Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-12-04
Phys.Rev.Lett.90:041801,2003
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 3 figures embedded, LaTeX with RevTeX style, accepted for publication in PRL on December 13, 2002
Scientific paper
10.1103/PhysRevLett.90.041801
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 $80.1^{+6.2}_{-5.4}$. 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%.
Ahn Myoung-Hwan
K2K Collaboration
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