Search for astrophysical tau neutrinos in three years of IceCube data

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dc.contributor Toale, Patrick A.
dc.contributor Piepke, Andreas
dc.contributor Okada, Nobuchika
dc.contributor Bao, Yuping
dc.contributor.advisor Williams, Dawn R.
dc.contributor.author Xu, Donglian
dc.date.accessioned 2017-03-01T17:23:25Z
dc.date.available 2017-03-01T17:23:25Z
dc.date.issued 2015
dc.identifier.other u0015_0000001_0001906
dc.identifier.other Xu_alatus_0004D_12324
dc.identifier.uri https://ir.ua.edu/handle/123456789/2332
dc.description Electronic Thesis or Dissertation
dc.description.abstract High-energy cosmic neutrinos are expected to be produced in extremely energetic astrophysical sources such as active galactic nuclei (AGNs) and gamma ray bursts (GRBs). The IceCube Neutrino Observatory has recently detected a diffuse astrophysical neutrino flux at 5.7σ significance. One of the outstanding questions regarding astrophysical neutrinos is their flavor composition. Most standard oscillation scenarios predict tau neutrinos (υ_τ) in the astrophysical flux, which have a negligible background from cosmic ray induced atmospheric neutrinos. This work reports a search for high-energy astrophysical υ_τ with the IceCube neutrino observatory. This analysis has devised a new method to search for astrophysical υ_τ in the IceCube waveforms, and it is the first υ_τ analysis in IceCube that is more sensitive to a υ_τ flux than other neutrino flavors. A total of three years of data was used, yielding a sensitivity of 5.1 x 10^-8 GeV cm^-2 s^-1 sr^-1 near the PeV region assuming a flux limit of E^2 Φ_υ < 1.0 x 10^-8 GeV cm^-2 s^-1 sr^-1 per neutrino flavor. Zero events were found. Differential upper limits for astrophysical υ_τ are derived in the Ο(100) TeV to Ο(10) PeV regime based on the zero findings.
dc.format.extent 178 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Astrophysics
dc.subject.other Particle physics
dc.title Search for astrophysical tau neutrinos in three years of IceCube data
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Physics and Astronomy
etdms.degree.discipline Physics
etdms.degree.grantor The University of Alabama
etdms.degree.level doctoral
etdms.degree.name Ph.D.


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