Journal of High Energy Physics

, 2019:59 | Cite as

Multipartite dark matter with scalars, fermions and signatures at LHC

  • Subhaditya BhattacharyaEmail author
  • Purusottam Ghosh
  • Narendra Sahu
Open Access
Regular Article - Theoretical Physics


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 (χ1, χ2) and a doublet (N). Stability of the two DM components is achieved by a discrete \( {\mathcal{Z}}_2 \times {\mathcal{Z}}_2^{\prime } \) symmetry, under which the additional fields transform suitably. Fermion fields having same \( {\mathcal{Z}}_2 \times {\mathcal{Z}}_2^{\prime } \) charge (N, χ1 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 (χ2) 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.


Beyond Standard Model Cosmology of Theories beyond the SM 


Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2019

Authors and Affiliations

  • Subhaditya Bhattacharya
    • 1
    Email author
  • Purusottam Ghosh
    • 1
  • Narendra Sahu
    • 2
  1. 1.Department of PhysicsIndian Institute of Technology GuwahatiNorth GuwahatiIndia
  2. 2.Department of Physics, Indian Institute of Technology HyderabadSangareddyIndia

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