Author(s)

Konstantin Karplyuk^1*, Oleksandr Zhmudskyy²

¹Department of Radiophysics, Taras Shevchenko University, Kyiv, Ukraine.
²Department of Physics, University of Central Florida, Orlando, FL, USA.

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.

Quantum Electrodynamics, Amplitude Square, Polarized Particles

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.