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

Aguilar-Arevalo, A. A. (Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, CDMX 04510, Mexico) ; Brown, B. C. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Bugel, L. (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) ; Cheng, G. (Columbia University, New York, New York 10027, USA) ; Conrad, J. M. (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) ; Cooper, R. L. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) (New Mexico State University, Las Cruces, New Mexico 88003, USA) ; Dharmapalan, R. (University of Alabama, Tuscaloosa, Alabama 35487, USA) (Argonne National Laboratory, Argonne, Illinois 60439, USA) ; Diaz, A. (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) ; Djurcic, Z. (Argonne National Laboratory, Argonne, Illinois 60439, USA) ; Finley, D. A. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Ford, R. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Garcia, F. G. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Garvey, G. T. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Grange, J. (University of Florida, Gainesville, Florida 32611, USA) ; Huang, E.C. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Huelsnitz, W. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Ignarra, C. (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) ; Johnson, R. A. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Karagiorgi, G. (Columbia University, New York, New York 10027, USA) ; Katori, T. (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) (Queen Mary University of London, London E1 4NS, United Kingdom) ; Kobilarcik, T. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Louis, W. C. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Mariani, C. (Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061, USA) ; Marsh, W. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Mills, G. B. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Mirabal, J. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Monroe, J. (Royal Holloway, University of London, Egham TW20 0EX, United Kingdom) ; Moore, C. D. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Mousseau, J. (University of Michigan, Ann Arbor, Michigan 48109, USA) ; Nienaber, P. (Saint Mary’s University of Minnesota, Winona, Minnesota 55987, USA) ; Nowak, J. (Lancaster University, Lancaster LA1 4YB, United Kingdom) ; Osmanov, B. (University of Florida, Gainesville, Florida 32611, USA) ; Pavlovic, Z. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Perevalov, D. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Ray, H. (University of Florida, Gainesville, Florida 32611, USA) ; Roe, B. P. (University of Michigan, Ann Arbor, Michigan 48109, USA) ; Russell, A. D. (Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA) ; Shaevitz, M. H. (Columbia University, New York, New York 10027, USA) ; Spitz, J. (University of Michigan, Ann Arbor, Michigan 48109, USA) ; Stancu, I. (University of Alabama, Tuscaloosa, Alabama 35487, USA) ; Tayloe, R. (Indiana University, Bloomington, Indiana 47405, USA) ; Thornton, R. T. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Tzanov, M. (University of Colorado, Boulder, Colorado 80309, USA) (Louisiana State University, Baton Rouge, Louisiana 70803, USA) ; Van de Water, R. G. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; White, D. H. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA) ; Wickremasinghe, D. A. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Zimmerman, E. D. (University of Colorado, Boulder, Colorado 80309, USA)

27 November 2018

Abstract: 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 (4.5σ) is observed in the energy range 200<EνQE<1250 MeV. Combining these data with the ν¯e appearance data from 11.27×1020 protons on target in antineutrino mode, a total νe plus ν¯e charged-current quasielastic event excess of 460.5±99.0 events (4.7σ) is observed. If interpreted in a two-neutrino oscillation model, νμνe, the best oscillation fit to the excess has a probability of 21.1%, while the background-only fit has a χ2 probability of 6×107 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.


Published in: Physical Review Letters 121 (2018)
Published by: APS
DOI: 10.1103/PhysRevLett.121.221801
arXiv: 1805.12028
License: CC-BY-4.0



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