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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Electroweak S and T parameters from a fixed point condition.

M Fabbrichesi¹, R Percacci, A Tonero

¹INFN, Sezione di Trieste, Trieste, Italy.

Physical Review Letters

|July 30, 2011

Summary

This summary is machine-generated.

We analyzed the standard model without the Higgs boson using a nonlinear sigma model. Our findings show electroweak parameter S is fixed, while f and T remain experimentally determined.

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Area of Science:

High Energy Physics
Quantum Field Theory
Particle Physics

Background:

The Standard Model (SM) describes fundamental particles and forces.
The Higgs boson mechanism explains electroweak symmetry breaking.
Nonlinear sigma models are used to describe Goldstone modes.

Purpose of the Study:

Investigate the renormalization group flow of a Higgs-less SM.
Analyze the behavior of sigma model coupling and electroweak parameters (S and T).
Determine constraints on these parameters from high-energy fixed points.

Main Methods:

Utilized a nonlinear sigma model to represent Goldstone modes.
Studied the renormalization group flow of the sigma model coupling (f).
Examined the renormalization group flow of electroweak parameters S and T.

Main Results:

The condition for couplings to reach a high-energy fixed point was applied.
Low-energy values of coupling f and parameter T were found to be arbitrary.
Parameter S was fixed to a value consistent with electroweak precision data.

Conclusions:

The Higgs-less SM with a nonlinear sigma model provides a consistent framework.
Electroweak parameter S is constrained by high-energy physics.
Experimental determination is required for parameters f and T.