Eur. Phys. J. A (2007) 31: 790-792
https://doi.org/10.1140/epja/i2006-10210-x

QNP 2006

Infrared gluon and ghost propagators from lattice QCD

Results from large asymmetric lattices

Centro de Fısica Computacional, Universidade de Coimbra, 3004 516, Coimbra, Portugal

^* e-mail: orland@teor.fis.uc.pt

Received: 25 October 2006
Accepted: 1 November 2006
Published online: 1 March 2007

Abstract

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 ∼0.52, favouring a vanishing propagator at zero momentum. 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.