  In this note we establish LHC limits on a variety of benchmark models for
hidden sector physics using 2011 and 2012 data. First, we consider a "hidden"
U(1) gauge boson under which all Standard Model particles are uncharged at
tree-level and which interacts with the visible sector either via kinetic
mixing or higher dimensional operators. Second, we constrain scalar and
pseudo-scalar particles interacting with the Standard Model via dimension five
operators and Yukawa interactions, in particular including so-called axion-like
particles. In both cases we consider several different final states, including
photons, electrons, muons and taus, establishing new constraints for a range of
GeV to TeV scale masses. Finally, we also comment on particles with electric
charges smaller than e that arise from hidden sector matter.
