MACRO results on atmospheric neutrinos
G. Giacomelli, A. Margiotta
Abstract
We discuss the final results of the MACRO experiment on atmospheric neutrino oscillations. The data concern 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 event by event. The angular distributions, the L/Enu distribution, the particle ratios and the absolute fluxes all favor numu --> nutau oscillations with maximal mixing and Delta m2 ~0.0023 eV2. Emphasis is given to measured ratios which are not affected by Monte Carlo (MC) absolute normalization; a discussion is made on MC uncertainties. A preliminary search for possible Lorentz invariance violation contributions to atmospheric neutrino oscillations is presented and discussed.
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