Electroweak chiral Lagrangians and the Higgs properties at the one-loop level

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 $\gamma \gamma \to Z_L{Z}_L,W_L^{+}{W}_L^{-}$ and the oblique parameters $S$ and $T$.

Comments: 6 pages, 2 eps figures. Proceedings of the 7th Edition of the International Workshop on Quantum Chromodynamics -QCD@Work: Interantional Workshop on QCD, Theory and Experiment- (16-19 June 2014, Giovinazzo, Italy)