Analytic properties of the Landau gauge gluon and quark propagators

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dc.creatorAlkofer, R.
dc.creatorDetmold, W.
dc.creatorFischer, C. S.
dc.creatorMaris, P.
dc.date2003-09-08
dc.date2004-06-23
dc.date.accessioned2026-07-07T11:09:26Z
dc.date.available2026-07-07T11:09:26Z
dc.descriptionWe explore the analytic structure of the gluon and quark propagators of Landau gauge QCD from numerical solutions of the coupled system of renormalized Dyson--Schwinger equations and from fits to lattice data. We find sizable negative norm contributions in the transverse gluon propagator indicating the absence of the transverse gluon from the physical spectrum. A simple analytic structure for the gluon propagator is proposed. For the quark propagator we find evidence for a mass-like singularity on the real timelike momentum axis, with a mass of 350 to 500 MeV. Within the employed Green's functions approach we identify a crucial term in the quark-gluon vertex that leads to a positive definite Schwinger function for the quark propagator.
dc.description42 pages, 16 figures, revtex; version to be published in Phys Rev D
dc.identifierhttps://arxiv.org/abs/hep-ph/0309077
dc.identifierhttp://arxiv.org/abs/hep-ph/0309077
dc.identifierPhys.Rev.D70:014014,2004
dc.identifierdoi:10.1103/PhysRevD.70.014014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190466
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.titleAnalytic properties of the Landau gauge gluon and quark propagators
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