The sign of dm2_{31} and the muon-charge asymmetry for atmospheric neutrinos

Abstract

We discuss the possibility to measure the sign of dm2_{31} from matter-induced charge asymmetries in atmospheric neutrino oscillations. The main conclusion is that an impact on the nu_mu survival probability requires the action of the MSW resonance, which becomes visible for baselines above \~7000 km.

Comments: 6 pp, 1 fig. Talk given at the 7th International Workshop on Topics in Astroparticles and Underground Physics (TAUP2001), Laboratori Nazionali del Gran Sasso, Italy, September 8-12, 2001