The electroweak S and T parameters from a fixed point condition

TL;DR

This paper investigates the renormalization group flow of electroweak parameters in a Higgsless standard model, showing that fixed point conditions can predict S parameter values consistent with experimental data.

Contribution

It introduces a fixed point approach to determine electroweak S and T parameters in a Higgsless model, linking high-energy behavior to low-energy observables.

Findings

S parameter fixed to experimental values at the fixed point

Low energy T remains arbitrary, to be measured experimentally

Model compatible with electroweak precision data

Abstract

We consider the standard model without the Higgs boson, where the Goldstone modes are described by a nonlinear sigma model. We study the renormalization group flow of the sigma model coupling f and of the electroweak parameters S and T. The condition that the couplings reach a fixed point at high energy leaves the low energy values of f and T arbitrary (to be determined experimentally) and fixes S to a value compatible with electroweak precision data.