ON COMPOSITE FIELDS APPROACH TO GRIBOV COPIES ELIMINATION IN YANG-MILLS THEORIES

摘要

We suggest a way of introduction of the Gribov-Zwanziger horizon functional Η for Yang-Mills theories by means of composite fields technique, as σ(ф) = Η. A different form of the same horizon functional in gauges χ and χ' is taken into account via (gauged) field-dependent BRST transformations connecting quantum Yang-Mills actions in these gauges. We introduce generating functionals of Green's functions with composite fields and derive the corresponding Ward identities. A study of gauge dependence shows that the effective action in Yang-Mills theories with the composite field Η does not depend on the gauge on the extremals determined by the Yang-Mills fields ф alone.