Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-22
Phys.Lett.B666:166-172,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 PS figures, accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2008.07.011
A measurement of the ultrahigh-energy (UHE) cosmic neutrinos at a km^3-size neutrino telescope will open a new window to constrain the 3 x 3 neutrino mixing matrix V and probe possible new physics. We point out that it is in principle possible to examine the non-unitarity of V, which is naturally expected in a class of seesaw models with one or more TeV-scale Majorana neutrinos, by using neutrino telescopes. Considering the UHE neutrinos produced from the decays of charged pions arising from proton-proton and (or) proton-gamma collisions at a distant astrophysical source, we show that their flavor ratios at a terrestrial neutrino telescope may deviate from the democratic flavor distribution \phi^T_e : \phi^T_\mu : \phi^T_\tau = 1 : 1 : 1 due to the seesaw-induced unitarity violation of V. Its effect can be as large as several percent and can serve for an illustration of how sensitive a neutrino telescope should be to this kind of new physics.
Xing Zhi-zhong
Zhou Shun
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