Departmental Oral Examination (Thesis Title: "An Analysis of the Oscillation of Atmospheric Neutrinos")

Speaker: 
SHIMPEI TOBAYAMA
Event Date and Time: 
Fri, 2016-09-16 14:00 - 17:00
Location: 
Henn 318
Local Contact: 
Physics and Astronomy, UBC
Intended Audience: 
Public

Abstract:
This thesis presents an analysis of the oscillation of atmospheric neutrinos observed in Super-Kamiokande, a large underground water Cherenkov detector in Japan. The observed atmospheric neutrino events are reconstructed and selected using a newly developed maximum likelihood event reconstruction algorithm, and a Markov chain Monte Carlo technique is employed to present the results on neutrino oscillation parameters as marginalized Bayesian posterior probabilities.

The result of analyzing the SK-IV data of 2520 days exposure shows a preference for normal mass hierarchy with the posterior probability of 85.9%, and the mode and the 68% credible interval of each oscillation parameter's marginalized 1D posterior probability distribution for normal hierarchy are sin^{2}\theta_{23}=0.606^{+0.044}_{-0.118} and \Delta m^{2}_{32}=2.13^{+0.17}_{-0.38} x10^-3 eV^2.

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