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Spectral functions of confined particles

2019
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Physics Letters B
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We determine the gluon and ghost spectral functions along with the analytic structure of the associated propagators from numerical data describing gauge correlators at space-like momenta obtained by either solving the Dyson-Schwinger equations or through 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. Possible implications of the

doi:10.1016/j.physletb.2019.135171
fatcat:s2ix5cvs2vd4pkxaxph6cbrjby