Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-04-26
Phys.Rev.D81:016005,2010
Physics
High Energy Physics
High Energy Physics - Lattice
17 pages, 11 tables, 18 figures; 5 figures and various references added; main modifications in Sections I, I.E, II.A, II.C.5 a
Scientific paper
10.1103/PhysRevD.81.016005
We study Landau-gauge gluon and ghost propagators in Yang-Mills theories at lattice parameter beta = 0, considering relatively large lattice volumes for the case of the SU(2) gauge group in three and four space-time dimensions. We compare the lattice data to the so-called massive and conformal-scaling solutions, examining the requirements for a good description of the propagators over various ranges of momenta and discussing possible systematic errors. Our analysis strongly supports the massive solution, i.e. a finite gluon propagator and an essentially free ghost propagator in the infrared limit, in disagreement with Ref. [1]. Moreover, we argue that discretization effects play no role in the analysis of these propagators.
Cucchieri Attilio
Mendes Tereza
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