Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-05-09
Phys.Lett. B436 (1998) 33-41
Physics
High Energy Physics
High Energy Physics - Experiment
14 pages with 6 figures, minor changes for publication
Scientific paper
The flavor ratio of the atmospheric neutrino flux and its zenith angle dependence have been studied in the multi-GeV energy range using an exposure of 25.5 kiloton-years of the Super-Kamiokande detector. By comparing the data to a detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was measured to be $0.66\pm0.06(stat.)\pm0.08(sys.)$. In addition, a strong distortion in the shape of the $\mu$-like event zenith angle distribution was observed. The ratio of the number of upward to downward $\mu$-like events was found to be 0.52$^{+0.07}_{-0.06}(stat.)\pm0.01(sys.)$, with an expected value of $0.98\pm0.03(stat.)\pm0.02(sys.)$, while the same ratio for the $e$-like events was consistent with unity.
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