Indications of Neutrino Oscillation in a 250 km Long-Baseline Experiment

M. H. Ahn et al.
Phys. Rev. Lett. 90, 041801 – Published 30 January 2003

Abstract

The K2K experiment observes indications of neutrino oscillation: a reduction of νμ flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.15.4+6.2. Twenty-nine one ring μ-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.

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  • Received 4 December 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.041801

©2003 American Physical Society

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Vol. 90, Iss. 4 — 31 January 2003

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