Under current constraints, the inert triplet model is insufficient for dark matter and for a first-order phase transition, while the non-inert triplet model retains a narrow 150 to 275 GeV window for a strong two-step transition and detectable gravitational waves.
Two-Step Electroweak Symmetry-Breaking: Theory Meets Experiment
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abstract
We study the phenomenology of a hypercharge-zero SU(2) triplet scalar whose existence is motivated by two-step electroweak symmetry-breaking. We consider both the possibility that the triplets are stable and contribute to the dark matter density, or that they decay via mixing with the standard model Higgs boson. The former is constrained by disappearing charged track searches at the LHC and by dark matter direct detection experiments, while the latter is constrained by existing multilepton collider searches. We find that a two-step electroweak phase transition involving a stable triplet with a negative quadratic term is ruled out by direct detection searches, while an unstable triplet with a mass less than $230\ \mathrm{GeV}$ is excluded at $95\%$ confidence level.
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Dark clouds to silver linings over the hyperchargeless scalar triplets
Under current constraints, the inert triplet model is insufficient for dark matter and for a first-order phase transition, while the non-inert triplet model retains a narrow 150 to 275 GeV window for a strong two-step transition and detectable gravitational waves.