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Prospects for the study of Higgs boson pair (HH) production in the HH→ bb̄4l (l = e, μ) channel are studied in the context of the High Luminosity LHC. The analysis is performed using a parametric simulation of the Phase-2 CMS detector response provided by the Delphes software and assuming an average of 200 proton-proton collisions per bunch crossing at a center-of-mass energy of 14 TeV. Assuming a projected integrated luminosity of 3000 fb−1, the expected significance for the nonresonant standard model (SM) HH signal is 0.37 σ ; a 95% confidence level (CL) upper limit on its cross section is set to 6.6 times the SM prediction. The statistical combination of five decay channels (bb̄bb̄, bb̄ττ , bb̄γγ , bb̄WW, bb̄ZZ) results in an expected significance for the SM HH signal of 2.6 σ and an expected 68% and 95% CL intervals for the self-coupling modifier κλ = λHHH/λ SM HHH of [0.35,1.9] and [−0.18,3.6], respectively.

Projections for HH measurements in the bbZZ(4l) final state with the CMS experiment at the HL-LHC