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Unexplained excess of electron-like events from a 1-GeV neutrino beam

Research output: Contribution to journalJournal article

Published

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Journal publication date11/03/2009
JournalPhysical Review Letters
Journal number10
Volume102
Number of pages5
Original languageEnglish

Abstract

The MiniBooNE Collaboration observes unexplained electronlike events in the reconstructed neutrino energy range from 200 to 475 MeV. With 6.46×1020 protons on target, 544 electronlike 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 ν̅ e charged-current scattering or 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.

Bibliographic note

© 2009 The American Physical Society