Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-06-26
Phys.Rev.D78:065047,2008
Physics
High Energy Physics
High Energy Physics - Theory
38 pages, 9 figures, the content of section V has been extended and adapted
Scientific paper
10.1103/PhysRevD.78.065047
Recent lattice data have reported an infrared suppressed, positivity violating gluon propagator which is nonvanishing at zero momentum and a ghost propagator which is no longer enhanced. This paper discusses how to obtain analytical results which are in qualitative agreement with these lattice data within the Gribov-Zwanziger framework. This framework allows one to take into account effects related to the existence of gauge copies, by restricting the domain of integration in the path integral to the Gribov region. We elaborate to great extent on a previous short paper by presenting additional results, also confirmed by the numerical simulations. A detailed discussion on the soft breaking of the BRST symmetry arising in the Gribov-Zwanziger approach is provided.
Dudal David
Gracey John
Sorella Silvio Paolo
Vandersickel Nele
Verschelde Henri
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