2008/12/23 by MiniBooNE Collaboration
Physics and Astronomy · #hep-ex #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevlett.102.101802
published as Phys.Rev.Lett.102:101802,2009 · Reduced length by 30 lines and made minor changes to references
arxiv created 2008/12/23 · arxiv updated 2012/08/27
The MiniBooNE Collaboration observes unexplained electron-like events in the reconstructed neutrino energy range from 200 to 475 MeV. With 6.46 × 1020 protons on target, 544 electron-like events are observed in this energy range, compared to an expectation of 415.2 ± 43.4 events, corresponding to an excess of 128.8 ± 20.4 ± 38.3 events. The shape of the excess in several kinematic variables is consistent with being due to either νe and νe charged-current scattering or to νμ neutral-current scattering with a photon in the final state. No significant excess of events is observed in the reconstructed neutrino energy range from 475 to 1250 MeV, where 408 events are observed compared to an expectation of 385.9 ± 35.7 events.