Search for highly energetic Higgs pair production in the all-hadronic bbWW final state

We present a search for standard model (SM) nonresonant Higgs boson pair (HH) production is performed in the two bottom quark (bb) and all-hadronic two vector boson (VV→4q) final states. The search is carried out in proton-proton collisions at 13 TeV with a dataset corresponding to a total luminosity of 138 fb^-1. The analysis focuses on highly Lorentz-boosted HH candidates, where each Higgs boson's daughter quarks are all merged inside a single large radius jet. A new particle transformer (ParT) classifier is used to effectively perform boosted VV→4q jet identification. The multiplicative modifier of the SM quartic coupling between two Higgs bosons and two vector bosons (Kappa_2V) is observed (expected) to be constrained at 95% confidence level to [-0.04, 2.05] ([0.05, 1.98]).