Measurement of a small atmospheric $ν_μ/ν_e$ ratio

Details Measurement of a small atmospheric $ν_μ/ν_e$ ratio Measurement of a small atmospheric $ν_μ/ν_e$ ratio

1998-03-06

arxiv.org/abs/hep-ex/9803006v1

Phys.Lett. B433 (1998) 9-18

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages with 5 figures

Scientific paper

From an exposure of 25.5~kiloton-years of the Super-Kamiokande detector, 900 muon-like and 983 electron-like single-ring atmospheric neutrino interactions were detected with momentum $p_e > 100$ MeV/$c$, $p_\mu > 200$ MeV/$c$, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was measured to be $0.61 \pm 0.03(stat.) \pm 0.05(sys.)$, consistent with previous results from the Kamiokande, IMB and Soudan-2 experiments, and smaller than expected from theoretical models of atmospheric neutrino production.

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