Measurement of the Higgs boson mass in the $H\to Z{Z}^{\ast }\to 4\ell$ decay channel using 139 fb${}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collisions recorded by the ATLAS detector at the LHC

Abstract

The mass of the Higgs boson is measured in the $H\to Z{Z}^{\ast }\to 4\ell$ decay channel. The analysis uses proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector between 2015 and 2018, corresponding to an integrated luminosity of 139 fb${}^{-1}$. The measured value of the Higgs boson mass is $124.99\pm 0.18\text{(stat.)}\pm 0.04\text{(syst.)}$ GeV and is based on improved momentum-scale calibration for muons relative to previous publications. The measurement also employs an analytic model that takes into account the invariant-mass resolution of the four-lepton system on a per-event basis and the output of a deep neural network discriminating signal from background events. This measurement is combined with the corresponding measurement using 7 and 8 TeV $pp$ collision data, resulting in a Higgs boson mass measurement of $124.94\pm 0.17\text{(stat.)}\pm 0.03\text{(syst.)}$ GeV.

arXiv comment40 pages in total, author list starting at page 25, 9 figures, 2 tables, published by Physics Letters B All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2020-07/

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• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders