Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-12-07
PoS QCD-TNT09:003,2009
Physics
High Energy Physics
High Energy Physics - Lattice
12 pages, 18 figures; talk presented at QCD-TNT, Trento, 7-11 sep 2009
Scientific paper
In lattice QCD, a confining potential for a static quark-antiquark pair can be computed with the Wilson loop technique. This potential, dominated by a linear potential at moderate distances, is consistent with the confinement with a flux tube, an extended and scalar system also directly observable in lattice QCD. Quantized flux tubes have also been observed in another class of confinement, the magnetic confinement in type II superconductors. On the other hand the solution of Schwinger Dyson Equations, say with the Landau gauge fixing and the truncation of the series of Feynman diagrams, already at the rainbow level for the self energy and at the ladder level for the Bethe Salpeter equation, provides a signal of a possible inverse quartic potential in momentum space derived from one gluon and one ghost exchange, consistent with confinement. Here we address the successes, difficulties and open problems of the matching of these two different perspectives of confinement, the Schwinger-Dyson perspective versus the flux tube perspective.
Bicudo Pedro
Cardoso Marco
Cardoso Nuno
Marques Gonçalo
Oliveira Orlando
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