Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-11-05
Phys.Rev.D77:072002,2008
Physics
High Energy Physics
High Energy Physics - Experiment
In submission to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.77.072002
We report the results of a search for muon-neutrino disappearance by the Main Injector Neutrino Oscillation Search. The experiment uses two detectors separated by 734 km to observe a beam of neutrinos created by the Neutrinos at the Main Injector facility at Fermi National Accelerator Laboratory. The data were collected in the first 282 days of beam operations and correspond to an exposure of 1.27e20 protons on target. Based on measurements in the Near Detector, in the absence of neutrino oscillations we expected 336 +/- 14 muon-neutrino charged-current interactions at the Far Detector but observed 215. This deficit of events corresponds to a significance of 5.2 standard deviations. The deficit is energy dependent and is consistent with two-flavor neutrino oscillations according to delta m-squared = 2.74e-3 +0.44/-0.26e-3 eV^2 and sin^2(2 theta) > 0.87 at 68% confidence level.
for the MINOS Collaboration
Kordosky Michael
Petyt David
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