Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes

Details Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes

2003-07-10

arxiv.org/abs/hep-ph/0307151v2

Phys.Rev.Lett. 92 (2004) 011101

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures; minor changes, to appear in PRL

Scientific paper

10.1103/PhysRevLett.92.011101

Neutrinos may be pseudo-Dirac states, such that each generation is actually composed of two maximally-mixed Majorana neutrinos separated by a tiny mass difference. The usual active neutrino oscillation phenomenology would be unaltered if the pseudo-Dirac splittings are $\delta m^2 \alt 10^{-12}$ eV$^2$; in addition, neutrinoless double beta decay would be highly suppressed. However, it may be possible to distinguish pseudo-Dirac from Dirac neutrinos using high-energy astrophysical neutrinos. By measuring flavor ratios as a function of $L/E$, mass-squared differences down to $\delta m^2 \sim 10^{-18}$ eV$^2$ can be reached. We comment on the possibility of probing cosmological parameters with neutrinos.

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