Observable Medium Effects For Atmospheric Neutrinos

Abstract

We discuss the possibility to observe matter effects 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. The associated muon charge asymmetry carries information on theta_{13} and the sign of Dm^2_{31}.

Comments: 7 pp, 2 fig. Talk given at the EPS-Conference on HEPP, Budapest (Hungary), July 2001, to be published in the Proceedings