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The Universal Expression for the Amplitude Square in Quantum Electrodynamics

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DOI: 10.4236/jmp.2015.615226    2,802 Downloads   3,085 Views  


The universal expression for the amplitude square  for any matrix of interaction M is derived. It has obvious covariant form. It allows the avoidance of calculation of products of the Dirac’s matrices traces and allows easy calculation of cross-sections of any different processes with polarized and unpolarized particles.

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The authors declare no conflicts of interest.

Cite this paper

Karplyuk, K. and Zhmudskyy, O. (2015) The Universal Expression for the Amplitude Square in Quantum Electrodynamics. Journal of Modern Physics, 6, 2219-2225. doi: 10.4236/jmp.2015.615226.


[1] Feynman, R.P. (1961) Quantum Electrodynamics. Benjamin, New York.
[2] Fedorov, F.I. (1979) Lorentz Group. Nauka, Moskva.
[3] Karplyuk, K.S. and Zhmudskyy, O. (2012) Physical Review D, 86, Article ID: 015015.
[4] Mott, N.F. (1929) Proceedings of the Royal Society of London A, 124, 425.

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