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A bstract A search is presented for non-resonant Higgs boson pair production, targeting the bbZZ, 4 V (V = W or Z), VVττ, 4 τ, γγVV and γγττ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of proton-proton collisions at s s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb − 1. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 17 (11) times the Standard Model predicted cross-section at 95% confidence level under the background-only hypothesis. The observed (expected) constraints on the HHH coupling modifier, κ λ, are determined to be −6. 2 < κ λ < 11. 6 (−4. 5 < κ λ < 9. 6) at 95% confidence level, assuming the Standard Model for the expected limits and that new physics would only affect κ λ.
Aad et al. (Wed,) studied this question.