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[**Diboson-Jets and the Search for\
Resonant $Zh$ Production**]{} 1.0cm [Minho Son$^1$, Christian Spethmann$^2$, and Brock Tweedie$^2$]{} 0.4cm [*$^1$Department of Physics, Yale University, New Haven, CT 06511*]{}\
[*$^2$Physics Department, Boston University, Boston, MA 02215*]{} 2.5cm

New particles at the TeV-scale may have sizeable decay rates into boosted Higgs bosons or other heavy scalars. Here, we investigate the possibility of identifying such processes when the Higgs/scalar subsequently decays into a pair of $W$ bosons, constituting a highly distinctive “diboson-jet.” These can appear as a simple dilepton (plus ) configuration, as a two-prong jet with an embedded lepton, or as a four-prong jet. We study jet substructure methods to discriminate these objects from their dominant backgrounds. We then demonstrate the use of these techniques in the search for a heavy spin-one $Z'$ boson, such as may arise from strong dynamics or an extended gauge sector, utilizing the decay chain $Z' \to Zh \to Z(WW^{(*)})$. We find that modes with multiple boosted hadronic $Z$s and $W$s tend to offer the best prospects for the highest accessible masses. For 100 fb$^{-1}$ luminosity at the 14 TeV LHC, $Z'$ decays into a standard 125 GeV Higgs can be observed with 5$\sigma$ significance for masses of 1.5–2.5 TeV for a range of models. For a 200 GeV Higgs (requiring nonstandard couplings, such as fermiophobic), the reach may improve to up to 2.5–3.0 TeV.

Introduction {#sec:intro}
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Tagging Diboson-Jets {#sec:jetsub}
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$Z' \to Zh$ Search {#sec:results}
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Conclusions {#sec:conclusion}
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Analysis Details {#sec:details}
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Detector Model {#sec:detector}
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