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Title: Searches for New Physics at MiniBooNE: Sterile Neutrinos and Mixing Freedom

Abstract

The MiniBooNE experiment was designed to perform a search for v μ → v e oscillations in a region of Δm 2 and sin 2 2θ very different from that allowed by standard, three-neutrino oscillations, as determined by solar and atmospheric neutrino experiments. This search was motivated by the LSND experimental observation of an excess of $$\bar{v}$$ e events in a $$\bar{v}$$ μ beam which was found compatible with two-neutrino oscillations at Δm 2 ~ 1 eV 2 and sin 2 2{theta} < 1%. If confirmed, such oscillation signature could be attributed to the existence of a light, mostly-sterile neutrino, containing small admixtures of weak neutrino eigenstates. In addition to a search for v μ → v e oscillations, MiniBooNE has also performed a search for v μ → v e oscillations, which provides a test of the LSND two-neutrino oscillation interpretation that is independent of CP or CPT violation assumptions. This dissertation presents the MiniBooNE v μ → v e and v μ → v e analyses and results, with emphasis on the latter. While the neutrino search excludes the two-neutrino oscillation interpretation of LSND at 98% C.L., the antineutrino search shows an excess of events which is in agreement with the two-neutrino v μ → v e oscillation interpretation of LSND, and excludes the no oscillations hypothesis at 96% C.L. Even though the neutrino and antineutrino oscillation results from MiniBooNE disagree under the single sterile neutrino oscillation hypothesis, a simple extension to the model to include additional sterile neutrino states and the possibility of CP violation allows for differences between neutrino and antineutrino oscillation signatures. In view of that, the viability of oscillation models with one or two sterile neutrinos is investigated in global fits to MiniBooNE and LSND data, with and without constraints from other oscillation experiments with similar sensitivities to those models. A general search for new physics scenarios which would lead to effective non-unitarity of the standard 3 x 3 neutrino mixing matrix, or mixing freedom, is also performed using neutrino and antineutrino data available from MiniBooNE.

Authors:
 [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1000269
Report Number(s):
FERMILAB-THESIS-2010-39
TRN: US1100077
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; NEUTRINO OSCILLATION; MUON NEUTRINOS; ELECTRON NEUTRINOS; ELECTRON ANTINEUTRINOS; MUON ANTINEUTRINOS; EIGENSTATES; CP INVARIANCE; MATHEMATICAL MODELS; Experiment-HEP

Citation Formats

Karagiorgi, Georgia S. Searches for New Physics at MiniBooNE: Sterile Neutrinos and Mixing Freedom. United States: N. p., 2010. Web. doi:10.2172/1000269.
Karagiorgi, Georgia S. Searches for New Physics at MiniBooNE: Sterile Neutrinos and Mixing Freedom. United States. doi:10.2172/1000269.
Karagiorgi, Georgia S. Wed . "Searches for New Physics at MiniBooNE: Sterile Neutrinos and Mixing Freedom". United States. doi:10.2172/1000269. https://www.osti.gov/servlets/purl/1000269.
@article{osti_1000269,
title = {Searches for New Physics at MiniBooNE: Sterile Neutrinos and Mixing Freedom},
author = {Karagiorgi, Georgia S.},
abstractNote = {The MiniBooNE experiment was designed to perform a search for vμ → ve oscillations in a region of Δm2 and sin2 2θ very different from that allowed by standard, three-neutrino oscillations, as determined by solar and atmospheric neutrino experiments. This search was motivated by the LSND experimental observation of an excess of $\bar{v}$e events in a $\bar{v}$μ beam which was found compatible with two-neutrino oscillations at Δm2 ~ 1 eV2 and sin2 2{theta} < 1%. If confirmed, such oscillation signature could be attributed to the existence of a light, mostly-sterile neutrino, containing small admixtures of weak neutrino eigenstates. In addition to a search for vμ → ve oscillations, MiniBooNE has also performed a search for vμ → ve oscillations, which provides a test of the LSND two-neutrino oscillation interpretation that is independent of CP or CPT violation assumptions. This dissertation presents the MiniBooNE vμ → ve and vμ → ve analyses and results, with emphasis on the latter. While the neutrino search excludes the two-neutrino oscillation interpretation of LSND at 98% C.L., the antineutrino search shows an excess of events which is in agreement with the two-neutrino vμ → ve oscillation interpretation of LSND, and excludes the no oscillations hypothesis at 96% C.L. Even though the neutrino and antineutrino oscillation results from MiniBooNE disagree under the single sterile neutrino oscillation hypothesis, a simple extension to the model to include additional sterile neutrino states and the possibility of CP violation allows for differences between neutrino and antineutrino oscillation signatures. In view of that, the viability of oscillation models with one or two sterile neutrinos is investigated in global fits to MiniBooNE and LSND data, with and without constraints from other oscillation experiments with similar sensitivities to those models. A general search for new physics scenarios which would lead to effective non-unitarity of the standard 3 x 3 neutrino mixing matrix, or mixing freedom, is also performed using neutrino and antineutrino data available from MiniBooNE.},
doi = {10.2172/1000269},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {9}
}

Thesis/Dissertation:
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