Single production of fourth-family t' quarks at the CERN Large Hadron electron Collider

The proposed Large Hadron electron Collider (LHeC) would consist of a new linear accelerator or storage rinG to collide electrons with energy of 70 - -140 GeV with the existing 7 TeV proton beam from the LHC. We study the electroweak single production of fourth-family t' quarks via the process ep → t'ν at LHeC. We calculate the background and signal cross-sections for the mass range 300 - 800 GeV. It is shown that the LHeC can discover a single t' quark up to the mass of 750 GeV for the optimized mixing parameters. (authors)