Installing a Milli-charge Particle Detector at LHC P5

Our collaboration has proposed a dedicated experiment that would detect ``milli-charged'' particles produced in pp collisions. The experiment, which would be a plastic scintillator array subdivided into three sections, should be sensitive to charges of order ${10}^{-3}e$ for mass of order 1 GeV and charges of order ${10}^{-2}e$ for mass of order $10\thinspace $ GeV with $300$ fb$^{\mathrm{-1\thinspace }}$of integrated luminosity. This greatly extends the parameter space explored for small mass charges above 100 MeV.