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Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment

Open access
Aguilar-Arevalo, A. A., Brown, B. C., Bugel, L., Cheng, G., Conrad, J. M., Cooper, R. L., Dharmapalan, R., Diaz, A., Djurcic, Z., Finley, D. A., Ford, R., Garcia, F. G., Garvey, G. T., Grange, J., Huang, E.-C., Huelsnitz, W., Ignarra, C., Johnson, R. A., Karagiorgi, G., Katori, T., Kobilarcik, T., Louis, W. C., Mariani, C., Marsh, W., Mills, G. B., Mirabal, J., Monroe, J., Moore, C. D., Mousseau, J., Nienaber, P., Nowak, J., Osmanov, B., Pavlovic, Z., Perevalov, D., Ray, H., Roe, B. P., Russell, A. D., Shaevitz, M. H., Spitz, J., Stancu, I., Tayloe, R., Thornton, R. T., Tzanov, M., Van de Water, R. G., White, D. H., Wickremasinghe, D. A., Zimmerman, E. D., MiniBooNE Collaboration·2018·Physical Review Letters

Abstract

The MiniBooNE experiment at Fermilab reports results from an analysis of ν_{e} appearance data from 12.84×10^{20} protons on target in neutrino mode, an increase of approximately a factor of 2 over previously reported results. A ν_{e} charged-current quasielastic event excess of 381.2±85.2 events (4.5σ) is observed in the energy range 200<E_{ν}^{QE}<1250 MeV. Combining these data with the ν[over ¯]_{e} appearance data from 11.27×10^{20} protons on target in antineutrino mode, a total ν_{e} plus ν[over ¯]_{e} charged-current quasielastic event excess of 460.5±99.0 events (4.7σ) is observed. If interpreted in a two-neutrino oscillation model, ν_{μ}→ν_{e}, the best oscillation fit to the excess has a probability of 21.1%, while the background-only fit has a χ^{2} probability of 6×10^{-7} relative to the best fit. The MiniBooNE data are consistent in energy and magnitude with the excess of events reported by the Liquid Scintillator Neutrino Detector (LSND), and the significance of the combined LSND and MiniBooNE excesses is 6.0σ. A two-neutrino oscillation interpretation of the data would require at least four neutrino types and indicate physics beyond the three neutrino paradigm. Although the data are fit with a two-neutrino oscillation model, other models may provide better fits to the data.

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Authors
Aguilar-Arevalo, A. A., Brown, B. C., Bugel, L., Cheng, G., Conrad, J. M., Cooper, R. L., Dharmapalan, R., Diaz, A., Djurcic, Z., Finley, D. A., Ford, R., Garcia, F. G., Garvey, G. T., Grange, J., Huang, E.-C., Huelsnitz, W., Ignarra, C., Johnson, R. A., Karagiorgi, G., Katori, T., Kobilarcik, T., Louis, W. C., Mariani, C., Marsh, W., Mills, G. B., Mirabal, J., Monroe, J., Moore, C. D., Mousseau, J., Nienaber, P., Nowak, J., Osmanov, B., Pavlovic, Z., Perevalov, D., Ray, H., Roe, B. P., Russell, A. D., Shaevitz, M. H., Spitz, J., Stancu, I., Tayloe, R., Thornton, R. T., Tzanov, M., Van de Water, R. G., White, D. H., Wickremasinghe, D. A., Zimmerman, E. D., & MiniBooNE Collaboration
Venue
Physical Review Letters
Published
2018-11-26
Volume
121
Issue
22
Pages
221801-221801
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2898493623
Cited by
470
References
19
FWCI
37.61
Type
journal article
Language
en
Open access
hybrid

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Aguilar-Arevalo, A. A., Brown, B. C., Bugel, L., Cheng, G., Conrad, J. M., Cooper, R. L., Dharmapalan, R., Diaz, A., Djurcic, Z., Finley, D. A., Ford, R., Garcia, F. G., Garvey, G. T., Grange, J., Huang, E.-C., Huelsnitz, W., Ignarra, C., Johnson, R. A., Karagiorgi, G., . . . MiniBooNE Collaboration. (2018). Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment. Physical Review Letters. https://doi.org/10.1103/physrevlett.121.221801

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