Decay of High-Energy Astrophysical Neutrinos

Details Decay of High-Energy Astrophysical Neutrinos Decay of High-Energy Astrophysical Neutrinos

2002-11-19

arxiv.org/abs/hep-ph/0211305v2

Phys.Rev.Lett.90:181301,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. References added. Version to appear in PRL

Scientific paper

10.1103/PhysRevLett.90.181301

Existing limits on the non-radiative decay of one neutrino to another plus a massless particle (e.g., a singlet Majoron) are very weak. The best limits on the lifetime to mass ratio come from solar neutrino observations, and are $\tau/m \agt 10^{-4}$ s/eV for the relevant mass eigenstate(s). For lifetimes even several orders of magnitude longer, high-energy neutrinos from distant astrophysical sources would decay. This would strongly alter the flavor ratios from the $\phi_{\nu_e}:\phi_{\nu_{\mu}}:\phi_{\nu_{\tau}} = 1:1:1$ expected from oscillations alone, and should be readily visible in the near future in detectors such as IceCube.

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