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×SU(2)L×SU(2)R×U(1)B−L is broken into its subgroup SU(3)C×U(1)em by nonzero VEVs of a SU(2)R doublet HR and a SU(2)L×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 their phenomenology. We show that the dark matter in the model can provide observed relic density with 2 TeV W′ 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.
Highlights
The Standard Model (SM) based on SU(3)×SU(2)L×U(1)Y has been very successful in describing particle physics phenomena from low energy to ∼ TeV
Still it suffers from a number of phenomenological drawbacks such as neutrino masses and mixings, nonbaryonic dark matter (DM) and matter-antimatter asymmetry as well as cosmological inflation, not even mentioning theoretical puzzles such as fine tuning of Higgs mass, the origin of flavor and generation, and strong CP problem, etc
We show that properties of the minimal DM such as the mass splitting within the multiplet are different from that in the canonical LR models [20]
Summary
The Standard Model (SM) based on SU(3)×SU(2)L×U(1)Y has been very successful in describing particle physics phenomena from low energy to ∼ (a few) TeV. The LR symmetry is assumed to be spontaneously broken into U(1)em by nonzero VEVs of ∆R and φ This setup has been studied extensively, including flavor physics [9,10,11,12,13,14,15,16,17,18,19], minimal DM [20] and right-handed neutrino DM [21, 22]. We note that inverse seesaw mechanism can be applied introducing gauge singlet fermions [23,24,25] This simpler setup including SU(2)L doublet Higgs has been studied recently [26], mainly motivated by the ATLAS 2 TeV diboson excess [27] where a moderate excess is found by CMS [28, 29]. We estimate DM-nucleon scattering cross section for DM direct detection and production cross section of charged components in the DM multiplet at the LHC Run 2
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