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Phenomenological Studies of Neutrinos
Stockholm University, Faculty of Science, Department of Physics.
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Department of Physics, Stockholm University , 2017. , p. 36
National Category
Subatomic Physics
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:su:diva-143296OAI: oai:DiVA.org:su-143296DiVA, id: diva2:1097846
Presentation
2017-06-09, FB54, AlbaNova universitetscentrum, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-09-15Bibliographically approved
List of papers
1. On the determination of the leptonic CP phase
Open this publication in new window or tab >>On the determination of the leptonic CP phase
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, article id 016Article in journal (Refereed) Published
Abstract [en]

The combination of data from long-baseline and reactor oscillation experiments leads to a preference of the leptonic CP phase delta(CP) in the range between pi and 2 pi. We study the statistical significance of this hint by performing a Monte Carlo simulation of the relevant data. We find that the distribution of the standard test statistic used to derive confidence intervals for delta(CP) is highly non-Gaussian and depends on the unknown true values of theta(23) and the neutrino mass ordering. Values of delta(CP) around pi/2 are disfavored at between 2 sigma and 3 sigma, depending on the unknown true values of theta(23) and the mass ordering. Typically the standard chi(2) approximation leads to over-coverage of the confidence intervals for delta(CP). For the 2-dimensional confidence region in the (delta(CP), theta(23)) plane the usual chi(2) approximation is better justified. The 2-dimensional region does not include the value delta(CP) = pi/2 up to the 86.3% (89.2%) CL assuming a true normal (inverted) mass ordering. Furthermore, we study the sensitivity to delta(CP) and theta(23) of an increased exposure of the T2K experiment, roughly a factor 12 larger than the current exposure and including also anti-neutrino data. Also in this case deviations from Gaussianity may be significant, especially if the mass ordering is unknown.

Keywords
Neutrino Physics, CP violation
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-123347 (URN)10.1007/JHEP09(2015)016 (DOI)000363534500007 ()
Available from: 2015-11-25 Created: 2015-11-24 Last updated: 2017-12-01Bibliographically approved

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Citation style
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