  We study baryogenesis via a gaugino portal, the supersymmetric counterpart to
the widely studied kinetic mixing portal, to a hidden sector. CP and baryon
number violating decays of a hidden sector gaugino into the visible sector can
produce the observed baryon asymmetry of the Universe. The tiny portal coupling
is crucial in producing late out-of-equilibrium decays, after washout processes
that can erase the asymmetry have gone out of equilibrium. We study this
mechanism within various scenarios, including freeze-in or freeze-out of the
hidden gaugino, as well as extended frameworks where the hidden sector contains
a weakly interacting massive particle (WIMP) dark matter candidate. This
mechanism can produce the desired asymmetry over a wide range of mass scales,
including for hidden gaugino masses as low as 10 GeV. We also discuss possible
related signals with direct collider searches, at low energy experiments, and
in dark matter direct and indirect detection.
