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Abstract
In these proceedings we explore the use of (non-linear) electroweak chiral Lagrangians for the description of possible beyond the Standard Model strong dynamics in the electroweak sector. Experimentally one observes an approximate electroweak symmetry breaking pattern $SU(2)_L\times SU(2)_R/SU(2)_{L+R}$. Quantum Chromodynamics shows a similar chiral structure and, in spite of the differences (in the electroweak theory $SU(2)_L\times U(1)_Y$ is gauged), it has served for years as a guide for this type of studies. Examples of one-loop computations in the low-energy effective theory and the theory including the first vector and axial-vector resonances are provided, yielding, respectively, predictions for $\gamma\gamma\to Z_LZ_L,W^+_LW^-_L$ and the oblique parameters $S$ and $T$.
Highlights
A non-linear realization of the EW would-be Goldstone bosons (WBGBs) is considered to build the EW low-energy effective field theory (EFT), which is described by an EW chiral Lagrangian with a light Higgs (ECLh)
One can search for new physics by studying the one-loop corrections [5], which are sensitive to deviations from the Standard Model (SM) in the Higgs boson couplings
For the sake of completeness, we have added the running of the ECLh parameters ar4 and ar5, which has been recently determined in the one-loop analysis of WW–scattering within the framework of chiral Lagrangians [7]
Summary
A non-linear realization of the EW would-be Goldstone bosons (WBGBs) is considered to build the EW low-energy effective field theory (EFT), which is described by an EW chiral Lagrangian with a light Higgs (ECLh). It includes the Standard Model (SM) content: the EW Goldstones wa, the EW gauge bosons Wμa and Bμ and a singlet Higgs h (the fermion sector is not discussed here).
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