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Title: Multichannel oscillations and relations between LSND, KARMEN, and MiniBooNE, with and without CP violation

Abstract

We show by examples that multichannel mixing can affect both the parameters extracted from neutrino oscillation experiments, and more general conclusions derived by fitting the experimental data under the assumption that only two channels are involved in the mixing. Implications for MiniBooNE are noted and an example based on maximal CP violation displays profound implications for the two data sets ({nu}{sub {mu}} and {nu}{sub {mu}}) of that experiment.

Authors:
; ;  [1];  [2];  [3]
  1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. (United States)
  3. (Australia)
Publication Date:
OSTI Identifier:
21020456
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.091301; (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; CP INVARIANCE; MUON NEUTRINOS; NEUTRINO DETECTION; NEUTRINO OSCILLATION; NEUTRINO REACTIONS; STANDARD MODEL

Citation Formats

Goldman, T., Stephenson, G. J. Jr., McKellar, B. H. J., Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, and School of Physics, University of Melbourne, Victoria 3010. Multichannel oscillations and relations between LSND, KARMEN, and MiniBooNE, with and without CP violation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.091301.
Goldman, T., Stephenson, G. J. Jr., McKellar, B. H. J., Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, & School of Physics, University of Melbourne, Victoria 3010. Multichannel oscillations and relations between LSND, KARMEN, and MiniBooNE, with and without CP violation. United States. doi:10.1103/PHYSREVD.75.091301.
Goldman, T., Stephenson, G. J. Jr., McKellar, B. H. J., Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, and School of Physics, University of Melbourne, Victoria 3010. Tue . "Multichannel oscillations and relations between LSND, KARMEN, and MiniBooNE, with and without CP violation". United States. doi:10.1103/PHYSREVD.75.091301.
@article{osti_21020456,
title = {Multichannel oscillations and relations between LSND, KARMEN, and MiniBooNE, with and without CP violation},
author = {Goldman, T. and Stephenson, G. J. Jr. and McKellar, B. H. J. and Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 and School of Physics, University of Melbourne, Victoria 3010},
abstractNote = {We show by examples that multichannel mixing can affect both the parameters extracted from neutrino oscillation experiments, and more general conclusions derived by fitting the experimental data under the assumption that only two channels are involved in the mixing. Implications for MiniBooNE are noted and an example based on maximal CP violation displays profound implications for the two data sets ({nu}{sub {mu}} and {nu}{sub {mu}}) of that experiment.},
doi = {10.1103/PHYSREVD.75.091301},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • This work has attempted to reconcile puzzling neutrino oscillation results from the LSND, KARMEN, and MiniBooNE experiments. We show that the LSND evidence for {nu}{sub {mu}}{yields}{nu}e oscillations, its long-standing disagreement with the results from KARMEN, and the anomalous event excess observed by MiniBooNE in {nu}{sub {mu}} and {nu}{sub {mu}} data could all be explained by the existence of a heavy sterile neutrino ({nu}{sub h}). All these results are found to be consistent with each other, assuming that the {nu}{sub h} is created in {nu}{sub {mu}} neutral-current interactions and decays radiatively into a photon and a light neutrino. Assuming the {nu}{submore » h} is produced through mixing with {nu}{sub {mu}}, the combined analysis of the LSND and MiniBooNe excess events suggests that the {nu}{sub h} mass is in the range from 40 to 80 MeV, the mixing strength is |U{sub {mu}h}|{sup 2{approx_equal}}10{sup -3}-10{sup -2}, and the lifetime is {tau}{sub {nu}{sub h}} < or approx. 10{sup -9} s. Surprisingly, this LSND-MiniBooNE parameter window is found to be unconstrained by the results from the most sensitive experiments. We set new limits on |U{sub {mu}h}|{sup 2} for the favorable mass region from the precision measurements of the Michel spectrum by the TWIST experiment. The results obtained provide a strong motivation for a sensitive search for the {nu}{sub h} in a near future K decay or neutrino experiments, which fit well in the existing and planned experimental programs at CERN or FNAL. The question of whether the heavy neutrino is a Dirac or Majorana particle is briefly discussed.« less
  • 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 resonance structures in CPT and Lorentz symmetry-violating neutrino-antineutrino oscillations in a two generation framework. The neutrino-antineutrino oscillations are induced by Lorentz- and CPT-violating terms in the Hamiltonian. The resonances are suitably described in terms of charge conjugation eigenstates of the system. The relations among the flavor, charge conjugation and mass eigenbasis of neutrino-antineutrino oscillations are examined along with the interplay between the available CPT-violating parameter space and possible resonance structures. Eventually we remark on the consequences of such scenarios for neutrino oscillation experiments, namely, possible solutions for the LSND and MiniBooNE anomalies.
  • The LSND and KARMEN {nu} oscillation experiments are compared in order to clarify the significance of the apparent disagreement between their results.