Signatures for horizontal gauge bosons in very energetic hadronic collisions

The signatures for horizontal-gauge-boson production at a √s = 40 TeV hadronic collider are studied. Production and decay of the boson leads to very massive lepton pairs (such as eμ or μtau) in an otherwise quiet event, providing a clean signature. Backgrounds are studied with the Lund Monte Carlo model. The dominant background comes from W+W- pairs, but there is good separation of the signal from the backgrround. The identification of tau may be important for horizontal bosons; we note that the tau path lengths could be many tens of centimeters, suggesting new possibilities for their identification