Department of Physics and Astronomy: Publications and Other Research


Date of this Version



JHEP 05 (2022) 005.


Open access.


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 13TeV 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 4.5TeV 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 ⟶ b[]WW* ⟶ b[]ℓvq[]' and the dilepton decay channels HH ⟶ b[]WW* ⟶ b[]ℓvℓv and HH ⟶ b[]ττ ⟶ b[]ℓvvℓvv are examined, where ℓ in the final state corresponds to an electron or muon. The signal is extracted using a two-dimensional maximum likelihood fit of the H ⟶ 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 ⟶ HH signatures with final-state leptons and at some masses provide the most sensitive limits of all X ⟶ HH searches.

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