Summary
It is shown that a special introduction of five-vectors to take care of mass terms appearing in traces associated with Feynman diagrams, leads to a considerable simplification of the trace calculation. This technique is particularly efficient in connection with double dispersion relations in electrodynamics, as is demonstrated in an example.
Riassunto
Si dimostra che una speciale introduzione di pentavettori per tener conto dei termini di massa che appaiono nelle tracce associate ai diagrammi di Feynman porta ad una considerevole semplificazione nel calcolo delle tracce. Questa tecnica è particolarmente efficiente in connessione con le relazioni di dispersione doppia in elettrodinamica, come si dimostra con un esempio.
Резюме
Показывается, что специальное введение пяти-векторов для учёта массовых членов, встречающихся в шпурах, связанных с диаграммами Фейнмана, приводит к значительному упрощению вычисления шпура. В частности, эта техника является эффективной в связи с двойными дисперсионными соотношениями в электродинамике, что иллюстрируется на примере.
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References
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Usually we haveb i=0 for all odd (or all even)i, and then the sign of the fifth component in (4) becomes equal for alli.
R. E. Cutkosky:Journ. Math. Phys.,1, 429 (1960).
S. Mandelstam:Phys. Rev.,115, 1741 (1959).
R. E. Cutkosky:Analytic properties of the S-matrix in perturbation theory. Nordita, Copenhagen, July 1962 (Lecture notes).
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Thörnblad, H. On the calculation of traces in connection with dispersion relations in electrodynamics. Nuovo Cimento A (1965-1970) 52, 161–172 (1967). https://doi.org/10.1007/BF02739281
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DOI: https://doi.org/10.1007/BF02739281