Anomalous Higgs couplings in composite models at the LHC and beyond (TOPICAL SEMINAR)

by Dr Andrea Thamm (EPFL)

Thursday 28 Nov 2013, 11:00 → 12:00 Europe/Brussels

1G003 (IIHE)

I will discuss the impact of Higgs precision measurements on the parameter space of a strongly interacting Higgs boson. Some combination of anomalous couplings are already tightly constrained by current fits to electroweak observables. However, even small deviations in the cross sections of single and double Higgs production, or the mere detection of a triple Higgs final state, can help establish whether it is a composite state and whether or not it emerges as a pseudo-Nambu-Goldstone boson from an underlying broken symmetry. A high-energy and high-luminosity linear collider provides a particularly clean environment to observe WW scattering and hh production. From a study of these processes, we obtain an estimate of the ILC and CLIC sensitivities on the anomalous Higgs couplings and the compositeness scale $4\pi f$. I will summarize the current experimental constraints, from electroweak data and direct resonance searches, and the expected reach of the LHC and CLIC on $v^2/f^2$ and on the scale of the new resonances.