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CP violation and neutrino mass ordering at the T2K experiment

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Chappell, Andrew (2019) CP violation and neutrino mass ordering at the T2K experiment. PhD thesis, University of Warwick.

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Official URL: http://webcat.warwick.ac.uk/record=b3442328~S15

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Abstract

T2K is a long baseline neutrino oscillation experiment studying the oscillation of Vμ to Ve over the 295 km baseline between the J-PARC accelerator and the Super-Kamiokande water Cherenkov detector.

A 3-flavour, 5 sample v/v joint analysis on the Run 1-9 dataset is performed to measure the neutrino CP phase, ꝺ, where values other than zero and nπ imply a difference in the oscillation of neutrinos and antineutrinos. The 2σ confidence level allowed interval when applying the constraint on sin2(Ɵ13) from reactors in normal mass ordering is [-2:966;-0:628] and for inverted mass ordering is [-1:799;-0:979]. Thus, CP conservation is rejected at 2σ, a world leading measurement.

Differences in event rates are expected for different true values of the neutrino mass ordering and thus T2K has some sensitivity to the neutrino mass ordering. A 3-flavour, 5 sample v/v joint analysis on the Run 1-9 dataset is performed to measure the neutrino mass ordering. No strong evidence against either mass ordering hypothesis is observed.

Item Type: Thesis or Dissertation (PhD)
Subjects: Q Science > QC Physics
Library of Congress Subject Headings (LCSH): CP violation (Nuclear physics), Neutrinos -- Mass, Oscillations -- Measurement
Official Date: April 2019
Dates:
DateEvent
April 2019UNSPECIFIED
Institution: University of Warwick
Theses Department: Department of Physics
Thesis Type: PhD
Publication Status: Unpublished
Supervisor(s)/Advisor: Barker, Gary John ; Boyd, Steve B.
Format of File: pdf
Extent: xxiv, 163 leaves : illustrations, charts
Language: eng

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