MACRO results on atmospheric neutrino oscillations

Abstract

The final results of the MACRO experiment on atmospheric neutrino oscillations are presented. The data concern different event topologies with average neutrino energies of ~ 3 and ~ 50 GeV. Multiple Coulomb Scattering of the high energy muons was used to estimate the neutrino energy of each event. The angular distributions, the L/E _ν distribution, the particle ratios and the absolute fluxes all favour ν _μ → ν _τ oscillations with maximal mixing and $\Delta m^2 =0.0023 \: \rm eV^2$. A discussion is made on the Monte Carlos used for the atmospheric neutrino flux.

PACS: 13.15.+g ν interactions – 14.60.Pq ν mixing – 96.40.De CR composition energy spectra – 96.40.Tv ν and μ.