Abstract
The Higgs boson with a mass MH≈126 GeV has been observed by the ATLAS and CMS experiments at the LHC and a total significance of about five standard deviations has been reported by both collaborations when the channels H→γγ and H→ZZ→4ℓ are combined. Nevertheless, while the rates in the later search channel appear to be in accord with those predicted in the Standard Model, there seems to be an excess of data in the case of the H→γγ discovery channel. Before invoking new physics contributions to explain this excess in the di-photon Higgs rate, one should verify that standard QCD effects cannot account for it. We describe how the theoretical uncertainties in the Higgs boson cross section for the main production process at the LHC, gg→H, which are known to be large, should be incorporated in practice. We further show that the discrepancy between the theoretical prediction and the measured value of the gg→H→γγ rate, reduces to about one standard deviation when the QCD uncertainties are taken into account.
Highlights
The Higgs boson with a mass MH ≈ 126 GeV has been observed by the ATLAS and CMS experiments at the LHC and a total significance of about five standard deviations has been reported by both collaborations when the channels H → γγ and H → ZZ → 4l are combined
While the rates in the later search channel appear to be in accord with those predicted in the Standard Model, there seems to be an excess of data in the case of the H → γγ discovery channel
We further show that the discrepancy between the theoretical prediction and the measured value of the gg → H → γγ rate, reduces to about one standard deviation when the QCD uncertainties are taken into account
Summary
The Higgs particle [1] has been, at last, observed by the ATLAS and CMS experiments at the LHC as a signal with about five standard deviations has been reported by each collaboration when the main search channels are combined [2]. Abstract The Higgs boson with a mass MH ≈ 126 GeV has been observed by the ATLAS and CMS experiments at the LHC and a total significance of about five standard deviations has been reported by both collaborations when the channels H → γγ and H → ZZ → 4l are combined.
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