Phys. Rev. Lett. 81, 1562 - 1567 (1998)

Evidence for Oscillation of Atmospheric Neutrinos

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Y. Fukuda et al. (Super-Kamiokande Collaboration)
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Featured in Phys. Rev. Focus Received 6 July 1998

We present an analysis of atmospheric neutrino data from a 33.0 kton yr (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 νμ↔ντ oscillations with sin22θ>0.82 and 5×10-4m2<6×10-3 eV 2 at 90% confidence level.


©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v81/p1562
DOI: 10.1103/PhysRevLett.81.1562
PACS: 14.60.Pq, 96.40.Tv

* Present address: NASA, JPL, Pasadena, CA 91109.
Present address: High Energy Accelerator Research Organization (KEK), Accelerator Laboratory, Tsukuba, Ibaraki 305-0801, Japan.
Present address: University of Chicago, Enrico Fermi Institute, Chicago, IL 60637.
§ Present address: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
** Present address: Stanford University, Department of Physics, Stanford, CA 94305.

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