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

Abstract

We analyze the prospects for resonant di-Higgs production searches at the LHC in 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 phase transition in Higgs portal extensions of the Standard Model. In order to maximize the sensitivity in this final state, we develop a new algorithm for the reconstruction of the $b\bar{b}{W}^{+}{W}^{-}$ invariant mass in the presence of neutrinos from the $W$ decays, building from a technique developed for the reconstruction of resonances decaying to ${\tau }^{+}{\tau }^{-}$ pairs. We show that resonant di-Higgs production in the $b\bar{b}{W}^{+}{W}^{-}$ channel could be a competitive probe of the electroweak phase transition already with the datasets to be collected by the CMS and ATLAS experiments in Run-2 of the LHC. The increase in sensitivity with larger amounts of data accumulated during the High Luminosity LHC phase can be sufficient to enable a potential discovery of the resonant di-Higgs production in this channel.

arXiv comment26 Pages, 8 Figures

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