Multipartite Dark Matter with Scalars, Fermions and signatures at LHC

Abstract

Basic idea of this analysis is to achieve a two-component dark matter (DM) framework composed of a scalar and a fermion, with non-negligible DM-DM interaction contributing to thermal freeze out (hence relic density), but hiding them from direct detection bounds. We therefore augment the Standard Model (SM) with a scalar singlet ($S$) and three vectorlike fermions: two singlets (${\chi }_1,{\chi }_2$) and a doublet ($N$). Stability of the two DM components is achieved by a discrete ${\mathcal{Z}}_2\times {{\mathcal{Z}}^{\prime }}_2$ symmetry, under which the additional fields transform suitably. Fermion fields having same ${\mathcal{Z}}_2\times {{\mathcal{Z}}^{\prime }}_2$ charge ($N,{\chi }_1$ in the model) mix after electroweak symmetry breaking (EWSB) and the lightest component becomes one of the DM candidates, while scalar singlet $S$ is the other DM component connected to visible sector by Higgs portal coupling. The heavy fermion (${\chi }_2$) plays the role of mediator to connect the two DM candidates through Yukawa interaction. This opens up a large parameter space for the heavier DM component through DM-DM conversion. Hadronically quiet dilepton signature, arising from the fermion dark sector, can be observed at Large Hadron Collider (LHC) aided by the presence of a lighter scalar DM component, satisfying relic density and direct search bounds through DM-DM conversion.

arXiv commentA section discussing the possible connection to inflation is added. The version is published in JHEP

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