Coherent Neutrino Interactions in a Dense Medium

Details Coherent Neutrino Interactions in a Dense Medium Coherent Neutrino Interactions in a Dense Medium

1997-04-17

arxiv.org/abs/hep-ph/9704346v2

Phys.Rev. D56 (1997) 5776-5785

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 6 figures, Latex; minor changes, one reference added; version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.56.5776

Motivated by the effect of matter on neutrino oscillations (the MSW effect) we study in more detail the propagation of neutrinos in a dense medium. The dispersion relation for massive neutrinos in a medium is known to have a minimum at nonzero momentum p \sim (G_F\rho)/\sqrt{2}. We study in detail the origin and consequences of this dispersion relation for both Dirac and Majorana neutrinos both in a toy model with only neutral currents and a single neutrino flavour and in a realistic "Standard Model" with two neutrino flavours. We find that for a range of neutrino momenta near the minimum of the dispersion relation, Dirac neutrinos are trapped by their coherent interactions with the medium. This effect does not lead to the trapping of Majorana neutrinos.

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