CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2025-100
Title	Non-resonant Higgs Pair Production and Higgs-self couplings limits by ATLAS
Author(s)	Falda Coelho, Luis (Brandeis University (US))
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2025
Imprint	04 Nov 2025
Number of pages	8
In:	The 32nd International Symposium on Lepton Photon Interactions at High Energies (Lepton Photon 2025), Madison, Wisconsin, Us, 25 - 29 Aug 2025
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Higgs Pairs ; di-Higgs ; HH ; bbyy ; HIGGS
Abstract	In the Standard Model (SM), the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The SM makes a definite prediction for the Higgs boson self- coupling and thereby the shape of the Higgs potential. Experimentally, both can be probed through the production of Higgs boson pairs (HH), a rare process that presently receives a lot of attention at the LHC. In this note, the latest HH searches by the ATLAS experiment are reported. Non- resonant HH search results are interpreted both in terms of sensitivity to the SM and as limits on the Higgs boson self-coupling and the quartic VVHH coupling. Additionally, extrapolations of recent HH results towards the High-Luminosity LHC upgrade are also discussed.
Copyright/License	preprint: © 2025-2026 CERN (License: CC-BY-4.0)

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