Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LATEX, 1 EPS figure, talk presented at the 12th International Seminar "Quarks-2002", Valday and Novgorod, Russia, Ju
Scientific paper
A general analysis of the n-vertex loop amplitude in a strong magnetic field is performed, based on the asymptotic form of the electron propagator in the field. As an example, the photon-neutrino processes are considered, where one vertex in the amplitude is of a general type, and the other vertices are of the vector type. It is shown, that for odd numbers of vertices only the SV_1 ... V_{n-1} amplitude grows linearly with the magnetic field strength, while for even numbers of vertices the linear growth takes place only in the amplitudes PV_1 ... V_{n-1}, VV_1 ... V_{n-1} and AV_1 ... V_{n-1}. The general expressions for the amplitudes of the processes gamma gamma -> nu bar nu (in the framework of the model with the effective nu nu e e - coupling of a scalar type) and gamma gamma -> nu bar nu gamma (in the framework of the Standard Model) for arbitrary energies of particles are obtained. A comparison with existing results is performed.
Kuznetsov Alexander Vasilievich
Mikheev Nickolay V.
Rumyantsev D. A.
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