Summary
The hierarchical principle is discussed in perturbation theory in the light of the fact that Cutkosky integrals can have lower-order singularities corresponding to contracting out complete closed loops. It is shown that a strict hierarchical principle can be defined for Feynman integrals in theα-representation but that due to a hitherto overlooked mechanism identically located singularities occur at different levels in the hierarchy. The discussion is illustrated throughout by reference to the icecream-cone diagram.
Riassunto
Si discute il principio gerarchico nella teoria delle perturbazioni alla luce del fatto che gli integrali di Cutkosky possono avere singolarità di ordine inferiore che corrispondono a contrazioni di nodi chiusi. Si dimostra che si può definire uno stretto principio gerarchico per gli integrali di Feynman nella rappresentazioneα, ma che a causa di un meccanismo sinora trascurato le singolarità si verificano a differenti livelli nella gerarchia. Si illustra dappertutto la discussione facendo riferimento al diagramma a cono gelato.
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The research reported in this document has been sponsored in part by the Air Force Office of Scientific Research, OAR, under Grant AF EOAR 63-79 with the European Office of Aerospace Research, United States Air Force.
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Landshoff, P.V., Olive, D.I. & Polkinghorne, J.C. The hierarchical principle in perturbation theory. Nuovo Cimento A (1965-1970) 43, 444–453 (1966). https://doi.org/10.1007/BF02752870
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DOI: https://doi.org/10.1007/BF02752870