Using the non-observation of ultrahigh-energy neutrinos at the Pierre Auger Observatory, the collaboration sets 90% confidence limits on the active-sterile transition magnetic moment for sterile neutrino masses between 1 and 100 TeV.
Neutrino Moments and the Magnetic Primakoff Effect
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abstract
If different species of neutrinos possess transition magnetic moments, a conversion between species can occur in the Coulomb field of a nucleus. In the case of Dirac neutrinos this corresponds to an active to sterile conversion, whereas in the case of Majorana neutrinos, the conversion takes place between active species. The conversion cross sections grow with the energy of the incident neutrino. The formalism is also applied to a new type of experiment designed to test the existence of the ``KARMEN anomaly''.
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Search for active-sterile neutrino transitions using Pierre Auger Observatory data
Using the non-observation of ultrahigh-energy neutrinos at the Pierre Auger Observatory, the collaboration sets 90% confidence limits on the active-sterile transition magnetic moment for sterile neutrino masses between 1 and 100 TeV.