The mass of the Higgs boson is measured in the 𝐻→𝛾𝛾 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 √𝑠=13TeV. The dataset was collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider, and corresponds to an integrated luminosity of 140fb−1. The measured value of the Higgs boson mass is 125.17 ±0.11(stat.)±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 8TeV 𝑝𝑝collision ATLAS data results in a Higgs boson mass measurement of 125.22 ±0.11(stat.)±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.

Aad, G., Abbott, B., Abeling, K., Abicht, N., Abidi, S., Aboulhorma, A., et al. (2023). Measurement of the Higgs boson mass with 𝐻→𝛾𝛾 decays in 140fb−1of √𝑠=13TeV 𝑝𝑝collisions with the ATLAS detector. PHYSICS LETTERS. SECTION B, 847, 138315-1-138315-23 [10.1016/j.physletb.2023.138315].

Measurement of the Higgs boson mass with 𝐻→𝛾𝛾 decays in 140fb−1of √𝑠=13TeV 𝑝𝑝collisions with the ATLAS detector

Alberghi, G. L.;Alfonsi, F.;Bindi, M.;Boscherini, D.;Carratta, G.;Cavalli, N.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Lasagni Manghi, F.;Massa, L.;Monzani, S.;