Probing Stealth Dark Sectors with LHCb

In this chapter we review the existing public searches for dark sectors performed by the LHCb collaboration. We start first by discussing the main differences between the LHCb detector and the previously described ATLAS and CMS, as these shape the search program. Owing to its design LHCb has an upper hand for probing dark sectors with masses in the GeV range, and/or particles with macroscopic lifetimes. We describe four searches in detail: three for new physics candidates directly produced from the proton-proton collisions and decaying into muons and light hadrons, and one for dark matter candidates produced from B-meson decays.