On Z → γγ decay and cancellation of axial anomaly in Z → γγ transition amplitude for massive fermions

Z → γγ decay amplitude is considered and proven to be zero due to properties of polarization vectors and Bose statistics. Triangular diagrams for a pseudoscalar → γγ and Z → γγ processes with massive fermions in the loop are explicitely calculated. In the Standard Model axial anomaly vanishes in the...

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Bibliographic Details
Published in:Physics of atomic nuclei 2014-11, Vol.77 (11), p.1390-1399
Main Author: Zhemchugov, E. V.
Format: Article
Language:English
Subjects:
Elementary Particles and Fields
Particle and Nuclear Physics
Physics
Physics and Astronomy
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Summary:Z → γγ decay amplitude is considered and proven to be zero due to properties of polarization vectors and Bose statistics. Triangular diagrams for a pseudoscalar → γγ and Z → γγ processes with massive fermions in the loop are explicitely calculated. In the Standard Model axial anomaly vanishes in the sum of these diagrams as Z boson is mixed with one of the Goldstone bosons.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778814100147