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Evidence for oscillation of atmospheric neutrinos

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arxiv hep-ex/9807003 v2 pith:TRF4CLEB submitted 1998-07-03 hep-ex

classification hep-ex
keywords atmosphericdataneutrinoneutrinosanalysisanglebiasescalculations
verification ladder T0 review T1 audit T2 compute T3 formal
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We present an analysis of atmospheric neutrino data from a 33.0 kiloton-year (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor nu_mu <-> nu_tau oscillations with sin^2(2theta)>0.82 and 5x10^-4 < delta m^2 < 6x10^-3 eV^2 at 90% confidence level.

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