Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-13
JHEP 0810:034,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
51 Pages, 31 Figures, Revised final version to appear on JHEP
Scientific paper
10.1088/1126-6708/2008/10/034
We present a study of the mechanism of anomaly cancellation using only transverse invariant amplitudes on anomaly diagrams at higher perturbative orders. The method is the realization of the Green-Schwarz (GS) mechanism at field theory level, which restores the Ward identities by a subtraction of the anomaly pole. Some of the properties of the GS vertex are analyzed both in the context of unitarity and of the organization of the related perturbative expansion. We investigate the role played by the GS and the Wess-Zumino vertices in the anomalous magnetic moment of the muon and in the hyperfine splitting of muonium, which are processes that can be accompanied by the exchange of a virtual anomalous extra Z-prime and an axion-like particle.
Armillis Roberta
Coriano' Claudio
Guzzi Marco
Morelli Simone
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