ИСТИНА

We put forward a modified perturbative formalism, which allows one to describe the processes passing at finite distances during finite time intervals. The approach is based on the Feynman diagram technique in the coordinate representation supplemented by modified rules of passing to the momentum representation. The latter reflect the geometry of neutrino oscillation experiments and lead to a modification of the Feynman propagators of the neutrino mass eigenstates in the momentum representation. We call such modified propagators distance-dependent propagators. The approach correctly reproduces the results of the standard description of neutrino oscillations in vacuum and magnetic field. Unlike the standard approach, it allows one to calculate corrections to the amplitudes of neutrino oscillation processes at low neutrino energies. The approach makes use of only the neutrino mass eigenstates, while the flavor states are not needed and should be amputated by Oссam’s razor. The advantages of the approach are its extreme similarity to the standard Feynman diagram technique, the physical clearness and technical simplicity due to the use of plane waves only. This means that the Standard Model is capable of describing neutrino oscillations in the framework of the modified perturbative quantum field-theoretical formalism based on the use of distance-dependent propagators.