Light Doubly Charged Higgs Boson via the WW* Channel at LHC

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The doubly charged Higgs bosons H±± searches at the Large Hadron Collider (LHC) have been studied extensively and strong bound is available for H±± dominantly decaying into a pair of same-sign di-leptons. In this paper we point out that there is a large cavity in the light H±± mass region left unexcluded. In particular, H±± can dominantly decay into WW or WW* (For instance, in the type-II seesaw mechanism the triplet acquires a vacuum expectation value around 1 GeV.), and then it is found that H±± with mass even below 2mW remains untouched by the current collider searches. Searching for such a H±± at the LHC is the topic of this paper. We perform detailed signal and background simulation, especially including the non-prompt tt background which is the dominant one nevertheless ignored before. We show that such H±± should be observable at the 14 TeV LHC with 10-30 fb⁻¹ integrated luminosity.