New constraints on muon-neutrino to electron-neutrino transitions 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

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Abstract

This paper reports results from a search for ν_μ → ν_e transitions by the MINOS experiment based on a 7×10^(20) protons-on-target exposure. Our observation of 54 candidate ν_e events in the far detector with a background of 49.1±7.0(stat)±2.7(syst) events predicted by the measurements in the near detector requires 2sin^2(2θ_(13))sin^2θ_(23)<0.12(0.20) at the 90% C.L. for the normal (inverted) mass hierarchy at δ_(CP)=0. The experiment sets the tightest limits to date on the value of θ_(13) for nearly all values of δ_(CP) for the normal neutrino mass hierarchy and maximal sin^2(2θ_(23)).

Additional Information

© 2010 The American Physical Society. Received 7 June 2010; published 21 September 2010. 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 DNR, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contributions to this effort.

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