Features of the Refined Gribov-Zwanziger theory: propagators, BRST soft symmetry breaking and glueball masses

Understand

The present work discusses an approach to access the physical spectrum of the Yang-Mills theory quantized in the Landau gauge.

• By using recent lattice data on the gluon propagator, it is possible to study the two-point functions of gauge invariant composite operators, from which masses of glueballs can be extracted.
• It turns out that the momentum dependence of the gluon propagator is very well reproduced by the corresponding tree-level gluon propagator obtained from the Refined Gribov-Zwanziger theory, which takes into account the presence of the Gribov horizon as well as the effect of condensates of mass dimension two.
• The resulting glueball masses are in good agreement with the available lattice data