Squeezed gluon vacuum and the global colour model of QCD

TL;DR

This paper explores how a squeezed gluon vacuum model can explain the infrared behavior of the gluon propagator and connect the confining interaction strength with the gluon condensate in QCD.

Contribution

It demonstrates that the squeezed gluon vacuum model can account for the infrared singular gluon propagator used in the global colour model and links it to physical gluon condensate values.

Findings

Reproduces a QCD-motivated model with a dynamical gluon mass

Connects the confining interaction strength to the gluon condensate

Shows the vacuum model explains infrared singularities in gluon propagators

Abstract

We discuss how the vacuum model of Celenza and Shakin with a squeezed gluon condensate can explain the existence of an infrared singular gluon propagator frequently used in calculations within the global colour model. In particular, it reproduces a recently proposed QCD-motivated model where low energy chiral parameters were computed as a function of a dynamically generated gluon mass. We show how the strength of the confining interaction of this gluon propagator and the value of the physical gluon condensate may be connected.