Improved Search for Muon-Neutrino to Electron-Neutrino Oscillations in MINOS

Creators: Adamson, P.; Himmel, A.; Michael, D. G.; Mualem, L.; Newman, H. B.; Ochoa-Ricoux, J. P.; Orchanian, M.; Patterson, R. B.; MINOS Collaboration

Abstract

We report the results of a search for ν_e appearance in a ν_μ beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2×10^(20) protons on the NuMI target at Fermilab, we find 2sin^2(θ_(23))sin^2(2θ_(13))<0.12(0.20) at 90% confidence level for δ=0 and the normal (inverted) neutrino mass hierarchy, with a best-fit of 2sin^2(θ_(23))sin^2(2θ_(13))=0.041^(+0.047)_(-0.031)(0.079^(+0.071)_(-0.053). The θ_(13)= 0 hypothesis is disfavored by the MINOS data at the 89% confidence level.

Additional Information

© 2011 American Physical Society. Received 29 July 2011; published 27 October 2011. This work was supported by the U.S. DOE; the U.K. STFC; the U.S. NSF; the State and University of Minnesota; the University of Athens, Greece; and Brazil's FAPESP, CNPq, and CAPES. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contributions to this effort.

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Published - Adamson2011p16441Phys_Rev_Lett.pdf

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