MINOS Document 8640-v2

Measuring Theta13 via Muon Neutrino to Electron Neutrino Oscillations in the MINOS Experiment

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Ruth B Toner
Updated by:
Ruth B Toner
Document Created:
03 Nov 2011, 11:12
Contents Revised:
03 Nov 2011, 11:15
Metadata Revised:
29 Jan 2014, 17:36
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One of the primary goals in neutrino physics at the present moment is to make a measurement of the neutrino oscillation parameter th13. This parameter, in addition to being unknown, could potentially allow for the introduction of CP violation into the lepton sector. The MINOS long-baseline neutrino oscillation experiment has the ability to make a measurement of this parameter, by looking for the oscillation of muon neutrinos to electron neutrinos between a Near and Far Detector over a distance of 735 km. This thesis discusses the development of an analysis framework to search for this oscillation mode. Two major improvements to pre-existing analysis techniques have been implemented by the author. First, a novel particle ID technique based on strip topology, known as the Library Event Matching (LEM) method, is optimized for use in MINOS. Second, a multiple bin likelihood method is developed to fit the data. These two improvements, when combined, increase MINOS’ sensitivity to sin2(2th13) by 27% over previous analyses. This thesis sees a small excess over background in the Far Detector. A Frequentist interpretation of the data rules out th13 = 0 at 91%. A Bayesian interpretation of the data is also presented, placing the most stringent upper boundary on the oscillation parameter to date, at sin2(2th13) < 0.09(0.015) for the Normal (Inverted) Hierarchy and deltaCP = 0.
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