Study of muon neutrino disappearance using the Fermilab Main Injector neutrino beam

Creators: Adamson, P.; Barish, B.; Himmel, A.; Howcroft, C.; Michael, D. G.; Mualem, L.; Newman, H. B.; Ochoa-Ricoux, J. P.; Peck, C. W.; Zheng, H.; MINOS Collaboration

Abstract

We report the results of a search for ν_μ disappearance by the Main Injector Neutrino Oscillation Search [D. G. Michael et al. (MINOS), Phys. Rev. Lett. 97, 191801 (2006).]. 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 1.27×10^(20) protons on target. Based on measurements in the Near Detector, in the absence of neutrino oscillations we expected 336±14 ν_μ 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 |Δm^2|=2.74^(+0.44)_(−0.26)×10^(−3) eV^2/c^4 and sin^22θ>0.87 at 68% confidence level.

Additional Information

© 2008 American Physical Society. Received 7 November 2007; published 4 April 2008. This work was supported by the US DOE; the UK PPARC; the US NSF; the State and University of Minnesota; the University of Athens, Greece and Brazil's FAPESP and CNPq. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contribution to this effort.

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Published - PhysRevD.77.072002.pdf

Submitted - 0711.0769.pdf

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