Two-Step Electroweak Symmetry-Breaking: Theory Meets Experiment
arXiv:2001.05335 · doi:10.1007/JHEP05(2020)050
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 is excluded at confidence level.
arXiv comment31 pages, 10 figures. Updated to match version published in JHEP
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