Summary
Fubini-type identities are studied in the Feynman-diagram model of relativitic quantum mechanics using Ward-identity type arguments. Covariant relations with no Schwinger-term contributions are found for currents constructed from Fermi fields, but covariant Schwinger terms are in general present if Bose fields are used to construct the currents. Finally the PCAC assumption is discussed.
Riassunto
Usando argomenti del tipo dell'identità di Ward si studiano le identità del tipo di Fubini nel modello dei diagrammi di Feynman della meccanica quantistica relativistica. Per correnti derivate da campi di Fermi si trovano relazioni covarianti senza contributi del termine di Schwinger, mentre termini di Schwinger covarianti sono in generale persenti se si usano campi di Bose per otten ere le correnti. Si discute infine l'ipotesi di PCAC.
Резюме
Исследуются тождества типа Фубини в модели диаграмм Фейнмана для релятивистской квантовой механики, используя аргументы типа тождества Уорда. Не обнаружено ковариантных соотношений с вкладами швинтеровских членов для токов, сконструированных из полей Ферми, но, вообще, ковариантные швинтеровские члены, присутствующие для полей Бозе, используются для конструирования токов. В заключение обсуждается гипотеза частичного сохранения аксиального тока.
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References
S. Fubini:Nuovo Cimento,43, 475 (1966).
A different approach also emphasising the Ward identity element has been given byK. Raman andE. G. R. Sudarshan:Phys. Rev.,154, 1499 (1967). There are also obvious connections with the gauge variance ideas discussed byM. Veltmann:Phys. Rev. Lett.,17, 553 (1966);J. S. Bell:Nuovo Cimento,50, 129 (1967).
K. Johnson andF. E. Low:Suppl Progr. Theor. Phys.,37,38, 74 (1966).
B. Hamprecht:Nuovo Cimento,47 A, 770 (1967);J. C. Polkinghorne:Nuovo Cimento 52 A, 351, (1967).
An example has been given byP. Osborne: Cambridge preprint (July 1967).Weinberg sum rules in a Perturbation Theory model to be published inNuovo Cimento.
T. D. Lee, S. Weinberg andB. Zumino:Phys. Rev. Lett.,18, 1029 (1967).
I. G. Halliday, P. V. Landshoff andJ. C. Polkinghorne: Cambridge preprint,PCAC, PDAAC and the Adler-Weisberger Relation (June 1967).
M. Gell-Mann andM. Levy:Nuovo Cimento,16, 705 (1960).
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The research reported in this document has been sponsored in part by the Air Force Office of Scientific Research under Grant AF EOAR 65-36 through the European Office of Aerospace Research (OAR), United States Air Force.
Adress from October, 1967: Tait Institute, University of Edinburgh Edinburgh.
Traduzione a cura della Redazione.
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Borne, P.O., Polkinghorne, J.C. Fubini identities for Feynman diagrams. Nuovo Cimento A (1965-1970) 53, 538–543 (1968). https://doi.org/10.1007/BF02800129
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DOI: https://doi.org/10.1007/BF02800129