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\section{\ref{sec:EWSB} Precise \section{Precise  Measurements of the EWSB parameters} \label{sec:EWSB}  Electroweak loops have the remarkable property of being sensitive to the existence of weakly-coupled particles, even if they cannot be directly produced or observed in current experiments. For example, the measurements of the Z resonance line-shape parameters, undertaken at LEP during a dedicated scan in 1993, led to a prediction of the top quark mass $m_{\rm top}$ of $172\pm 20$ GeV/$c^2$ by the time of the Moriond conference in March 1994~\cite{cite:Pietrzyk}. The uncertainty on $m_{\rm top}$ was dominated by the range of assumptions for the Higgs boson mass, varied from 60 to 1000 GeV/$c^2$. When the top quark was discovered at the Tevatron in 1995, and its mass measured with precision of a few GeV/$c^2$ within one standard deviation of the prediction, the Electroweak fits of the LEP data became sensitive to the only remaining unknown quantity in the Standard Model, the Higgs boson mass $m_{\rm H}$, predicted to be $m_{\rm H} = 99^{+28}_{-23}$ GeV/$c^2$~\cite{_Lys_Murayama_Wohl_et_al__2012}. It is remarkable that the observation of the H(126) particle at the LHC falls, once again, within one standard deviation of this prediction.