Measurement of a small atmospheric ${\nu }_{\mu }/{\nu }_e$ ratio

Abstract

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.

14 pages with 5 figures

Cited by in corpus (357)

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