A Search for Tau Neutrino Appearance with IceCube-DeepCore
Neutrino have been known to oscillate between the three flavors since the first discoveries two decades ago. Over that time, our knowledge of the parameters which govern these oscillations has improved significantly. The largest remaining uncertainties in the measurement of neutrino oscillations are...
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The Niels Bohr Institute, Faculty of Science, University of Copenhagen
2018
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ftcopenhagenunip:oai:pure.atira.dk:publications/a5c12ee1-3f7a-4ca3-a934-a0ddb0e62929 2023-05-15T13:54:12+02:00 A Search for Tau Neutrino Appearance with IceCube-DeepCore Larson, Michael James 2018 https://curis.ku.dk/portal/da/publications/a-search-for-tau-neutrino-appearance-with-icecubedeepcore(a5c12ee1-3f7a-4ca3-a934-a0ddb0e62929).html https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122547562405763 eng eng The Niels Bohr Institute, Faculty of Science, University of Copenhagen info:eu-repo/semantics/closedAccess Larson , M J 2018 , A Search for Tau Neutrino Appearance with IceCube-DeepCore . The Niels Bohr Institute, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122547562405763 > book 2018 ftcopenhagenunip 2021-09-23T18:12:47Z Neutrino have been known to oscillate between the three flavors since the first discoveries two decades ago. Over that time, our knowledge of the parameters which govern these oscillations has improved significantly. The largest remaining uncertainties in the measurement of neutrino oscillations are those that govern the tau neutrino. In this thesis, a direct measurement of tau neutrino oscillations is performed with the IceCube Neutrino Observatory located in the ice deep beneath the South Pole. The measurement of atmospheric tau neutrino appearance requires a precise understanding of backgrounds. In order to perform the measurement, improvements to the modeling of the detector noise have been performed, reducing the uncertainties in the noise model used in IceCube significantly. Additional improvements to the simulation efficiency investigated during this thesis reduce the computational requirements of atmospheric muon background events by more than three orders of magnitude. These improvements allow, for the first time, the use of simulation of background events in oscillation measurements performed by IceCube. Using the DeepCore detector, a densely instrumented infill of IceCube located in the clearest ice of the Antarctic glacier, a new selection of events has been created in the search for tau neutrino appearance from atmospheric oscillations. Tau neutrino appearance and muon neutrino disappearance were measured simultaneously with the new sample from 5.6 to 56 GeV from data collected over a period of 968 days. The best fit values, NCC = 0.566+0.356 −0.303 for the charged current exclusive channel and NNC+CC = 0.733+0.305 −0.243 for the neutral current inclusive channel, improve upon previous measurements set by other experiments Book Antarc* Antarctic South pole South pole University of Copenhagen: Research Antarctic South Pole The Antarctic |
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University of Copenhagen: Research |
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ftcopenhagenunip |
language |
English |
description |
Neutrino have been known to oscillate between the three flavors since the first discoveries two decades ago. Over that time, our knowledge of the parameters which govern these oscillations has improved significantly. The largest remaining uncertainties in the measurement of neutrino oscillations are those that govern the tau neutrino. In this thesis, a direct measurement of tau neutrino oscillations is performed with the IceCube Neutrino Observatory located in the ice deep beneath the South Pole. The measurement of atmospheric tau neutrino appearance requires a precise understanding of backgrounds. In order to perform the measurement, improvements to the modeling of the detector noise have been performed, reducing the uncertainties in the noise model used in IceCube significantly. Additional improvements to the simulation efficiency investigated during this thesis reduce the computational requirements of atmospheric muon background events by more than three orders of magnitude. These improvements allow, for the first time, the use of simulation of background events in oscillation measurements performed by IceCube. Using the DeepCore detector, a densely instrumented infill of IceCube located in the clearest ice of the Antarctic glacier, a new selection of events has been created in the search for tau neutrino appearance from atmospheric oscillations. Tau neutrino appearance and muon neutrino disappearance were measured simultaneously with the new sample from 5.6 to 56 GeV from data collected over a period of 968 days. The best fit values, NCC = 0.566+0.356 −0.303 for the charged current exclusive channel and NNC+CC = 0.733+0.305 −0.243 for the neutral current inclusive channel, improve upon previous measurements set by other experiments |
format |
Book |
author |
Larson, Michael James |
spellingShingle |
Larson, Michael James A Search for Tau Neutrino Appearance with IceCube-DeepCore |
author_facet |
Larson, Michael James |
author_sort |
Larson, Michael James |
title |
A Search for Tau Neutrino Appearance with IceCube-DeepCore |
title_short |
A Search for Tau Neutrino Appearance with IceCube-DeepCore |
title_full |
A Search for Tau Neutrino Appearance with IceCube-DeepCore |
title_fullStr |
A Search for Tau Neutrino Appearance with IceCube-DeepCore |
title_full_unstemmed |
A Search for Tau Neutrino Appearance with IceCube-DeepCore |
title_sort |
search for tau neutrino appearance with icecube-deepcore |
publisher |
The Niels Bohr Institute, Faculty of Science, University of Copenhagen |
publishDate |
2018 |
url |
https://curis.ku.dk/portal/da/publications/a-search-for-tau-neutrino-appearance-with-icecubedeepcore(a5c12ee1-3f7a-4ca3-a934-a0ddb0e62929).html https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122547562405763 |
geographic |
Antarctic South Pole The Antarctic |
geographic_facet |
Antarctic South Pole The Antarctic |
genre |
Antarc* Antarctic South pole South pole |
genre_facet |
Antarc* Antarctic South pole South pole |
op_source |
Larson , M J 2018 , A Search for Tau Neutrino Appearance with IceCube-DeepCore . The Niels Bohr Institute, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122547562405763 > |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1766259883742593024 |