CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2025-104
Title	Recent measurements from the ATLAS experiment of Multi-Boson production processes at the LHC
Author(s)	Baron, Diego (The University of Manchester (GB)) (+)
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2025
Imprint	07 Nov 2025
Number of pages	10
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	Multiboson ; Electroweak ; EWEAK
Abstract	The high-energy proton-proton collisions at the Large Hadron Collider provide the ideal conditions to study the rarest process predicted by the Standard Model (SM) such as the production of multiple electroweak bosons. These processes involve the self-interactions of the gauge bosons through triple and quartic gauge couplings (TGCs and QGCs), in addition to interactions with the Higgs boson. Therefore, precision measurements of multi-boson final states probe the electroweak symmetry breaking mechanism and allow to search for deviations from the SM. Four recently published ATLAS results are summarised in this paper. The first two results are measurements of the production of di-boson final states in association with jets: the observation of $WW/WZ/ZZ$ production in semileptonic final states is described, and a measurement of the polarisation states of same-sign $W$ pairs is also discussed. The second set of measurements are related to the triple production of electroweak bosons: the first analysis reports the observation of $WW\gamma$ in the leptonic final state, while the second result presents the observation of triple vector boson production where at least one of the produced bosons is a $Z$ boson. All the measurements use datasets collected at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 140 fb$^{-1}$.
Copyright/License	preprint: © 2025-2026 CERN (License: CC-BY-4.0)