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In the context of two-Higgs doublet models, we explore the possibility ofsearching for heavy Higgs bosons in the $t \bar t Z$ and $t bW$ final states.We develop realistic analyses strategies and in the case of the $t \bar t Z$channel provide a detailed evaluation of the new-physics reach at the 14 TeVLHC. We find that already with an integrated luminosity of $300 \, {\rmfb}^{-1}$ searches for the $t \bar t Z$ signature can provide statisticallysignificant constraints at low values of $\tan \beta$ for heavy Higgs masses inthe range from around $450 \, {\rm GeV}$ to $1150 \, {\rm GeV}$. Futuresearches for heavy Higgses in the $tbW$ final state are also expected to beable to probe parts of this parameter space, though the precise constraintsturn out to depend sensitively on the assumed systematics on the shape of the$t \bar t$ background.

Searching for heavy Higgs bosons in the $t \bar t Z$ and $t b W$ final states