Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-01-11
Phys.Lett.B480:135-139,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, some comments and references added, to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(00)00376-2
The dispersion relation in matter of ultrahigh-energy neutrinos above the pole of the $W$ resonance ($E_{\nu} \gsim {\rm 10}^{7} {\rm GeV} $), is studied. We perform our calculation using the real-time formulation of Thermal Field Theory in which the massless limit for the $W$ boson is taken. The range of active-to-sterile neutrino oscillation parameters for which there is significant mixing enhancement during propagation through the interior of the Earth, and therefore significant attenuation of neutrino beams in the Earth at high energies, is estimated. Finally, this range is considered in view of the cosmological and astrophysical constraints.
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