Article

# Multicomponent Dark Matter in Supersymmetric Hidden Sector Extensions

Physical review D: Particles and fields 04/2010; DOI: 10.1103/PHYSREVD.81.095017

Source: arXiv

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**ABSTRACT:**A new general parameterization with eight mixing parameters among Z, γ and an extra neutral gauge boson Z′ is proposed and subjected to phenomenological analysis. We show that in addition to the conventional Weinberg angle θW, there are seven other phenomenological parameters, G′, ξ, η, θl, θr, r and l, for the most general Z-γ-Z′ mixings, in which parameter G′ arises due to the presence of an extra Stueckelberg-type mass coupling. Combined with the conventional Z-Z′ mass mixing angle θ′, the remaining six parameters, ξ, η, θl-θ′, θr-θ′, r and l, are caused by general kinetic mixing. In all eight phenomenological parameters, θW, G′, ξ, η, θl, θr, r and l, we can determine the Z-Z′ mass mixing angle θ′ and the mass ratio MZ/MZ′. The Z-γ-Z′ mixing that we discuss are based on the model-independent description of the extended electroweak chiral Lagrangian (EWCL) previously proposed by us. In addition, we show that there are eight corresponding independent theoretical coefficients in our EWCL, which are fully fixed by our eight phenomenological mixing parameters. We further find that the experimental measurability of these eight parameters does not rely on the extended neutral current for Z′, but depends on the Z-Z′ mass ratio.Chinese Physics C 01/2012; 36(4):298-306. · 0.34 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We investigate a double extension to the Standard Model (SM). A first extension introduces, via minimal coupling, a massive $Z'$ boson. This enlarged SM is coupled to a dark matter sector through the Stueckelberg mechanism by a $A'$ boson. However, the $A'$ boson does not interact directly with the SM fermions. In our study, we found that the $A'$ is a massless photon-like particle in dark sector. Constraints on the mass for $Z'$ and corrections to $Z$ mass are obtained.International Journal of Modern Physics Conference Series. 07/2012; - [Show abstract] [Hide abstract]

**ABSTRACT:**We discuss the possibility of having multiple Kaluza-Klein (KK) dark matter candidates which arise naturally in generic Type-IIB string theory compactification scenarios. These dark matter candidates reside in various throats of the Calabi-Yau manifold. In principle, they can come with varied range of masses in four-dimensions depending upon the hierarchical warping of the throats. We show that consistency with cosmological bounds and four-dimensional effective theory description imposes strong constraints on the parameter space and the geometry of the throats. With a rather model-independent approach, we find that the mass scales allowed for the KK dark matter particles in various throats can vary between 0.1 eV and 10 TeV. Thus, there could be simultaneously more than one kind of cold (and possibly warm and hot) dark matter components residing in the Universe. This multiple dark matter scenario could weaken the bound on a conventional supersymmetric dark matter candidate and even act as an extra relativistic degree of freedom.Physical review D: Particles and fields 11/2012; 87(6).

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