Coherence and the Day - Night Asymmetry in the Solar Neutrino Flux

Details Coherence and the Day - Night Asymmetry in the Solar Neutrino Flux Coherence and the Day - Night Asymmetry in the Solar Neutrino Flux

1999-03-11

arxiv.org/abs/hep-ph/9903329v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, latex, no figures

Scientific paper

We consider the day-night asymmetries predicted by MSW solutions of the solar neutrino problem. The integration over the neutrino energy, as well as over the production region or over the time intervals of more than a day leads to the averaging of oscillations on the way to the earth. This is equivalent to considering the neutrino state arriving at the surface of the earth as an incoherent mixture of the neutrino mass eigenstates (even if there is no divergence of wavepackets). As a consequence, the $\nu_e$-regeneration effect inside the earth is incoherent, in contrast with the result in hep-ph/9902435.

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