Determination of the neutrino flavor ratio at the astrophysical source
- Institute of Physics, National Chiao-Tung University, Hsinchu 300, Taiwan (China) and Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 106, Taiwan (China)
We discuss the reconstruction of neutrino flavor ratios at astrophysical sources through the future neutrino-telescope measurements. Taking the ranges of neutrino mixing parameters {theta}{sub ij} as those given by the current global fit, we demonstrate by a statistical method that the accuracies in the measurements of energy-independent ratios R{identical_to}{phi}({nu}{sub {mu}})/({phi}({nu}{sub e})+{phi}({nu}{sub {tau}})) and S{identical_to}{phi}({nu}{sub e})/{phi}({nu}{sub {tau}}) among integrated neutrino flux should both be better than 10% in order to distinguish between the pion source and the muon-damped source at the 3{sigma} level. The 10% accuracy needed for measuring R and S requires an improved understanding of the background atmospheric neutrino flux to a better than 10% level in the future. We discuss the applicability of our analysis to practical situations that the diffuse astrophysical neutrino flux arises from different types of sources and each point source has a neutrino flavor ratio varying with energies. We also discuss the effect of the leptonic CP phase on the flavor-ratio reconstruction.
- OSTI ID:
- 21308594
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 10; Other Information: DOI: 10.1103/PhysRevD.80.103005; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Five years of searches for point sources of astrophysical neutrinos with the AMANDA-II neutrino telescope
How astrophysical neutrino sources could be used for early measurements of neutrino mass hierarchy and leptonic CP phase