Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-07-01
Phys.Rev. D68 (2003) 093005; Erratum-ibid. D72 (2005) 019901
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 14 figures; combined published paper and appended erratum
Scientific paper
10.1103/PhysRevD.68.093005
We discuss the prospects for next generation neutrino telescopes, such as IceCube, to measure the flavor ratios of high-energy astrophysical neutrinos. The expected flavor ratios at the sources are $\phi_{\nu_e}:\phi_{\nu_{\mu}}:\phi_{\nu_{\tau}} = 1:2:0$, and neutrino oscillations quickly transform these to $1:1:1$. The flavor ratios can be deduced from the relative rates of showers ($\nu_e$ charged-current, most $\nu_\tau$ charged-current, and all flavors neutral-current), muon tracks ($\nu_\mu$ charged-current only), and tau lepton lollipops and double-bangs ($\nu_\tau$ charged-current only). The peak sensitivities for these interactions are at different neutrino energies, but the flavor ratios can be reliably connected by a reasonable measurement of the spectrum shape. Measurement of the astrophysical neutrino flavor ratios tests the assumed production mechanism and also provides a very long baseline test of a number of exotic scenarios, including neutrino decay, CPT violation, and small-$\delta m^2$ oscillations to sterile neutrinos.
Beacom John F.
Bell Nicole F.
Hooper Dan
Pakvasa Sandip
Weiler Thomas J.
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