Searching for axion-like particles with ultra-peripheral heavy-ion   collisions
  We show that ultra-peripheral heavy-ion collisions at the LHC can be used to search for axion-like particles with mass below 100 GeV. The $Z^4$ enhanced photon-photon luminosity from the ions provides a large exclusive production rate, with a signature of a resonant pair of back-to-back photons and no other activity in the detector. In addition, we present both new and updated limits from recasting multi-photon searches at LEP II and the LHC, which are more stringent than those currently in the literature for the mass range 100 MeV to 100 GeV. 
Simon Knapen, Tongyan Lin, Hou Keong Lou, and Tom Melia
hep-ph hep-ex