A brief Introduction to Dispersion Relations and Analyticity

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Abstract

In these lectures we provide a basic introduction into the topic of dispersion relation and analyticity. The properties of 2-point functions are discussed in some detail from the viewpoint of the K\"all\'en-Lehmann and general dispersion relations. The Weinberg sum rules figure as an application. The analytic structure of higher point functions in perturbation theory are analysed through the Landau equations and the Cutkosky rules.
Original languageUndefined/Unknown
Journal Journal of High Energy Physics
Publication statusPublished - 19 Oct 2016

Keywords

  • hep-ph
  • hep-th

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