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We study the scalar triplet extension of the standard model with a lowcutoff, preventing large corrections to the quadratic masses that wouldotherwise worsen the hierarchy problem. We explore the reach of LISA to testthe parameter space region of the scalar potential (not yet excluded by Higgsto diphoton measurements) in which the electroweak phase transition is stronglyfirst-order and produces sizeable gravitational waves. We also demonstrate thatthe collider phenomenology of the model is drastically different from itsrenormalizable counterpart. We study the reach of the LHC in ongoing searchesand project bounds for the HL-LHC. Likewise, we develop a dedicated analysis totest the key but still unexplored signature of pair-production of chargedscalars decaying to third-generation quarks: $pp\rightarrow t\overline{b}(\overline{t}b), b\overline{b}$. These results apply straightforwardly to otherextensions of the Higgs sector such as the 2HDM/MSSM.

Gravitational wave and collider probes of a triplet Higgs sector with a low cutoff