The minimal linear sigma model for the Goldstone Higgs

Understand

In the context of the minimal SO(5) linear {\sigma}-model, a complete renormalizable Lagrangian -including gauge bosons and fermions- is considered, with the symmetry softly broken to SO(4).

• The scalar sector describes both the electroweak Higgs doublet and the singlet {\sigma}.
• Varying the {\sigma} mass would allow to sweep from the regime of perturbative ultraviolet completion to the non-linear one assumed in models in which the Higgs particle is a low-energy remnant of some strong dynamics.
• We analyze the phenomenological implications and constraints from precision observables and LHC data.