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arxiv: 1804.00945 · v3 · pith:MT7UANOBnew · submitted 2018-04-03 · ✦ hep-ph · hep-lat· hep-th

Reconstructing the gluon

classification ✦ hep-ph hep-lathep-th
keywords gluonfunctiongaugelandaupropagatorreconstructionspectralallows
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We reconstruct the gluon spectral function in Landau gauge QCD from numerical data for the gluon propagator. The reconstruction relies on two novel ingredients: Firstly we derive analytically the low frequency asymptotics of the spectral function. Secondly we construct a functional basis from a careful consideration of the analytic properties of the gluon propagator in Landau gauge. This allows us to reliably capture the non-perturbative regime of the gluon spectrum. We also compare different reconstruction methods and discuss the respective systematic errors.

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