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The Universal Expression for the Amplitude Square in Quantum Electrodynamics
The universal expression for the amplitude square ‖̅ufMui‖2 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.
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