Single production of doubly charged Higgs bosons at hadron colliders

We reconsider the single production of the doubly charged Higgs bosons ∆ R and ∆ ++ L at the LHC and TEVATRON in the framework of the left-right symmetric model and the Higgs triplet model. We show that in the left-right symmetric model the production of ∆ R by Drell-Yan process via WR exchange may give the dominant contribution. The same channel for the production of ∆ L in the Higgs triplet model is insignificant.