SU(2)${}_L\times$SU(2)${}_R$ minimal dark matter with 2 TeV $W^{\prime }$

Abstract

We construct the minimal dark matter models in the left-right symmetric extensions of the standard model (SM), where the gauge symmetry SU(3)${}_C\times$SU(2)${}_L\times$SU(2)${}_R\times$U(1)${}_{B-L}$ is broken into its subgroup SU(3)${}_C\times$U(1)${}_{\mathrm{em}}$ by nonzero VEVs of a SU(2)${}_R$ doublet $H_R$ and a SU(2)${}_L\times$ SU(2)${}_R$ bidoublet $H$. A possible candidate of dark matter is explored in the framework of minimal dark matter considering SU(2)${}_{L,R}$ multiplet scalar bosons and fermions. Then we focus on SU(2)${}_R$ quintuplet fermions with $B-L$ charges 0, 2 and 4 as the minimal dark matter candidates and investigate phenomenology of them. We show that the dark matter in the model can provide observed relic density with 2 TeV $W^{\prime }$ boson which is motivated by the ATLAS diboson excess and CMS $eejj$ excess. The possible mass of dark matter is predicted for each $B-L$ charge. We then estimate the scattering cross section of dark matter with nucleon and production cross section of charged components in the quintuplets at the LHC.

Comments: 12 pages, 11 figures, version published in Phys. Lett. B