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Current searches for the charged Higgs at the LHC focus only on the$\tau\nu$, $cs$, and $tb$ final states. Instead, we consider the process $pp\to\Phi\to W^\pm H^\mp \to W^+ W^- A$ where $\Phi$ is a heavy neutral Higgs boson,$H^\pm$ is a charged Higgs boson, and $A$ is a light Higgs boson, with masseither below or above the $b\bar{b}$ threshold. The cross-section for thisprocess is typically large when kinematically open since $H^\pm \to W^\pm A$can be the dominant decay mode of the charged Higgs. The final state weconsider has two leptons and missing energy from the doubly leptonic decay ofthe $W^+ W^-$ and possibly additional jets; it is therefore constrained byexisting SM Higgs searches in the $W^+ W^-$ channel. We extract theseconstraints on the cross-section for this process as a function of the massesof the particles involved. We also apply our results specifically to a type-IItwo Higgs doublet model with an extra Standard-Model-singlet and obtain new andpowerful constraints on $m_{H^\pm}$ and $\tan\beta$. We point out that aslightly modified version of this search, with more dedicated cuts, could beused to possibly discover the charged Higgs, either with existing data or inthe future.

A New Avenue to Charged Higgs Discovery in Multi-Higgs Models