Abstract
For any Feynman amplitude, where any subset of invariants and/or squared masses is scaled by a real parameter λ going to zero or infinity, the existence of an expansion in powers of λ and lnλ is proved, and a method is given for determining such an expansion. This is shown quite generally in euclidean metric, whatever the external momenta (exceptional or not) and the internal masses (vanishing or not) may be, and for some simple cases in minkowskian metric, assuming only finiteness of the — eventually renormalized — amplitude before scaling. The method uses what is called “Multiple Mellin representation”, the validity of which is related to a “generalized power-counting” theorem.
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Communicated by R. Stora
On leave of absence from University of Bahia (Brazil). Fellow of CAPES, Brazil
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Bergère, M.C., de Calan, C. & Malbouisson, A.P.C. A theorem on asymptotic expansion of Feynman amplitudes. Commun. Math. Phys. 62, 137–158 (1978). https://doi.org/10.1007/BF01248668
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DOI: https://doi.org/10.1007/BF01248668