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
Summary
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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