%0 Journal Article
%T Viability of Strongly Coupled Scenarios with a Light Higgs-like Boson
%A Pich, A.
%A Rosell, I.
%A Sanz-Cillero, J. J.
%J Physical Review Letters
%D 2013
%V 110
%N 18
%I Amer Physical Soc
%@ 0031-9007
%G English
%F Pich_etal2013
%O WOS:000319020100002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1456), last updated on Fri, 28 Jun 2013 15:48:14 +0000
%X We present a one-loop calculation of the oblique S and T parameters within strongly coupled models of electroweak symmetry breaking with a light Higgs-like boson. We use a general effective Lagrangian, implementing the chiral symmetry breaking SU(2)(L) circle times SU(2)(R) -> SU(2)(L+R) with Goldstone bosons, gauge bosons, the Higgs-like scalar, and one multiplet of vector and axial-vector massive resonance states. Using a dispersive representation and imposing a proper ultraviolet behavior, we obtain S and T at the next-to-leading order in terms of a few resonance parameters. The experimentally allowed range forces the vector and axial-vector states to be heavy, with masses above the TeV scale, and suggests that the Higgs-like scalar should have a WW coupling close to the standard model one. Our conclusions are generic and apply to more specific scenarios such as the minimal SO(5)/SO(4) composite Higgs model.
%R 10.1103/PhysRevLett.110.181801
%U http://arxiv.org/abs/1212.6769
%U https://doi.org/10.1103/PhysRevLett.110.181801
%P 181801-4pp