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Projection studies of Higgs boson pair production to the 4 b-jet final state at the HL-LHC using the ATLAS detector Sam, Colm


Projection studies for the non-resonant Higgs boson pair production in the 4 b-jet final state with the ATLAS detector at the HL-LHC are presented. They are based on extrapolated results of the latest Run 2 analysis which targeted both the gluon-gluon fusion and vector-boson fusion Higgs boson pair production modes and exploited 126 fb⁻¹ of √s = 13 TeV data. The projection assumes an integrated luminosity of 3000 fb⁻¹ for HL-LHC proton-proton collisions at √s = 14 TeV. Various systematic uncertainty scenarios are explored. With (without) systematic uncertainties, the discovery significance of the Standard Model Higgs boson pair production is found to be 1.0σ (1.8σ), while the 95% confidence-level upper limit on the HH signal strength is set at 2.0 (1.1). The allowed 68% confidence-interval for the HHH coupling modifier κ𝛌 is found to be [−0.5, 6.1] ([0.1, 2.6]), while the allowed 68% confidence-interval for the HHVV coupling modifier κ2V is [0.7, 1.4] ([]).

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