Within the framework of the perturbative quantum field-theoretical approach with the distance-dependent propagator, neutrino oscillations in matter are considered. In the approximation of two neutrino flavors, the distance-dependent propagator is constructed that describes the propagation of neutrinos in a stationary non-polarized homogeneous medium. Using this propagator, the corresponding probability of the neutrino oscillation process is found, where the neutrinos are detected through the weak charged- and neutral-current interactions. It is shown that the results coincide with those obtained in the framework of the standard quantum-mechanical description. Several specific examples of processes are considered and the MSW effect is discussed.
11.10.-z Field theory
14.60.Pq Neutrino mass and mixing
$^1$D.V.Scobeltsyn Institute of Nuclear Physics,Lomonosov Moscow State University,
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