Abstract

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H→γγ and H→ZZ→4ℓ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is m_{H}=125.09±0.21 (stat)±0.11 (syst) GeV.

Highlights

  • A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H → γγ and H → ZZ → 4l decay channels

  • In the standard model (SM), this symmetry breaking is achieved through the introduction of a complex doublet scalar field, leading to the prediction of the

  • Collaborations at the LHC announced the discovery of a particle with Higgs-boson-like properties and a mass of about 125 GeV [7,8,9]

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Summary

Despite the current agreement between the measured

Higgs boson properties and the SM predictions, it is pertinent to perform a mass measurement that is as independent as possible of SM assumptions. The individual signal strengths μγgγgFþttH, μγVγBFþVH, and μ4l are assumed to be the same for ATLAS and CMS, and are profiled in the combined fit for mH. Combining the ATLAS and CMS data for the H → γγ and H → ZZ → 4l channels according to the above procedure, the mass of the Higgs boson is determined to be mH 1⁄4 125.09 Æ 0.24 GeV. The statistical uncertainty is determined by fixing all nuisance parameters to their best-fit values, except for the three signal-strength scale factors and the H → γγ background function parameters, which are profiled. The second Asimov data set is a “postfit” sample, in which mH, the three signal strengths μγgγgFþttH, μγVγBFþVH, and μ4l, and all nuisance parameters are fixed to their best-fit estimates from the data.

Total Stat Syst
Total uncertainty Analysis weights
The compatibility of the signal strengths from
Observed Expected
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