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Browsing by Author "Collaboration, T. M."

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    Improved Search for ν¯µ → ν¯e Oscillations in the MiniBooNE Experiment
    Collaboration, T. M.; Aguilar-Arevalo, A. A.; Brown, B. C.; Bugel, L.; Cheng, G.; Church, E. D.; Conrad, Janet M.; Dharmapalan, R.; Djurcic, Zelimir; Finley, D. A.; Ford, R.; Garcia, F. G.; Garvey, G. T.; Grange, J.; Huelsnitz, W.; Ignarra, C. M.; Imlay, R.; Johnson, R. A.; Karagiorgi, Georgia S.; Katori, T.; Kobilarcik, T.; Louis, W. C.; Mariani, Camillo; Marsh, W.; Mills, G. B.; Mirabal, J.; Moore, C. D.; Mousseau, J.; Nienaber, P.; Osmanov, B.; Pavlovic, Z.; Perevalov, D.; Polly, C. C.; Ray, H.; Roe, B. P.; Russell, A. D.; Shaevitz, Marjorie Hansen; Spitz, Joshua; Stancu, Ion; Tayloe, R.; Water, R. G. V. D.; White, D. H.; Wickremasinghe, D. A.; Zeller, Geralyn P.; Zimmerman, E. D. (2013-03-12)
    The MiniBooNE experiment at Fermilab reports results from an analysis of ¯νe appearance data from 11.27 × 10²⁰ protons on target in antineutrino mode, an increase of approximately a factor of two over the previously reported results. An event excess of 78.4 ± 28.5 events (2.8σ) is observed in the energy range 200 < EQE ν < 1250 MeV. If interpreted in a two-neutrino oscillation model, ν¯µ → ν¯e, the best oscillation fit to the excess has a probability of 66% while the background-only fit has a χ 2 -probability of 0.5% relative to the best fit. The data are consistent with antineutrino oscillations in the 0.01 < ∆m² < 1.0 eV² range and have some overlap with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector (LSND). All of the major backgrounds are constrained by in-situ event measurements so non-oscillation explanations would need to invoke new anomalous background processes. The neutrino mode running also shows an excess at low energy of 162.0 ± 47.8 events (3.4σ) but the energy distribution of the excess is marginally compatible with a simple two neutrino oscillation formalism. Expanded models with several sterile neutrinos can reduce the incompatibility by allowing for CP violating effects between neutrino and antineutrino oscillations.