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Disentangling a dynamical Higgs

AuthorsBrivio, I.; Corbett, T.; Eboli, O. J. P.; Gavela, Mª Belén CSIC; González-Fraile, J.; González-García, M. C.; Merlo, Luca CSIC ORCID CVN; Rigolin, Stefano CSIC ORCID
Issue Date5-Mar-2014
CitationJournal of High Energy Physics 2014: 24 (2014)
AbstractThe pattern of deviations from Standard Model predictions and couplings is different for theories of new physics based on a non-linear realization of the SU(2)L × U(1)Y gauge symmetry breaking and those assuming a linear realization. We clarify this issue in a model-independent way via its effective Lagrangian formulation in the presence of a light Higgs particle, up to first order in the expansions: dimension-six operators for the linear expansion and four derivatives for the non-linear one. Complete sets of gauge and gauge-Higgs operators are considered, implementing the renormalization procedure and deriving the Feynman rules for the non-linear expansion. We establish the theoretical relation and the differences in physics impact between the two expansions. Promising discriminating signals include the decorrelation in the non-linear case of signals correlated in the linear one: some pure gauge versus gauge-Higgs couplings and also between couplings with the same number of Higgs legs. Furthermore, anomalous signals expected at first order in the non-linear realization may appear only at higher orders of the linear one, and vice versa. We analyze in detail the impact of both type of discriminating signals on LHC physics.
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