Electroweak interacting dark matter with a singlet scalar portal

Abstract

We investigate an electroweak interacting dark matter (DM) model in which the DM is the neutral component of the SU$(2{)}_L$ triplet fermion that couples to the standard model (SM) Higgs sector via an SM singlet Higgs boson. In this setup, the DM can have a CP-violating coupling to the singlet Higgs boson at the renormalizable level. As long as the nonzero Higgs portal coupling (singlet-doublet Higgs boson mixing) exists, we can probe CP violation of the DM via the electric dipole moment of the electron. Assuming the $\mathcal{O}(1)$ CP-violating phase in magnitude, we investigate the relationship between the electron EDM and the singlet-like Higgs boson mass and coupling. It is found that for moderate values of the Higgs portal couplings, current experimental EDM bound is not able to exclude the wide parameter space due to a cancellation mechanism at work. We also study the spin-independent cross section of the DM in this model. It is found that although a similar cancellation mechanism may diminish the leading-order correction, as often occurs in the ordinary Higgs portal DM scenarios, the residual higher-order effects leave an $\mathcal{O}(10^{-47}){\mathrm{cm}}^2$ correction in the cancellation region. It is shown that our benchmark scenarios would be fully tested by combining all future experiments of the electron EDM, DM direct detection and Higgs physics.

17 pages, 6 figures. v2: references added; v3: references added, version to appear in Phys.Lett.B

References in corpus (11)

• Big-Bang Nucleosynthesis
• Cosmology and Astrophysics of Minimal Dark Matter
• Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Standard Model anatomy of WIMP dark matter direct detection II: QCD analysis and hadronic matrix elements
• ILC Operating Scenarios
• Improved sphaleron decoupling condition and the Higgs coupling constants in the real singlet-extended SM
• Direct Search of Dark Matter in High-Scale Supersymmetry
• Electroweakly-Interacting Dirac Dark Matter
• Effective Interaction of Electroweak-Interacting Dark Matter with Higgs Boson and Its Phenomenology

Cited by in corpus (5)

• Toward verification of electroweak baryogenesis by electric dipole moments
• Interplay of Scalar and Fermionic Components in a Multi-component Dark Matter Scenario
• Dark Matter, Muon $g-2$, Electric Dipole Moments and $Z\to {\ell }_i^{+}{\ell }_j^{-}$ in a One-Loop Induced Neutrino Model
• Impact of the 125 GeV Higgs boson on the singlet fermion dark matter searches at the LHC
• Non-Thermal Production of Sexaquark Dark Matter