  A search for sub-GeV dark matter produced from collisions of the Fermilab 8
GeV Booster protons with a steel beam dump was performed by the MiniBooNE-DM
Collaboration using data from $1.86 \times 10^{20}$ protons on target in a
dedicated run. The MiniBooNE detector, consisting of 818 tons of mineral oil
and located 490 meters downstream of the beam dump, is sensitive to a variety
of dark matter initiated scattering reactions. Three dark matter interactions
are considered for this analysis: elastic scattering off nucleons, inelastic
neutral pion production, and elastic scattering off electrons. Multiple data
sets were used to constrain flux and systematic errors, and time-of-flight
information was employed to increase sensitivity to higher dark matter masses.
No excess from the background predictions was observed, and 90$\%$ confidence
level limits were set on the vector portal and leptophobic dark matter models.
New parameter space is excluded in the vector portal dark matter model with a
dark matter mass between 5 and 50$\,\mathrm{MeV}\,c^{-2}$. The reduced neutrino
flux allowed to test if the MiniBooNE neutrino excess scales with the
production of neutrinos. No excess of neutrino oscillation events were measured
ruling out models that scale solely by number of protons on target independent
of beam configuration at 4.6$\sigma$.
