. We, moreover, study in how far the model is compatible with a possible dark matter explanation of the so-called Galactic center excess. We find two distinct parameter space regions that are consistent with existing constraints and can simultaneously explain the excess: One with dark matter masses near the Higgs resonance and one around 72 GeV where dark matter annihilates predominantly into pairs of virtual electroweak gauge bosons via the four-vertex arising from the inert doublet’s kinetic term. We briefly discuss future prospects to probe these scenarios.
Highlights
We fit a set of well-established observables: The DM relic density measured by Planck [36], direct detection constraints set by LUX [37], indirect detection constraints from the observation of dwarf spheroidal galaxies set by Fermi-LAT [38,39] as well as the Higgs mass measured at the LHC [40], constraints from invisible Higgs decays [41], constraints from electroweak precision tests [42] and theoretical bounds from unitarity, perturbativity and vacuum stability
We update on the status of the IDM by performing a global fit including all constraints and observables described in Sect. 3 except the Galactic center excess” (GCE) spectrum and the two unconfirmed dwarfs described in Sect. 3.1.4 (Tucana III and IV)
We examined whether the IDM can accommodate the excessive Galactic bulge emission that has been reported by numerous groups in the Fermi-LAT data (“Galactic center excess”)
Summary
The IDM is a special case of a two-Higgs doublet model in which an exact Z2 discrete symmetry is imposed on the Lagrangian, under which all standard model fields (including the usual Higgs doublet H ) are taken to be even, whereas the second scalar doublet is taken to be odd. Where, following common conventions, we have defined λL,S = 2 (λ3 + λ4 ± λ5) These parameters correspond to the coupling of a pair of H 0, A0 states, respectively, to the Higgs boson. The discrete symmetry imposed on the Lagrangian renders the lightest component of the inert doublet stable. If, this lightest Z2-odd particle is neutral (m H0/A0 < m H± ), it can play the role of a DM candidate. A more detailed description of the IDM phenomenology will be presented
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