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@PHDTHESIS{Euler:444944,
author = {Euler, Sebastian},
othercontributors = {Wiebusch, Christopher},
title = {{O}bservation of oscillations of atmospheric neutrinos with
the {I}ce{C}ube {N}eutrino {O}bservatory},
address = {Aachen},
reportid = {RWTH-CONV-145258},
pages = {152 S. : Ill., graph. Darst.},
year = {2014},
note = {Aachen, Techn. Hochsch., Diss., 2014},
abstract = {Neutrino oscillations have become one of the most important
research topics in particle physics since their discovery 15
years ago. In the past, the study of neutrino oscillations
has been largely the domain of dedicated experiments, but in
the last year also the large-volume neutrino telescopes
ANTARES and IceCube reported their results on the
oscillations of atmospheric muon neutrinos and thus joined
the community of experiments studying neutrino oscillations.
The precision of their results is not yet competitive, but
their sheer size and the consequently enormous statistics
give rise to the expectation of a competitive measurement in
the future. This thesis describes an analysis that was done
on IceCube data taken with the nearly complete detector in
the years 2010/2011. IceCube is the world's largest neutrino
detector, located at the geographic South Pole, where it
uses the Antarctic ice sheet as its detection medium. It
detects neutrinos interacting within or close to the
instrumented volume by observing the Cherenkov light which
is emitted by secondary particles produced in these
interactions. An array of optical sensors deployed within a
cubic kilometer of ice detects the Cherenkov light and makes
it possible to reconstruct the energy and direction of the
initial neutrino. Unfortunately, IceCube detects not only
neutrinos: the desired neutrino signal is buried in a huge
background of atmospheric muons, produced in air showers
induced by cosmic rays. This background has to be rejected
first. The analysis presented here employs an event
selection that is based on the idea of using the outer
layers of IceCube as an active veto against the background
of atmospheric muons and achieves the necessary background
rejection of more than 6 orders of magnitude while keeping a
high-statistics sample of several thousands of muon
neutrinos. In contrast to the earlier IceCube analysis,
which used only the zenith angle, it then performs a
2-dimensional likelihood fit on reconstructed zenith angle
and energy and improves upon the earlier measurement of the
mixing angle and mass difference. The techniques developed
for this analysis are expected to facilitate a competitive
measurement of the oscillation parameters in the near
future.},
keywords = {Elementarteilchenphysik (SWD) / Neutrino (SWD) /
Neutrinooszillation (SWD)},
cin = {130000 / 133510},
ddc = {530},
cid = {$I:(DE-82)130000_20140620$ / $I:(DE-82)133510_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-50897},
url = {https://publications.rwth-aachen.de/record/444944},
}
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