Measuring the mass of the Higgs boson in the four-lepton final state with the ATLAS detector

We measure the mass of the Standard Model-like Higgs boson in the four-lepton decay channel using 140 fb$^{−1}$ of proton-proton collisions at the Large Hadron Collider at $\sqrt{s}$=13 TeV collected by the ATLAS detector. This corresponds to the full Run 2 dataset, spanning 2015-2018. For a Standard Model Higgs boson with $m_\mathrm{H}$ = 125 GeV, the expected statistical uncertainty is 177 MeV using a per-event strategy. The observed mass of the Higgs boson is 124.92 $\pm$ 0.19 (stat) $\pm$ 0.08 (sys) GeV with the same strategy.