Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-10-26
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, Baksan School LaTeX style; submitted to the Proceedings of the 15th International Baksan School "Particles and Cosmo
Scientific paper
We summarize our recent results on the description of the evolution of Majorana neutrinos in external fields. First we discuss the purely quantum method which involves the secondly quantized Weyl spinors. In frames of this formalism we find exact solutions of the classical Hamilton equations for Weyl fields in background matter, which then are used to canonically quantize the system. The analog of the effective Hamiltonian for the description of spin-flavor oscillations of Majorana neutrinos in matter and a magnetic field is also obtained. Finally we discuss another approach for the treatment of Majorana neutrinos in external fields, which is based on the relativistic quantum mechanics. The latter method does not require the quantization of the neutrino wave function. Nevertheless we demonstrate that the relativistic quantum mechanics approach also appropriately describes spin-flavor oscillations of relativistic Majorana neutrinos.
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