Introduction
The electroweak fit has a long tradition in particle physics. The first fits were performed in 1990 and they have been used to confront measurements with theory predictions ever since. Two of the most important results of the electroweak fit have been the prediction of the mass of the top quark and the mass of the Higgs boson before their discovery. The figures below show the evolution of the indirect constraints of MH and mt over time.Summary Figures
In the figures below, we summarize the results from the Gfitter group, the LEP EW WG and the PDG of predictions for the masses of the top quark and the Higgs boson, and compare them to the direct measurements.
Prediction of the mass of the Higgs boson, as function of the year when it was derived. The bands show the 68% confidence level obtained by the LEP EW WG (light blue), the PDG (grey) and by the Gfitter group (dark blue). Also shown are fit results taking direct searches for the SM Higgs boson into account (green). The LHC measurements are shown as red dots. |
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Prediction of the mass of the top quark, as function of the year when it was derived. The blue and grey band show the 68% confidence level regions obtained by the LEP EW WG and the PDG, obtained by leaving MH free. The green band shows the results of the Gfitter group, obtained by including information on MH (direct searches before 2012, measurement afterwards). The measurements of mt by the Tevatron and LHC experiments are shown as orange and red dots, respectively, the combined LHC+Tevatron result is shown in black. |
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