The addition of a Higgs quadruplet to the standard model (SM) of quarks and leptons would shift the $W$-boson mass upward. It could also facilitate the production of dark matter through the conventional thermal freeze-out scenario via Yukawa interaction with the Higgs quadruplet or freeze-in production from the decay of SM Higgs. We investigate the same-sign lepton smoking gun signature of the double-charged scalar component of the quadruplet Higgs at the LHC.

• Received 19 January 2024
• Accepted 26 March 2024

DOI:https://doi.org/10.1103/PhysRevD.109.075039

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Published by the American Physical Society