Neutrino Flavor Ratio on Earth and at Astrophysical Sources

Abstract

We present the reconstruction of neutrino flavor ratios at astrophysical sources. For distinguishing the pion source and the muon-damped source to the 3$\sigma$ level, the neutrino flux ratios, $R\equiv \varphi ({\nu }_{\mu })/(\varphi ({\nu }_e)+\varphi ({\nu }_{\tau }))$ and $S\equiv \varphi ({\nu }_e)/\varphi ({\nu }_{\tau })$, need to be measured in accuracies better than 10%.

Comments: 3 pages, 8 figures. Talk presented by T.C. Liu in ERICE 2009, Sicily.