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Composite Higgs models are an attractive scenario, where the discovered Higgsboson is regarded as a Nambu-Goldstone boson associated with spontaneousbreakdown of a global symmetry of more fundamental theory. This class of modelspredicts violation of perturbative unitarity at high energies, and newresonances are expected to appear around TeV scale to maintain the unitarity,while a sizable phase shift is predicted in certain scattering amplitude. Weinvestigate the new resonance scale from the phase shift by drawing analogieswith pion physics in QCD. The detectability of the phase shift at LHC and theILC is also discussed. This talk was given in {\it HPNP 2015} at University ofToyama and based on the work in collaboration with S.~Kanemura, T.~Shindou andN.~Machida (arXiv:1410.8413 [hep-ph]).

Probing composite Higgs models by measuring phase shifts at LHC