Patrick Janot edited Global EWSB Fit.tex  over 10 years ago

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\subsection{Global fit of the EWSB parameters}  Once the Higgs boson mass is measured and the top quark mass determined with a precision of a few tens of MeV, the Standard Model prediction of a number of observables sensitive to electroweak radiative corrections will become absolute with no remaining additional parameters. Any deviation will be demonstration of the existence of new, weakly interacting particle(s). As was seen in the previous chapters, TLEP will offer the opportunity of measurements of such quantities with precisions between one and two orders of magnitude better than the present status of these measurements. The theoretical prediction of these quantities with a matching precision will be a real challenge, but the ability of these tests of the completeness of the standard model to discover the existence of new weakly-interacting particles beyond those already known is real. As an illustration, the results of the fit of all the Electroweak measurements foreseen with TLEP-Z, as obtained with the Gfitter program~\cite{GFitter} in the Standard Model, is displayed in Fig.~\ref{fig:GFitter1} and compared to the direct $m_{\rm W}$ and $m_{\top}$ measurements from TLEP-W and TLEP-t on the one hand, and from the current Tevatron data, as well as the LHC and ILC projections, on the other. Figure~\ref{fig:GFitter2} shows the fit of the Higgs boson mass, obtained from GFitter, expected from all the TLEP Electroweak precision measurements. A precision of $\pm 0.9$~GeV/$c^2$ on $m_{\rm H}$ is predicted if all related theory uncertainties can be reduced by one order of magnitude with respect to their current values.