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Title: Leptonic CP violation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis

Abstract

We investigate the extent to which leptonic CP-violation in (3+2) sterile neutrino models leads to different oscillation probabilities for {nu}{sub {mu}}{yields}{nu}{sub e} and {nu}{sub {mu}}{yields}{nu}{sub e} oscillations at MiniBooNE. We are using a combined analysis of short-baseline (SBL) oscillation results, including the LSND and null SBL results, to which we impose additional constraints from atmospheric oscillation data. We obtain the favored regions in MiniBooNE oscillation probability space for both (3+2) CP-conserving and (3+2) CP-violating models. We further investigate the allowed CP-violation phase values and the MiniBooNE reach for such a CP violation measurement. The analysis shows that the oscillation probabilities in MiniBooNE neutrino and antineutrino running modes can differ significantly, with the latter possibly being as much as 3 times larger than the first. In addition, we also show that all possible values of the single CP-violation phase measurable at short baselines in (3+2) models are allowed within 99% CL by existing data.

Authors:
; ; ; ; ; ;  [1];  [2];  [3];  [2]
  1. Department of Physics, Columbia University, New York, New York 10027 (United States)
  2. (United States)
  3. (Spain)
Publication Date:
OSTI Identifier:
20933213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.013011; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANTINEUTRINOS; CP INVARIANCE; ELECTRON NEUTRINOS; MUON NEUTRINOS; NEUTRINO OSCILLATION; PROBABILITY

Citation Formats

Karagiorgi, G., Aguilar-Arevalo, A., Conrad, J. M., Shaevitz, M. H., Whisnant, K., Sorel, M., Barger, V., Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia, and Department of Physics, University of Wisconsin, Madison, Wisconsin 53715. Leptonic CP violation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.013011.
Karagiorgi, G., Aguilar-Arevalo, A., Conrad, J. M., Shaevitz, M. H., Whisnant, K., Sorel, M., Barger, V., Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia, & Department of Physics, University of Wisconsin, Madison, Wisconsin 53715. Leptonic CP violation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis. United States. doi:10.1103/PHYSREVD.75.013011.
Karagiorgi, G., Aguilar-Arevalo, A., Conrad, J. M., Shaevitz, M. H., Whisnant, K., Sorel, M., Barger, V., Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia, and Department of Physics, University of Wisconsin, Madison, Wisconsin 53715. Mon . "Leptonic CP violation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis". United States. doi:10.1103/PHYSREVD.75.013011.
@article{osti_20933213,
title = {Leptonic CP violation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis},
author = {Karagiorgi, G. and Aguilar-Arevalo, A. and Conrad, J. M. and Shaevitz, M. H. and Whisnant, K. and Sorel, M. and Barger, V. and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 and Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia and Department of Physics, University of Wisconsin, Madison, Wisconsin 53715},
abstractNote = {We investigate the extent to which leptonic CP-violation in (3+2) sterile neutrino models leads to different oscillation probabilities for {nu}{sub {mu}}{yields}{nu}{sub e} and {nu}{sub {mu}}{yields}{nu}{sub e} oscillations at MiniBooNE. We are using a combined analysis of short-baseline (SBL) oscillation results, including the LSND and null SBL results, to which we impose additional constraints from atmospheric oscillation data. We obtain the favored regions in MiniBooNE oscillation probability space for both (3+2) CP-conserving and (3+2) CP-violating models. We further investigate the allowed CP-violation phase values and the MiniBooNE reach for such a CP violation measurement. The analysis shows that the oscillation probabilities in MiniBooNE neutrino and antineutrino running modes can differ significantly, with the latter possibly being as much as 3 times larger than the first. In addition, we also show that all possible values of the single CP-violation phase measurable at short baselines in (3+2) models are allowed within 99% CL by existing data.},
doi = {10.1103/PHYSREVD.75.013011},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • No abstract prepared.
  • These proceedings provide a summary of results from a combined analysis of short-baseline (SBL) oscillation data, including data from LSND and MiniBooNE, under a 3 active +2 sterile neutrino oscillation hypothesis. The analysis is done within both a CP-conserving (CPC) and a CP-violating (CPV) framework. The implications for any possible leptonic CP violation that is allowed by a combined analysis of the null-SBL and LSND experiments are discussed in relation to the MiniBooNE experiment.
  • We investigate adding two sterile neutrinos to resolve the apparent tension existing between short-baseline neutrino oscillation results and CPT-conserving, four-neutrino oscillation models. For both (3+1) and (3+2) models, the level of statistical compatibility between the combined dataset from the null short-baseline experiments Bugey, CHOOZ, CCFR84, CDHS, KARMEN, and NOMAD, on the one hand; and the LSND dataset, on the other, is computed. A combined analysis of all seven short-baseline experiments, including LSND, is also performed, to obtain the favored regions in neutrino mass and mixing parameter space for both models. Finally, four statistical tests to compare the (3+1) and themore » (3+2) hypotheses are discussed. All tests show that (3+2) models fit the existing short-baseline data significantly better than (3+1) models.« 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