CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2024-003
Title	Search for pair production of boosted Higgs bosons via vector-boson fusion production in the $b\bar{b}b\bar{b}$ final state using $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2024
Imprint	22 Mar 2024
Number of pages	mult.
Note	All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2024-003
In:	58th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 24 - 31 Mar 2024
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	HDBS, HH, 4b, k2V
Abstract	A search for Higgs boson ($H$) pair production via vector boson fusion (VBF) is performed in the Lorentz-boosted regime, where a Higgs boson candidate is reconstructed as a single large-radius jet, 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 is particularly sensitive to the quartic coupling between two vector bosons and two Higgs bosons relative to its Standard Model prediction, $\kappa_{2V}$. This study constrains $\kappa_{2V}$ to $0.55 < \kappa_{2V} < 1.49$ at 95% confidence level. 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.
Related document	superseded by: CERN-EP-2024-092

Corresponding record in: Inspire