Evidence for oscillation of atmospheric neutrinos

1998/07/31 by Kamiokande Collaboration, Y. Fukuda et al · 2 citations
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.81.1562

published as Phys.Rev.Lett.81:1562-1567,1998 · 9 pages (two-column) with 4 figures. Small corrections to Eqn.4 and Fig.3. Final version to appear in PRL

arxiv created 1998/08/31 · arxiv updated 2009/11/30

Abstract

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 sin²(2theta)>0.82 and 5x10^-4 < delta m² < 6x10^-3 eV² at 90% confidence level.

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