Analytical description of the Day-Night neutrino asymmetry

A. D. SUPANITSKY; J.C. D'OLIVO; G. MEDINA-TANCO

Mérida, Mexico

Conferencia; 30th International Cosmic Ray Conference; 2007

We present a new treatment of the Earth matter effects on neutrino oscillations that is valid for an arbitrary density profile. When applied to the study of the day-night effect on the solar neutrino flux it renders a simple analytical expression, which is more accurate than those derived by using the perturbation theory and can be extended to higher energies.