Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-06-05
Physics
High Energy Physics
High Energy Physics - Experiment
Contribution to the 27th ICRC (Hamburg, August 7-15, 2001), 4 pages, 1 figure
Scientific paper
A strong body of evidence now exists for atmospheric nu_mu disappearance oscillations. Such disappearance could be explained by oscillations to either nu_tau or a ``sterile'' neutrino (nu_s). Super-Kamiokande uses three different methods to distinguish between these two scenarios. First, matter effects would suppress the nu_mu <-> nu_s oscillation amplitude at high energy. Second, oscillation to nu_s would reduce the overall neutral-current neutrino interaction rate. Third, the smoking gun of nu_mu <-> nu_tau oscillations would be the observation of tau appearance resulting from charged-current nu_tau interactions. The results of these three techniques are presented, which strongly favor nu_mu <-> nu_tau oscillations over nu_mu <-> nu_s.
for the Super-Kamiokande Collaboration
Habig Alec
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