Patrick Janot edited 13311371474904756.tex  almost 11 years ago

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It is now generally agreed that very accurate measurements of the Z, W, top and Higgs properties (so-called EWSB parameters) will allow the sensitivity to new physics to be extended to higher energy scale. Typically, a new energy scale of 1 TeV would translate into deviations of the Higgs boson couplings to gauge bosons and fermions of up to 5\% with respect to the standard model predictions~\cite{cite:ILCTDR}, with a dependence inversely proportional to the square of the energy scale $\Lambda$:  \begin{equation}  {\delta g_{\rm HXX} \over g_{\rm HXX}} \le 5\% \times  \left({1 {\rm TeV} \over \Lambda}\right)^2 \end{equation}   The Higgs boson couplings therefore need to be measured with a per-cent accuracy or better to be sensitive to 1 TeV new physics, and with a per-mil accuracy to be sensitive to multi-TeV new physics. Similarly, the precision of the W and top mass measurements need to be reduced by at least one order of magnitude, and the precision of the Z pole measurements by two orders of magnitude to provide a meaningful closure test of the standard model, with sensitivity to multi-TeV weakly-coupled new physics.