Bilepton production at hadron colliders

We examine, as model-independently as possible, the production of bileptons at hadron colliders. When a particular model is necessary or useful, we choose the 3-3-1 model. We consider a variety of processes: $q\overline{q}\ensuremath{\rightarrow}{Y}^{++}{Y}^{\ensuremath{-}\ensuremath{-}},$ $u\overline{d}\ensuremath{\rightarrow}{Y}^{++}{Y}^{\ensuremath{-}},$ $\ifmmode \bar{u}\else \={u}\fi{}\stackrel{\ensuremath{\rightarrow}}{d}{Y}^{+}{Y}^{\ensuremath{-}\ensuremath{-}},$ $q\overline{q}\ensuremath{\rightarrow}{Y}^{++}{e}^{\ensuremath{-}}{e}^{\ensuremath{-}},$ $q\overline{q}\ensuremath{\rightarrow}{\ensuremath{\varphi}}^{++}{\ensuremath{\varphi}}^{\ensuremath{-}\ensuremath{-}},$ $u\overline{d}\ensuremath{\rightarrow}{\ensuremath{\varphi}}^{++}{\ensuremath{\varphi}}^{\ensuremath{-}},$ and $\ifmmode \bar{u}\else \={u}\fi{}\stackrel{\ensuremath{\rightarrow}}{d}{\ensuremath{\varphi}}^{+}{\ensuremath{\varphi}}^{\ensuremath{-}\ensuremath{-}},$ where $Y$ and \ensuremath{\varphi} are vector and scalar bileptons, respectively. Given the present low-energy constraints, we find that, at the Fermilab Tevatron, vector bileptons are unobservable, while light scalar bileptons ${(M}_{\ensuremath{\varphi}}\ensuremath{\lesssim}300\mathrm{GeV})$ are just barely observable. At the CERN LHC, the reach is extended considerably: vector bileptons of mass ${M}_{Y}\ensuremath{\lesssim}1\mathrm{TeV}$ are observable, as are scalar bileptons of mass ${M}_{\ensuremath{\varphi}}\ensuremath{\lesssim}850\mathrm{GeV}.$