Abstract
We report an updated measurement of muon neutrino disappearance in the NuMI neutrino beam performed using the MINOS detectors. This preliminary result is based on an increased data set corresponding to 2.50 × 1020 protons on the NuMI target, and incorporates a number of improvements to our analysis. We observe 563 candidate vμ CC interactions in the far detector data, compared with an expectation of 738 ± 30 in the absence of oscillations. A maximum likelihood fit to the observed far detector energy spectrum assuming two-flavour vμ → vτ oscillations yields best fit oscillation parameters of Δm223 = 2.38+0.20−0.16 × 10−3eV2 and sin22θ23 = 1.00−0.08 with errors quoted at the 68% confidence level.
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