Neutrino induced events in the MINOS detectors Page: 3 of 161
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Neutrino induced events in the
Reuben Phillip Litchfield
Keble College, Oxford
Thesis submitted in partial fulfilment of the requirements
for the degree of Doctor of Philosophy
at the University of Oxford.
Hilary Term, 2008
The MINOS experiment is designed to study neutrino oscillations. It uses an ac-
celerator generated beam of neutrinos and two detectors, the smaller at a distance
of 1 km and the larger at 735 km. By comparing the spectrum and flavour com-
position of the beam at the two detectors precise determinations of the oscillation
parameters are possible.
This thesis concentrates on the analysis of data from the larger Far Detector.
By studying the spectrum of neutral current events it is possible to look for ev-
idence of non-interacting 'sterile' neutrinos. The thesis describes how events are
selected for this analysis, and a method for discriminating between charged cur-
rent and neutral current events. The systematic uncertainties resulting from these
cuts are evaluated. Several techniques for using Near Detector data to eliminate
systematic uncertainties in the predicted Far Detector spectrum are compared.
An oscillation analysis, based on the first year of MINOS data, uses the selected
events to make a measurement of fs, the fraction of unseen neutrinos that are
sterile. The measured value is fs = 0.07+032 at 68%C.L. , and is consistent with
the standard three-neutrino picture, which has no sterile neutrino.
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Litchfield, Reuben Phillip. Neutrino induced events in the MINOS detectors, thesis or dissertation, March 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc901378/m1/3/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.