Dissertation/Thesis Abstract

Observation of νe appearance from an off-axis ν μ beam utilizing the neutrino energy spectrum
by Hignight, Joshua, Ph.D., State University of New York at Stony Brook, 2014, 154; 3637680
Abstract (Summary)

T2K (Tokai to Kamiokande) is a long baseline neutrino experiment located in Japan. It uses a 30 GeV proton beam at the J-PARC accelerator in Tokai to produce an intense off-axis muon neutrino beam that travels 295 km through the Earth to Super-Kamiokande. One of its primary goals is to measure neutrino oscillation parameters by directly detecting νe at Super-Kamiokande that have oscillated from the νμ beam. The measurement of νμ → νe oscillations are of a particular interest because this mode is sensitive to both mixing angle &thetas; 13 and CP phase δCP of the PMNS matrix. Precise measurement of νμ → νe allows us to explore the possibility of CP violation in the lepton sector.

This dissertation will describe the recent 2013 νe appearance oscillation analysis using the reconstructed neutrino energy spectrum by means of a maximum likelihood fit. The data used for this analysis corresponds to 6.57 × 1020 POT. A total of 28 ν e candidate events were observed, corresponding to a 7.2 σ significance of νe appearance by non-zero &thetas;13. These results are then combined with the world average value of &thetas;13 from reactor experiments and some values of δCP are disfavored at the 90% CL.

Indexing (document details)
Advisor: Jung, Chang Kee
Commitee: Calder, Alan C., Tsybychev, Dmitri, Viren, Brett
School: State University of New York at Stony Brook
Department: Physics
School Location: United States -- New York
Source: DAI-B 76/02(E), Dissertation Abstracts International
Subjects: Particle physics
Keywords: Neutrino
Publication Number: 3637680
ISBN: 978-1-321-20650-0
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