Measuring flavor ratios of high-energy astrophysical neutrinos

Beacom, John F.; Bell, Nicole F.; Hooper, Dan; Pakvasa, Sandip; Weiler, Thomas J.

doi:10.1103/PhysRevD.68.093005

Measuring flavor ratios of high-energy astrophysical neutrinos

Journal Article · Tue Jul 01 04:00:00 EDT 2003 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.68.093005· OSTI ID:1875890

^[1]; ^[2]; ^[3]; ^[4]; ^[5]

Fermilab
Fermilab; Santa Barbara, KITP
Wisconsin U., Madison
Hawaii U.; Santa Barbara, KITP
Vanderbilt U.; Santa Barbara, KITP

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.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1875890

Report Number(s):: FERMILAB-PUB-03-180-A; MADPH-03-1336; arXiv:hep-ph/0307025; oai:inspirehep.net:622515

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 68

Country of Publication:: United States

Language:: English

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