Exotic Neutrino Interactions in Cosmic Rays
نویسنده
چکیده
The spectrum of extra-galactic cosmic rays (CRs) is expected to follow the GreisenZatsepin-Kuzmin (GZK) cutoff at about 5× 10 GeV which results from energy losses of charged nuclei in the cosmic microwave background. So far the confrontation of this feature with CR data is inconclusive. In the absence of close-by sources a power-law continuation of the spectrum might signal the contribution of new physics. We have investigated the statistical significance of a model where exotic interactions of cosmogenic neutrinos are the origin of super-GZK events. A strong neutrino-nucleon interaction is favored by CR data, even if we account for a systematic shift in energy calibration.
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تاریخ انتشار 2006