Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-09-18
Eur.Phys.J.A31:790-792,2007
Physics
High Energy Physics
High Energy Physics - Lattice
Talk given at QNP06; final version with improved english, accepted for publication at EPJA
Scientific paper
10.1140/epja/i2006-10210-x
We report on the infrared limit of the quenched lattice Landau gauge gluon and ghost propagators as well as the strong coupling constant computed from large asymmetric lattices. The infrared lattice propagators are compared with the pure power law solutions from Dyson-Schwinger equations (DSE). For the gluon propagator, the lattice data is compatible with the DSE solution. The preferred measured gluon exponent being $\sim 0.52$, favouring a null zero momentum propagator. The lattice ghost propagator shows finite volume effects and, for the volumes considered, the propagator does not follow a pure power law. Furthermore, the strong coupling constant is computed and its infrared behaviour investigated.
Oliveira Orlando
Silva Pedro J.
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