MINOS Document 3673-v1

An Optimised Oscillation Analysis of MINOS Beam Data

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Mark A Thomson
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Mark A Thomson
Document Created:
29 Sep 2007, 04:58
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29 Sep 2007, 04:58
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16 Jan 2009, 16:41
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This thesis presents results of the MINOS long baseline neutrino oscillation experiment. Charged Current interactions of numu from the NuMI beamline have been recorded in both the Near and Far Detectors between May 2005 and February 2006, corresponding to 1.27E20 protons being delivered to the NuMI target. Several techniques for improving the sensitivity of an oscillation measurement are discussed and their impact assessed. 378 events are observed in the Far Detector during this period, compared to a prediction of 459+-31 events when the observed Near Detector spectrum is extrapolated to the Far Detector over the 735 km baseline with no oscillations. In addition to this deficit of observed events, there is also evidence for spectral distortion in the Far Detector. A maximum likelihood analysis is used to determine the best fit point and allowed regions in Deltamsq and Sin2Theta parameter space. The best fit values for Deltamsq and Sin2Theta are found to be (2.55+0.39-0.24)x10^{-3} eV^2 and >0.87 (68\% C.L.) respectively.
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