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Title: A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale

Abstract

The MiniBooNE Collaboration reports first results of a search for {upsilon}{sub e} appearance in a {upsilon}{sub {mu}} beam. With two largely independent analyses, we observe no significant excess of events above background for reconstructed neutrino energies above 475 MeV. The data are consistent with no oscillations within a two neutrino appearance-only oscillation model.

Authors:
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Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908843
Report Number(s):
FERMILAB-PUB-07-085-E
Journal ID: ISSN 0031-9007; PRLTAO; arXiv eprint number arXiv:0704.1500; TRN: US0703783
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.Lett.98:231801,2007; Journal Volume: 98
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON NEUTRINOS; NEUTRINOS; OSCILLATIONS; Experiment-HEP

Citation Formats

Aguilar-Arevalo, A.A., /Columbia U., Bazarko, A.O., /Princeton U., Brice, S.J., /Fermilab, Brown, B.C., /Fermilab, Bugel, L., /Columbia U., Cao, J., /Michigan U., Coney, L., /Columbia U., Conrad, J.M., /Columbia U., Cox, D.C., /Indiana U., Curioni, A., /Yale U., Djurcic, Z., and /Columbia U. /Fermilab. A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.231801.
Aguilar-Arevalo, A.A., /Columbia U., Bazarko, A.O., /Princeton U., Brice, S.J., /Fermilab, Brown, B.C., /Fermilab, Bugel, L., /Columbia U., Cao, J., /Michigan U., Coney, L., /Columbia U., Conrad, J.M., /Columbia U., Cox, D.C., /Indiana U., Curioni, A., /Yale U., Djurcic, Z., & /Columbia U. /Fermilab. A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale. United States. doi:10.1103/PhysRevLett.98.231801.
Aguilar-Arevalo, A.A., /Columbia U., Bazarko, A.O., /Princeton U., Brice, S.J., /Fermilab, Brown, B.C., /Fermilab, Bugel, L., /Columbia U., Cao, J., /Michigan U., Coney, L., /Columbia U., Conrad, J.M., /Columbia U., Cox, D.C., /Indiana U., Curioni, A., /Yale U., Djurcic, Z., and /Columbia U. /Fermilab. Sun . "A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale". United States. doi:10.1103/PhysRevLett.98.231801. https://www.osti.gov/servlets/purl/908843.
@article{osti_908843,
title = {A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale},
author = {Aguilar-Arevalo, A.A. and /Columbia U. and Bazarko, A.O. and /Princeton U. and Brice, S.J. and /Fermilab and Brown, B.C. and /Fermilab and Bugel, L. and /Columbia U. and Cao, J. and /Michigan U. and Coney, L. and /Columbia U. and Conrad, J.M. and /Columbia U. and Cox, D.C. and /Indiana U. and Curioni, A. and /Yale U. and Djurcic, Z. and /Columbia U. /Fermilab},
abstractNote = {The MiniBooNE Collaboration reports first results of a search for {upsilon}{sub e} appearance in a {upsilon}{sub {mu}} beam. With two largely independent analyses, we observe no significant excess of events above background for reconstructed neutrino energies above 475 MeV. The data are consistent with no oscillations within a two neutrino appearance-only oscillation model.},
doi = {10.1103/PhysRevLett.98.231801},
journal = {Phys.Rev.Lett.98:231801,2007},
number = ,
volume = 98,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • The MiniBooNE Collaboration reports first results of a search for {nu}{sub e} appearance in a {nu}{sub {mu}} beam. With two largely independent analyses, we observe no significant excess of events above the background for reconstructed neutrino energies above 475 MeV. The data are consistent with no oscillations within a two-neutrino appearance-only oscillation model.
  • Solar and atmospheric neutrino oscillations, recently confirmed by reactor and accelerator-based experiments, are now well established. On the other hand, the interpretation of the LSND {bar {nu}}{sub e} excess [1] as {bar {nu}}{sub {mu}} {yields} {bar {nu}}{sub e} oscillations at the {Delta}m{sup 2} {approx} 1 eV{sup 2} scale lacked for many years experimental confirmation or refutation. The primary goal of the MiniBooNE experiment [2] is to address this anomaly in an unambiguous and independent way. The MiniBooNE flux is obtained via a high-intensity, conventional neutrino beam. Secondary hadrons, mostly pions and kaons, are produced via the interactions of 8 GeVmore » protons from the Fermilab Booster accelerator with a thick beryllium target, and are focused by a horn. The switchable horn polarity allows for both neutrino and antineutrino running modes. The neutrino beam is produced via the decay of secondary mesons and muons in a 50 m long decay region. Overall, about 9.5 x 10{sup 20} protons on target have been accumulated over the five years of beamline operation, 5.6 x 10{sup 20} of which are used in this oscillation analysis, based on the neutrino running mode sample only. The MiniBooNE detector is located 540 m away from the beryllium target. The detector is a 12 m in diameter sphere filled with 800 t of undoped mineral oil, whose inner region is instrumented with 1280 photomultiplier tubes (PMTs). Neutrino interactions produce prompt, ring-distributed Cherenkov light, and delayed, isotropic scintillation light. Light transmission is affected by fluorescence, scattering, absorption and reflections. The outer detector region is used to reject cosmic ray activity or uncontained neutrino interactions. About 7.7 x 10{sup 5} neutrino interactions have been collected at MiniBooNE. The goal of the first MiniBooNE electron appearance analysis is two-fold: perform a model-independent search for a {nu}{sub e} excess (or deficit), and interpret the data within a two neutrino, appearance-only {nu}{sub {mu}} {yields} {nu}{sub e} oscillation context, to test this interpretation of the LSND anomaly [2]. This was a blind analysis.« less
  • This paper examines sterile neutrino oscillation models in light of recently published results from the MiniBooNE Experiment. The new MiniBooNE data include the updated neutrino results, including the low-energy region, and the first antineutrino results, as well as first results from the off-axis NuMI beam observed in the MiniBooNE detector. These new global fits also include data from LSND, KARMEN, NOMAD, Bugey, CHOOZ, CCFR84, and CDHS. Constraints from atmospheric oscillation data have been imposed. We test the validity of the three-active plus one-sterile (3+1) and two-sterile (3+2) oscillation hypotheses, and we estimate the allowed range of fundamental neutrino oscillation parametersmore » in each case. We assume CPT-invariance throughout. However, in the case of (3+2) oscillations, CP violation is allowed. We find that, with the addition of the new MiniBooNE data sets, a (3+2) oscillation hypothesis provides only a marginally better description of all short-baseline data over a (3+1) oscillation hypothesis. In the case of (3+2) CP-violating models, we obtain good {chi}{sup 2}-probabilities in general due to the large number of fit parameters. However, we find large incompatibilities among appearance and disappearance experiments, consistent with previous analyses. Aside from LSND, the data sets responsible for this tension are the MiniBooNE neutrino data set, CDHS, and the atmospheric constraints. In addition, new incompatibilities are found between the appearance experiments themselves (MiniBooNE, LSND, KARMEN and NOMAD), independent of CP-violation assumptions. On the other hand, fits to antineutrino-only data sets, including appearance and disappearance experiments, are found significantly more compatible, even within a (3+1) oscillation scenario.« less
  • The SciBooNE and MiniBooNE collaborations report the results of a ν μ disappearance search in the &Delta'm 2 region of 0.5-40 eV 2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on ν μ disappearance in the 0.5-40 eV 2 Δm 2 region, with an improvement over previous experimental constraints between 10 and 30 eV 2