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Spectral functions of confined particles

Daniele Binosi, Ralf-Arno Tripolt
We determine the gluon and ghost spectral functions along with the analytic structure of the associated propagators from numerical data describing Landau gauge correlators at space-like momenta obtained by either solving the Dyson-Schwinger equations or through (quenched) lattice simulations. Our novel reconstruction technique shows the expected branch cut for the gluon and the ghost propagator, which, in the gluon case, is supplemented with a pair of complex conjugate poles. The possible implications of the existence of these poles are briefly addressed.