Search for pair production of boosted Higgs bosons via vector-boson fusion in the $b\bar{b}b\bar{b}$ final state using $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
Aad, Georges , Aakvaag, Erlend , Abbott, Braden Keim , Abdelhameed, Sara , Abeling, Kira , Abicht, Nils Julius , Abidi, Haider , Aboelela, Mohammed , Aboulhorma, Asmaa , Abramowicz, Halina
Phys.Lett.B 858 (2024) 139007, 2024.

Abstract (data abstract)
Search for pair production of boosted Higgs bosons in the $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector A search for Higgs boson ($H$) pair production via vector boson fusion (VBF) is performed in the Lorentz-boosted regime using 140 fb$^{-1}$ of proton-proton collision data at 13 TeV recorded by the ATLAS detector. Only Higgs boson decays to bottom quark pairs are considered. The search constrains the quartic coupling between two vector bosons and two Higgs bosons relative to its Standard Model prediction, $\kappa_{2V}$, to $0.6 < \kappa_{2V} < 1.5$ at 95% confidence level, when combining with the equivalent resolved analysis. The value $\kappa_{2V} = 0$ is excluded with a significance of $3.8 \sigma$ with other $H$ couplings fixed to their SM values. A search for new heavy spin-0 resonances that would mediate VBF Higgs pair production is carried out in the mass range of 1-5TeV for the first time under multiple model and decay-width assumptions. No significant deviations from the SM hypotheses are observed and exclusion limits at 95% confidence level are derived.

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