Indications of neutrino oscillation in a 250 km long-baseline experiment

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The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) 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 80.1(-5.4)(+6.2). Twenty-nine one ring mu-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%.
Publisher
AMER PHYSICAL SOC
Issue Date
2003-01
Language
English
Article Type
Article
Keywords

CONSTRUCTION

Citation

PHYSICAL REVIEW LETTERS, v.90, no.4

ISSN
0031-9007
DOI
10.1103/PhysRevLett.90.041801
URI
http://hdl.handle.net/10203/212337
Appears in Collection
PH-Journal Papers(저널논문)
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