Combined Measurement of the Higgs boson Mass from the H → γγ and H → ZZ^* →  4ℓ  Decay Channels with the ATLAS Detector Using √s = 7 , 8, and 13 TeV pp Collision Data

A measurement of the mass of the Higgs boson combining the H → ZZ^∗→4ℓ and H→γγ decay channels is presented. The result is based on 140 fb⁻¹ of proton-proton collision data collected by the ATLAS detector during LHC run 2 at a center-of-mass energy of 13 TeV combined with the run 1 ATLAS mass measurement, performed at center-of-mass energies of 7 and 8 TeV, yielding a Higgs boson mass of
125.11 ± 0.09 (stat)  ± 0.06 (syst) = 125.11 ± 0.11 GeV. This corresponds to a 0.09% precision achieved on this fundamental parameter of the Standard Model of particle physics.