Search for heavy resonances decaying to a pair of Lorentz-boosted Higgs bosons in final states with leptons and a bottom quark pair at $\sqrt{s}=$ 13 TeV

Abstract

A search for new heavy resonances decaying to a pair of Higgs bosons (HH) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. Data were collected with the CMS detector at the LHC in 2016-2018, corresponding to an integrated luminosity of 138 fb${}^{-1}$. Resonances with a mass between 0.8 and 4.5 TeV are considered using events in which one Higgs boson decays into a bottom quark pair and the other into final states with either one or two charged leptons. Specifically, the single-lepton decay channel HH $\to$ $\mathrm{b}\bar{\mathrm{b}}$WW${}^{\ast }$ $\to$ $\mathrm{b}\bar{\mathrm{b}}\ell \nu q{\bar{q}}^{\prime }$ and the dilepton decay channels HH $\to$ $\mathrm{b}\bar{\mathrm{b}}$WW${}^{\ast }$ $\to$ $\mathrm{b}\bar{\mathrm{b}}\ell \nu \ell \nu$ and HH $\to$ $\mathrm{b}\bar{\mathrm{b}}\tau \tau$ $\to$ $\mathrm{b}\bar{\mathrm{b}}\ell \nu \nu \ell \nu \nu$ are examined, where $\ell$ in the final state corresponds to an electron or muon. The signal is extracted using a two-dimensional maximum likelihood fit of the H $\to$ $\mathrm{b}\bar{\mathrm{b}}$ jet mass and HH invariant mass distributions. No significant excess above the standard model expectation is observed in data. Model-independent exclusion limits are placed on the product of the cross section and branching fraction for narrow spin-0 and spin-2 massive bosons decaying to HH. The results are also interpreted in the context of radion and bulk graviton production in models with a warped extra spatial dimension. The results provide the most stringent limits to date for X $\to$ HH signatures with final-state leptons and at some masses provide the most sensitive limits of all X $\to$ HH searches.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-20-007 (CMS Public Pages)

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