Abstract

The results from the initial exposure of the MINOS detectors to neutrinos produced by the Fermilab NuMI beam are reported here. The exposure consisted of 1.27 × 10 20 120 GeV protons incident on the NuMI target. The data show the observation of 215 neutrinos with energies below 30 GeV while 336 ± 14.4 events were expected. The data are consistent with ν μ disappearance via neutrino oscillations with | Δ m 23 2 | = 2.74 −0.26 +0.44 × 10 −3 eV 2 / c 4 and sin 2 2 θ 23 > 0.87 (68% C.L.).

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