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\section{Introduction}
\label{sec:intro}
The recently discovered Higgs boson is measured so far by the CMS and ATLAS experiments to have properties compatible with the standard model predictions, as shown in Fig.~\ref{fig:ellis} from Ref.~\cite{cite:1303.3879}. Combined with the absence of any other discovery so far at the LHC,
be it either through precision measurements or via direct searches, this fundamental observation seems to push the energy scale of any physics beyond the standard model above several hundreds GeV. The higher-energy run, expected to start in 2015 at 13-14 TeV, will extend the sensitivity to new physics all the way to 1 TeV or more.
The existence of new phenomena, however, is a know fact: the observation of non-baryonic dark matter, the accelerating expansion of the universe, the baryon asymmetry, or the nonzero neutrino masses, are striking examples calling for physics beyond the standard model.
The existence of new phenomena, however, is a know fact: the observation of non-baryonic dark matter, the accelerating expansion of the universe, the baryon asymmetry, or the
nonzero neutrino masses, all call for physics beyond the standard model. As the pertaining energy scale is yet unknown, new colliders are in order to try to pin down their origin.
Explain that the present experimental and theoretical situation calls for precision measurements, both of the Higgs properties and of the EWSB parameters.
Show an historical perspective to help make the choice of the next collider. Mention the European Strategy.
State the precision needed for EWSB parameters and Higgs boson couplings.