Schematic of events in the MiniBooNE experiment. The cones are Cherenkov radiation, summed to signal rings on the right. MiniBooNE presents evidence against simple neutrino oscillations involving the existence of a fourth neutrino flavor. See article 231801 and Physics News Update

From the article:

Search for Electron Neutrino Appearance at the $\Delta m^2\sim 1{\mathrm{eV}}^2$ Scale
A. A. Aguilar-Arevalo et al. (MiniBooNE Collaboration)
Phys. Rev. Lett. 98, 231801 (2007)

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