  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.
