A physical meaning of mixed gluon--ghost condensate of mass dimension two

TL;DR

This paper clarifies the physical significance of the on-shell BRST-invariant mixed gluon--ghost condensate of mass dimension two, linking it to gauge-invariant observables and emphasizing its relevance in quantum gauge theories.

Contribution

It provides a physical interpretation of the mixed gluon--ghost condensate, establishing its connection to gauge invariance and observable quantities.

Findings

The mixed condensate has a clear physical meaning.

It is associated with gauge-invariant observables.

The condensate's relevance to quantum gauge theories is demonstrated.

Abstract

We demonstrate that a clear physical content and relevance can be attributed to the on-shell BRST-invariant mixed gluon--ghost condensate of mass dimension two which was recently proposed by the author. We argue that a gauge invariant observable is associated with the mixed condensate.