The sign of the day-night asymmetry for solar neutrinos

Details The sign of the day-night asymmetry for solar neutrinos The sign of the day-night asymmetry for solar neutrinos

2000-10-18

arxiv.org/abs/hep-ph/0010213v2

Phys.Rev. D63 (2001) 057303

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 3 figures, typos corrected and references added

Scientific paper

10.1103/PhysRevD.63.057303

A qualitative understanding of the day-night asymmetry for solar neutrinos is provided. The greater night flux in nu_e is seen to be a consequence of the fact that the matter effect in the sun and that in the earth have the same sign. It is shown in the adiabatic approximation for the sun that for all values of the mixing angle theta_V between 0 and pi/2, the night flux of neutrinos is greater than the day flux. Only for small values of theta_V where the adiabatic approximation badly fails does the sign of the day-night asymmetry reverse.

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