Abstract

The mass of the Higgs boson is measured in the H→ZZ⁎→4ℓ and in the H→γγ decay channels with 36.1 fb−1 of proton–proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector in 2015 and 2016. The measured value in the H→ZZ⁎→4ℓ channel is mHZZ⁎=124.79±0.37GeV, while the measured value in the H→γγ channel is mHγγ=124.93±0.40GeV. Combining these results with the ATLAS measurement based on 7 and 8 TeV proton–proton collision data yields a Higgs boson mass of mH=124.97±0.24GeV.

Highlights

  • The observation of a Higgs boson, H, by the ATLAS and CMS experiments [1,2] with the Large Hadron Collider (LHC) Run 1 proton-proton collision data at centre-of-mass energies of Ys = 7 and 8 TeV was a major step towards understanding the mechanism of electroweak (EW) symmetry breaking [3,4,5]

  • The estimate of mH for the per-event and template methods is extracted with a simultaneous profile likelihood fit to the six­ teen categories

  • The free parameters of the fit are mH, the four signal strengths, the number of background events and the parameters describing the shape of the background invariant mass distribu­ tion in each category, and all the nuisance parameters associated with systematic uncertainties

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Summary

Introduction

The observation of a Higgs boson, H, by the ATLAS and CMS experiments [1,2] with the Large Hadron Collider (LHC) Run 1 proton-proton (pp) collision data at centre-of-mass energies of Ys = 7 and 8 TeV was a major step towards understanding the mechanism of electroweak (EW) symmetry breaking [3,4,5]. The mass of the Higgs boson was measured to be 125.09±0.24 GeV [6] based on the combined Run 1 data samples of the ATLAS and CMS Collaborations, who reported individual mass measurements in Refs. The CMS Collaboration measured the Higgs boson mass in the H ZZ* 4T channel using 35.9 fb-1 of 13 TeV pp collision data [9]. This Letter presents a measurement of the Higgs boson mass, mH, with 36.1 fb-1 of Ys = 13 TeV pp collision data recorded with the ATLAS detector. Events with invariant mass of the leading and subleading photon in the range 105 GeV < myy < 160 GeV are kept

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