What question did this study set out to answer?

This research aims to measure the inclusive, differential, and production-mode cross-sections of the Higgs boson in the four lepton decay channel.

May 28, 2026Open Access

Measurements of the Higgs boson production, fiducial and differential cross-sections in the four lepton decay channel using 164 fb^-1 of data collected at s = 13. 6 TeV with the ATLAS detector

Key Points

This research aims to measure the inclusive, differential, and production-mode cross-sections of the Higgs boson in the four lepton decay channel.
Utilized 164 fb$^{-1}$ of proton-proton collision data at $ ewlinesqrt{s}=13.6$ TeV from the ATLAS detector.
Measured fiducial cross-section and differential cross-sections based on kinematic observables.
Combined measurements across different production modes to assess overall signal strength.
Fiducial cross-section for $H \to ZZ^{*} \to 4\ell$ is $σ_{\textrm{fid}} = 3.65^{+0.35}_{-0.33}~\textrm{fb}$, consistent with SM prediction of $σ_{\textrm{fid}}^{\textrm{SM}} = 3.68 \pm 0.17~\textrm{fb}$.
Overall Higgs boson signal strength measured at $μ= 0.99 \pm 0.13$.
Results support Standard Model expectations regarding Higgs boson couplings and self-coupling.

Abstract

Inclusive, differential and production-mode cross-section measurements of the Higgs boson are performed in the H ZZ^* 4 decay channel. The analysis uses proton-proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of s=13. 6 TeV and recorded with the ATLAS detector, corresponding to an integrated luminosity of 164 fb^-1. The inclusive fiducial cross-section for the H ZZ^* 4 process is measured to be σ₅₈₃ = 3. 65^+0. 35-₀. ₃₃~fb, in agreement with the Standard Model prediction of σ₅₈₃^SM = 3. 68 0. 17~fb. Differential cross-sections are measured as a function of key kinematic observables of the Higgs boson and the four-lepton final state. Cross-sections are measured for the main production-modes in several exclusive regions of the Higgs boson production phase space and combined to measure an overall Higgs boson signal strength, defined as the measured cross-section normalised to the SM prediction, of μ= 0. 99 0. 13. The results are interpreted in terms of modifications of Higgs boson couplings using the κ framework, within the Standard Model Effective Field Theory, and in scenarios probing the Higgs boson self-coupling. All the results are consistent with Standard Model expectations.

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