Disentangling a dynamical Higgs

作者：Brivio I^*; Corbett T; Eboli O J P; Gavela M B; Gonzalez Fraile J; Gonzalez Garcia M C; Merlo L; Rigolin S

来源：The Journal of High Energy Physics, 2014, 2014(3): 024.

DOI：10.1007/JHEP03(2014)024

• Higgs Physics
• Chiral Lagrangians
• Technicolor and Composite Models

The 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) x 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.

• 出版日期2014-3-5