HL-LHC prospects for the search of boosted Higgs boson pair production via vector-boson fusion in the bb̄bb̄ final state at the ATLAS experiment

Projection studies for non-resonant Higgs boson pair production via vector-boson-fusion in the bbbb final state with the ATLAS detector at the High Luminosity LHC (HL-LHC) phase are presented. The presented studies are the first HL-LHC prospects on the boosted di-Higgs topology, where each Higgs boson is constructed as a single large-radius jet. The latest Run 2 analysis results using $140$ fb⁻¹ of proton–proton collision data at √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider are considered as a baseline point. Sensitivities are projected assuming a center-of-mass energy of √s = 14 TeV for a variety of integrated luminosities ranging from 1000 fb⁻¹ to 3000 fb⁻¹. Various systematic uncertainty scenarios are explored. With (without) systematic uncertainties, the allowed 68% confidence interval for the $HHVV$ modifier κ2V is expected to be $[0.84,1.19]\;([0.86,1.17])$, while the 95% confidence interval is expected to be $[0.75, 1.27]\;([0.79, 1.23])$, for a 3000 fb⁻¹ data sample.