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

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 (4.5 σ) is observed in the energy range 200 < E$$QE\atop{v}$$ < 1250 MeV . Combining these data with the $$\overline{v}$$ e appearance data from 11.27 × 10 20 protons on target in antineutrino mode, a total ν e plus $$\overline{v}$$ e charged-current quasielastic event excess of 460.5 ± 99.0 events (4.7 σ) 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 χ2 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.

Authors:
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Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
MiniBooNE Collaboration
OSTI Identifier:
1483346
Alternate Identifier(s):
OSTI ID: 1484651
Report Number(s):
LA-UR-18-24586
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Atomic, Nuclear and Particle Physics; sterile neutrino oscillations

Citation Formats

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., and Zimmerman, E. D. Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.221801.
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. Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment. United States. doi:10.1103/PhysRevLett.121.221801.
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., and Zimmerman, E. D. Mon . "Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment". United States. doi:10.1103/PhysRevLett.121.221801.
@article{osti_1483346,
title = {Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment},
author = {Aguilar-Arevalo, A. A. and Brown, B. C. and Bugel, L. and Cheng, G. and Conrad, J. M. and Cooper, R. L. and Dharmapalan, R. and Diaz, A. and Djurcic, Z. and Finley, D. A. and Ford, R. and Garcia, F. G. and Garvey, G. T. and Grange, J. and Huang, E. -C. and Huelsnitz, W. and Ignarra, C. and Johnson, R. A. and Karagiorgi, G. and Katori, T. and Kobilarcik, T. and Louis, W. C. and Mariani, C. and Marsh, W. and Mills, G. B. and Mirabal, J. and Monroe, J. and Moore, C. D. and Mousseau, J. and Nienaber, P. and Nowak, J. and Osmanov, B. and Pavlovic, Z. and Perevalov, D. and Ray, H. and Roe, B. P. and Russell, A. D. and Shaevitz, M. H. and Spitz, J. and Stancu, I. and Tayloe, R. and Thornton, R. T. and Tzanov, M. and Van de Water, R. G. and White, D. H. and Wickremasinghe, D. A. and Zimmerman, E. D.},
abstractNote = {The MiniBooNE experiment at Fermilab reports results from an analysis of νe appearance data from 12.84 × 1020 protons on target in neutrino mode, an increase of approximately a factor of 2 over previously reported results. A νe charged-current quasielastic event excess of 381.2 ± 85.2 events (4.5 σ) is observed in the energy range 200 < E$QE\atop{v}$ < 1250 MeV . Combining these data with the $\overline{v}$e appearance data from 11.27 × 1020 protons on target in antineutrino mode, a total νe plus $\overline{v}$e charged-current quasielastic event excess of 460.5 ± 99.0 events (4.7 σ) is observed. If interpreted in a two-neutrino oscillation model, νμ → νe, the best oscillation fit to the excess has a probability of 21.1%, while the background-only fit has a χ2 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.},
doi = {10.1103/PhysRevLett.121.221801},
journal = {Physical Review Letters},
number = 22,
volume = 121,
place = {United States},
year = {Mon Nov 26 00:00:00 EST 2018},
month = {Mon Nov 26 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevLett.121.221801

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