Neutrino production states in oscillation phenomena - are they pure or mixed?

Details Neutrino production states in oscillation phenomena - are they pure or mixed? Neutrino production states in oscillation phenomena - are they pure or mixed?

2007-07-27

arxiv.org/abs/0707.4089v2

J.Phys.G35:065003,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 figures, v2: some corrections added

Scientific paper

10.1088/0954-3899/35/6/065003

General quantum mechanical states of neutrinos produced by mechanisms outside the Standard Model are discussed. The neutrino state is described by the Maki-Nakagawa-Sakata-Pontecorvo unitary mixing matrix only in the case of relativistic neutrinos and Standard Model left-handed charge current interaction. The problem of Wigner spin rotation caused by Lorentz transformation from the rest production frame to the laboratory frame is considered. Moreover, the mixture of the neutrino states as a function of their energy and parameters from the extension of the Standard Model are investigated. Two sources of mixture, the appearance of subdominant helicity states, and mass mixing with several different mixing matrices are studied.

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