Abstract
We consider simplified dark matter models (DM) interacting gravitationally with the standard model (SM) particles in a Randall-Sundrum (RS) framework. In this framework, the DM particles interact through the exchange of spin-2 Kaluza-Klein (KK) gravitons in the s-channel with the SM particles. The parameter space of the RS model with universal couplings to SM particles is known to be strongly constrained from the LHC data. We are thus led to consider models with non-universal couplings. The first model we consider in this study is a top-philic graviton model in which only the right-handed top quarks are taken to interact strongly with the gravitons. In the second, the lepto-philic model, we assume that only the right-handed charged leptons interact strongly with the gravitons. We extend the study to include not only the scalar, vector and spin-1/2 fermions but also spin-3/2 fermionic dark matter. We find that there is a large parameter space in these benchmark models where it is possible to achieve the observed relic density consistent with the direct and indirect searches and yet not to be constrained from the LHC data.
Highlights
(2016) [2], LUX [3], XENON [4], and PANDA [5]
It was observed that in most of the benchmark models considered in the literature, the desired values of the relic density could only be attained for the case of vector dark matter models (DM) with mass near the s-channel KK graviton resonance [23] or for very low Graviton and DM mass [22] in a very narrow window in the parameter space
Model A In the first benchmark model (Top-philic KK graviton) the right-handed topquarks alone are assumed to be located on the IR brane, SU(3)C and U(1)Y gauge bosons live in the bulk and the rest of the standard model (SM) fields including the SU(2)L gauge bosons live on the UV brane or close to it
Summary
In the Randall-Sundrum framework, the particle interaction with the massive spin-2 gravitons Yμν is purely gravitational and is through the energy-momentum tensor being given by. Model A In the first benchmark model (Top-philic KK graviton) the right-handed topquarks alone are assumed to be located on the IR brane, SU(3)C and U(1)Y gauge bosons live in the bulk and the rest of the SM fields including the SU(2)L gauge bosons live on the UV brane or close to it. Model B In the second benchmark model (lepto-philic KK graviton), the right-handed leptons are assumed to live on the IR brane and only the U(1)Y gauge bosons are assumed to live in the bulk with the rest of the SM particles including the gauge bosons live close to or on the UV brane. The coupling can be somewhat suppressed with the use of brane localised kinetic terms These comparatively strongly coupled gauge KK states will result in strong constraints on their masses from the electroweak precision data.
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