Abstract
A
bstract
Inclusive, differential and production-mode cross-section measurements of the Higgs boson are performed in the
H
→
ZZ
*
→ 4
ℓ
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
ℓ
process is measured to be
σ
fid
=
3.65
−
0.33
+
0.35
fb, in agreement with the Standard Model prediction of
σ
fid
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.