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 $$ \sqrt{s}=13.6 $$ TeV with the ATLAS detector

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 $$ \sqrt{s}=13.6 $$ 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 $$ {\sigma}_{\mathrm{fid}}={3.65}_{-0.33}^{+0.35} $$ σ fid = 3.65 − 0.33 + 0.35 fb, in agreement with the Standard Model prediction of $$ {\sigma}_{\mathrm{fid}}^{\mathrm{SM}}=3.68\pm 0.17 $$ 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.