On the Interpretation of the Atmospheric Neutrino Data in Terms of Flavor Changing Neutrino Interactions

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  • 29 June 1999
Abstract
Flavour changing (FC) neutrino-matter interactions have been proposed as a solution to the atmospheric neutrino anomaly. Here we perform the analysis of the full set of the recent 45 kTy Super-Kamiokande atmospheric neutrino data, including the zenith angle distribution of the contained events as well as the higher energy upward-going stopping and through-going muon events. Our results show that the FC mechanism can describe the data with a good level of statistical agreement. However when the zenith angle distribution of the through-going muon events is included the oscillation hypothesis provides a much better description. The combined analysis confines the amount of FC to be either maximal or to the level of about (10-20)%.

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