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

Details Indications of Neutrino Oscillation in a 250 km Long-baseline Experiment Indications of Neutrino Oscillation in a 250 km Long-baseline Experiment

2002-12-04

arxiv.org/abs/hep-ex/0212007v2

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%.

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