# The 2009 Europhysics Conference on High Energy Physics

Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

## Determination of the Neutrino Flavor Ratio at the Astrophysical Source

Jul 16, 2009, 3:45 PM
15m
Middle Lecture Hall B (Kraków, Poland)

### Middle Lecture Hall B

#### Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Astroparticle Physics

### Speaker

Prof. Guey-Lin Lin (National Chiao-Tung University)

### Description

We discuss the reconstruction of neutrino flavor ratios at astrophysical sources from future neutrino-telescope measurements, given the knowledge of neutrino mixing angles obtained from terrestrial experiments. With a statistical analysis, we demonstrate that the pion source and the muon-damped source can be distinguished at the $3\, \sigma$ level provided the accuracies on measuring $R\equiv\phi (\nu_{\mu})/\left(\phi (\nu_{e})+\phi (\nu_{\tau})\right)$ and $S\equiv\phi (\nu_e)/\phi (\nu_{\tau})$ can both reach $10\%$. On the other hand, the above two sources are very difficult to distinguish by merely measuring $R$ alone. We also discuss the effect of leptonic CP phase on such a flavor-ratio reconstruction.

### Primary author

Prof. Guey-Lin Lin (National Chiao-Tung University)

### Co-authors

Dr Kwang-Chang Lai (National Chiao-Tung University) Mr Tsung-Che Liu (National Chiao-Tung University)

 Slides