High Energy Physics - Lattice
[Submitted on 14 Nov 2013]
Title:Spectral densities from the lattice
View PDFAbstract:We discuss a method to extract the Källén-Lehmann spectral density of a particle (be it elementary or bound state) propagator by means of 4d lattice data. We employ a linear regularization strategy, commonly known as the Tikhonov method with Morozov discrepancy principle. An important virtue over the popular maximum entropy method is the possibility to also probe unphysical spectral densities, as, for example, of a confined gluon. We apply our proposal to the SU(3) glue sector.
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