Measurement of cross sections and properties of the Higgs boson in decays to four leptons using the ATLAS detector

Abstract

The analysis of the production of the Higgs boson at CERN's Large Hadron Collider provides sensitivity to the couplings of the Higgs boson to Standard Model particles and to contributions from physics beyond the Standard Model of electroweak interactions. In this note the Higgs boson production is investigated in the $H\rightarrow ZZ \rightarrow 4l$ channel. A dataset of $79.8 fb^{-1}$ of 13 TeV $pp$ collision data was used to study the Higgs boson production cross section differential in the transverse momentum of the Higgs boson and the number of jets in the final state and to measure the Higgs boson production modes in the simplified templated cross section framework. All results are in agreement with the predictions of the Standard Model prediction. The measurement of the off-shell production of Higgs bosons is also found to be compatible with Standard Model prediction. An upper limit on the off-shell signal strength of $3.8$ and the natural width of the Higgs boson of $14.4$ MeV could be set at 95% confidence level with $36.1 fb^{-1}$ of $pp$ collision data.