S and T Parameters from a Light Nonstandard Higgs versus Near Conformal Dynamics

TL;DR

This paper analyzes how a light nonstandard Higgs, arising from near conformal dynamics, affects the electroweak S and T parameters, providing a clear separation of contributions and linking theory with experimental constraints.

Contribution

It introduces a formalism to precisely connect the intrinsic effects of near conformal dynamics on the Higgs sector with measurable electroweak parameters.

Findings

Quantifies the S and T parameter contributions from a nonstandard Higgs.

Separates Higgs sector effects from standard model interactions.

Links near conformal dynamics to observable electroweak parameters.

Abstract

We determine the contribution to the $S$ and $T$ parameters coming from extensions of the standard model featuring a light nonstandard-like Higgs particle. We neatly separate, using the Landau gauge, the contribution from the purely nonstandard Higgs sector, from the one due to the interplay of this sector with the standard model. If the nonstandard Higgs sector derives from a new type of near conformal dynamics, the formalism allows to precisely link the intrinsic underlying contribution with the experimentally relevant parameters.