A Letter of Intent to Install a milli-charged Particle Detector at LHC   P5
  In this LOI we propose a dedicated experiment that would detect "milli-charged" particles produced by pp collisions at LHC Point 5. The experiment would be installed during LS2 in the vestigial drainage gallery above UXC and would not interfere with CMS operations. With 300 fb$^{-1}$ of integrated luminosity, sensitivity to a particle with charge $\mathcal{O}(10^{-3})~e$ can be achieved for masses of $\mathcal{O}(1)$ GeV, and charge $\mathcal{O}(10^{-2})~e$ for masses of $\mathcal{O}(10)$ GeV, greatly extending the parameter space explored for particles with small charge and masses above 100 MeV. 
Austin Ball, Jim Brooke, Claudio Campagnari, Albert De Roeck, Brian   Francis, Martin Gastal, Frank Golf, Joel Goldstein, An...
physics.ins-det hep-ex