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

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.

Comments: 10 pages, no figure, version accepted for publication in Phys. Lett. B