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We analyze the prospects for resonant di-Higgs production searches at the LHCin the $b\bar{b} W^+ W^-$ ($W^{+} \to \ell^{+} \nu_{\ell}$, $W^{-} \to \ell^{-}\bar{\nu}_{\ell}$) channel, as a probe of the nature of the electroweak phasetransition in Higgs portal extensions of the Standard Model. In order tomaximize the sensitivity in this final state, we develop a new algorithm forthe reconstruction of the $b \bar{b} W^+ W^-$ invariant mass in the presence ofneutrinos from the $W$ decays, building from a technique developed for thereconstruction of resonances decaying to $\tau^{+}\tau^{-}$ pairs. We show thatresonant di-Higgs production in the $b\bar{b} W^+ W^-$ channel could be acompetitive probe of the electroweak phase transition already with the datasetsto be collected by the CMS and ATLAS experiments in Run-2 of the LHC. Theincrease in sensitivity with larger amounts of data accumulated during the HighLuminosity LHC phase can be sufficient to enable a potential discovery of theresonant di-Higgs production in this channel.

Resonant Di-Higgs Production in the $b{\bar b}WW$ Channel: Probing the Electroweak Phase Transition at the LHC