AI Article Synopsis
- The text discusses how an l-loop Feynman integral can be expressed as a sum of phase space integrals linked to the spanning trees of the original loop graph.
- Causality constraints dictate that the propagators in these trees must use a modified iδ prescription.
- The authors provide a straightforward formula for determining the appropriate iδ prescription.
Article Abstract
We relate an l-loop Feynman integral to a sum of phase space integrals, where the integrands are determined by the spanning trees of the original l-loop graph. Causality requires that the propagators of the trees have a modified iδ prescription, and we present a simple formula for the correct iδ prescription.
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| http://dx.doi.org/10.1103/PhysRevLett.122.111603 | DOI Listing |
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