A measurement of the electron neutrino component of the T2K beam using the near detector
Whitehead, Leigh (2012) A measurement of the electron neutrino component of the T2K beam using the near detector. PhD thesis, University of Warwick.
WRAP_THESIS_Whitehead_2012.pdf - Submitted Version
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Official URL: http://webcat.warwick.ac.uk/record=b2585472~S1
T2K is a long baseline neutrino oscillation experiment located in Japan, with a
295km baseline and peak neutrino energy of 0:6 GeV. It is the first off-axis neutrino
experiment where the beam is directed approximately 2.5° away from the detectors
in order to produce a narrow-band neutrino beam. The experiment was designed to
measure the mixing angle θ13 by measuring the neutrino oscillation process vμ -> ve. This measurement relies on the detection of electrons at the far detector from
oscillations, and so it is vital to understand the size of the intrinsic ve component
of the beam.
A measurement of the intrinsic ve component of the T2K beam was performed
using the ND280. An analysis that used all of the data taken by the ND280 from
February 2010 until March 2011, a total of 1.09 x 10^20 POT, measured 67.7 +-
12.9(stat) +- 5.2(syst) CC ve interactions. The number of events corresponds to a
ratio between data and simulation of 0.983+-0.191(stat)+-0.076(syst) and provides
strong evidence that the neutrino flux is well simulated.
The simulation from the intrinsic ve measurement was then combined with
an analysis of vμ interactions in the ND280 to constrain the neutrino flux uncertainties.
An idealised study that considered only statistical and flux systematic
uncertainties concluded that the intrinsic ve analysis improved the constraint on the
flux uncertainties compared to considering only the ND280 vμ analyses, with the
effect most prominent at neutrino energies greater than 1 GeV.
|Item Type:||Thesis or Dissertation (PhD)|
|Subjects:||Q Science > QC Physics|
|Library of Congress Subject Headings (LCSH):||Neutrinos|
|Official Date:||September 2012|
|Institution:||University of Warwick|
|Theses Department:||Department of Physics|
|Supervisor(s)/Advisor:||Barker, Gary John ; Boyd, Steven B.|
|Extent:||xiii, 156 leaves : illustrations, charts|
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