WH production at hadron colliders

We have examined the production of a charged Higgs boson in association with a W boson at high-energy hadron colliders, i.e., ppWH+X, and find that the production rates can be large. The various subprocesses which contribute to this mechanism at the tree and one-loop levels are compared and we find that quark annihilation bb, ttWH is dominant. Production via gluon-gluon fusion, which proceeds through box and triangle diagrams, is also found to yield a significant contribution. We also compare our results with those obtained in rank-5 E6 models for this process.