Signatures for Horizontal Gauge Bosons in Very Energetic Hadronic Collisions

The signatures for horizontal-gauge-boson production at a $\sqrt{s}=40\mathrm{}$-TeV hadronic collider are studied. Production and decay of the boson leads to very massive lepton pairs (such as $e\mu$ or $\mu \tau$) 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 background. 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.