Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-02-07
Phys.Rev.D73:071502,2006
Physics
High Energy Physics
High Energy Physics - Lattice
6 pages, 6 figures and 3 tables; included some results on Gribov-copy effects; modified the introduction
Scientific paper
10.1103/PhysRevD.73.071502
We present a numerical study of the lattice Landau gluon and ghost propagators in three-dimensional pure SU(2) gauge theory. Data have been obtained using asymmetric lattices (V = 20^2 X 40, 20^2 X 60, 8^2 X 64, 8^2 X 140, 12^2 X 140 and 16^2 X 140) for the lattice coupling beta = 3.4, in the scaling region. We find that the gluon (respectively ghost) propagator is suppressed (respec. enhanced) at small momenta in the limit of large lattice volume V. By comparing these results with data obtained using symmetric lattices (V = 60^3 and 140^3), we find that both propagators suffer from systematic effects in the infrared region (p \lesssim 650 MeV). In particular, the gluon (respec. ghost) propagator is less IR-suppressed (respec. enhanced) than in the symmetric case. We discuss possible implications of the use of asymmetric lattices.
Cucchieri Attilio
Mendes Tereza
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