Measurement of the Higgs boson mass with $H\to \gamma \gamma$ decays in 140 fb${}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector

Abstract

The mass of the Higgs boson is measured in the $H\to \gamma \gamma$ decay channel, exploiting the high resolution of the invariant mass of photon pairs reconstructed from the decays of Higgs bosons produced in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=13$ TeV. The dataset was collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider, and corresponds to an integrated luminosity of 140 fb${}^{-1}$. The measured value of the Higgs boson mass is $125.17\pm 0.11(stat.)\pm 0.09(syst.)$ GeV and is based on an improved energy scale calibration for photons, whose impact on the measurement is about four times smaller than in the previous publication. A combination with the corresponding measurement using 7 and 8 TeV $pp$ collision ATLAS data results in a Higgs boson mass measurement of $125.22\pm 0.11(stat.)\pm 0.09(syst.)$ GeV. With an uncertainty of 1.1 per mille, this is currently the most precise measurement of the mass of the Higgs boson from a single decay channel.

arXiv comment36 pages in total, author list starting page 19, 3 figures, 2 tables, published in Phys. Lett. B. All figures and tables including auxiliary figures and tables are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2019-16/

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• Fate of the scalar quartic couplings in the inert models
• Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in $pp$ collisions at $\sqrt{s}=13$ TeV
• Rare Higgs Decay into a Photon and a Z Boson in Radiatively-Driven Natural Supersymmetry
• ParaFlow: fast calorimeter simulations parameterized in upstream material configurations