High-luminosity colliders and fixed-target facilities using proton beams are sensitive to new weakly coupled degrees of freedom across a broad mass range. In this talk, we will discuss various production modes for dark vector particles in proton beam experiments. First, we will set the stage by reviewing light physics models, including new vector particles, discuss how these models could solve the shortcomings of the SM, and present some current and future search strategies. After briefly discussing dark photon production in meson decays and Drell-Yan, we will have a closer look at dark bremsstrahlung. Dark bremsstrahlung is particularly important for dark vectors with masses between 0.5-1.5 GeV due to resonant mixing with hadronic resonances. This production mode will be crucial for sensitivity predictions for future experiments like SHiP and proposals like the Forward Physics Facility. We revisit the calculation of dark photons via initial state radiation in non-single diffractive scattering, using an improved approach to the splitting function and the timelike electromagnetic form factor.
