Speaker
Barbara Mele
(ROMA1)
Description
A prediction of recent models possibly explaining the fermion-mass hierarchy
is the existence of a massless dark photon. Its interaction is restricted to
a hidden sector made up of massive dark fermions (which are promising
dark-matter candidates), and heavier scalar messengers connecting the SM
with the dark fields. Thanks to the nondecoupling properties of the Higgs
boson, exotic Higgs interactions with the invisible dark photon can show up
at present and future colliders with measurable rates. Predictions for new
Higgs signatures and corresponding rates are presented. A new class of
FCNC’s mediating SM fermion decays into massless dark photons are also
discussed.
