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Advances in High Energy Physics
Volume 2013, Article ID 163897, 26 pages
http://dx.doi.org/10.1155/2013/163897
Review Article

Sterile Neutrino Fits to Short-Baseline Neutrino Oscillation Measurements

1Massachusetts Institute of Technology, Cambridge, MA 02139, USA
2Columbia University, New York, NY 10027, USA

Received 13 July 2012; Accepted 11 September 2012

Academic Editor: Koichiro Nishikawa

Copyright © 2013 J. M. Conrad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper reviews short-baseline oscillation experiments as interpreted within the context of one, two, and three sterile neutrino models associated with additional neutrino mass states in the ~1 eV range. Appearance and disappearance signals and limits are considered. We show that fitting short-baseline datasets to a 3 + 3 (3 + 2) model, defined by three active and three (two) sterile neutrinos, results in an overall goodness of fit of 67% (69%) and good compatibility between data sets—to be compared to a 3 + 1 model with a 55% goodness of fit. While the (3 + 3) fit yields the highest quality overall, it still finds inconsistencies with the MiniBooNE appearance datasets; in particular, the global fit fails to account for the observed MiniBooNE low-energy excess. Given the overall improvement, we recommend using the results of (3 + 2) and (3 + 3) fits, rather than (3 + 1) fits, for future neutrino oscillation phenomenology. These results motivate the pursuit of further short-baseline experiments, such as those reviewed in this paper.