Regular Article - Theoretical Physics
Distinguishing inert Higgs doublet and inert triplet scenarios
Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telengana, 502287, India
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Accepted: 21 July 2020
Published online: 8 August 2020
In this article we consider a comparative study between Type-I 2HDM and , SU(2) triplet extensions having one -odd doublet and triplet that render the desired dark matter(DM). For the inert doublet model (IDM) either a neutral scalar or pseudoscalar can be the DM, whereas for inert triplet model (ITM) it is a CP-even scalar. The bounds from perturbativity and vacuum stability are studied for both the scenarios by calculating the two-loop beta functions. While the quartic couplings are restricted to for a Planck scale perturbativity for IDM, these are much relaxed (0.8 ) for ITM. The RG-improved potentials by Coleman-Weinberg show the regions of stability, meta-stability and instability of the electroweak vacuum. The constraints coming from DM relic, the direct and indirect experiments like XENON1T, LUX and H.E.S.S., Fermi-LAT allow the DM mass GeV for IDM, ITM respectively. Though mass-splitting among -odd particles in IDM is a possibility for ITM we have to rely on loop-corrections. The phenomenological signatures at the LHC show that the mono-lepton plus missing energy with prompt and displaced decays in the case of IDM and ITM can distinguish such scenarios at the LHC along with other complementary modes.
© The Author(s), 2020