Renormalizability of a quark-gluon model with soft BRST breaking in the infrared region

TL;DR

This paper proves the all-order renormalizability of a quark-gluon model with soft BRST symmetry breaking, explaining modifications in quark and gluon correlations at large distances.

Contribution

It demonstrates the renormalizability of a modified quark-gluon model with soft BRST breaking using softly broken Ward identities.

Findings

Renormalizability established to all perturbation orders.

Modified correlation functions at large distances.

Use of softly broken Ward identities for proof.

Abstract

We prove the renormalizability of a quark-gluon model with a soft breaking of the BRST symmetry, which accounts for the modification of the large distance behavior of the quark and gluon correlation functions. The proof is valid to all orders of perturbation theory, by making use of softly broken Ward identities.