1.
Phys Rev Lett
; 123(5): 059902, 2019 Aug 02.
Artículo
en Inglés
| MEDLINE
| ID: mdl-31491326
RESUMEN
This corrects the article DOI: 10.1103/PhysRevLett.122.111603.
2.
Phys Rev Lett
; 122(11): 111603, 2019 Mar 22.
Artículo
en Inglés
| MEDLINE
| ID: mdl-30951325
RESUMEN
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.