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Related Experiment Video

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Parity doubling and the S parameter below the conformal window.

T Appelquist¹, R Babich, R C Brower

¹Department of Physics, Sloane Laboratory, Yale University, New Haven, Connecticut 06520, USA.

Physical Review Letters

|July 21, 2011

Summary

This study simulates SU(3) gauge theories with varying fermion numbers. Increasing fermion numbers shifts the spectrum towards parity doubling and decreases the electroweak S parameter, suggesting a move toward infrared conformality.

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Area of Science:

High Energy Physics
Quantum Chromodynamics
Lattice Gauge Theory

Background:

Understanding the behavior of Quantum Chromodynamics (QCD) with varying numbers of fermion flavors is crucial for exploring the transition from confinement to conformality.
The electroweak S parameter is a key observable in probing physics beyond the Standard Model.

Purpose of the Study:

To perform lattice simulations of SU(3) gauge theories with N(f)=2 and N(f)=6 flavors.
To investigate the masses and decay constants of vector and axial resonances.
To calculate the electroweak S parameter and analyze its dependence on the number of fermion flavors.

Main Methods:

Lattice simulations of SU(3) gauge theory.
Calculation of hadron spectrum (masses and decay constants).
Determination of the electroweak S parameter.

Main Results:

The spectrum exhibits increased parity doubling as N(f) increases from 2 to 6.
The electroweak S parameter per electroweak doublet decreases with increasing N(f).

Conclusions:

The observed trends suggest that increasing fermion flavors drives the system towards infrared conformality.
Further studies with even more fermion flavors are motivated to explore this transition region.