Abstract
In the context of the minimal SO(5) linear σ-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 σ. Varying the σ 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. Furthermore, we derive the d ≤ 6 effective Lagrangian in the limit of heavy exotic fermions.
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Feruglio, F., Gavela, M.B., Kanshin, K. et al. The minimal linear σ model for the Goldstone Higgs. J. High Energ. Phys. 2016, 38 (2016). https://doi.org/10.1007/JHEP06(2016)038
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DOI: https://doi.org/10.1007/JHEP06(2016)038