Journal article
Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
Physical review letters, v 114(17), pp 171102-171102
2015
PMID: 25978221
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A diffuse flux of astrophysical neutrinos above 100 TeV has been observed at the IceCube Neutrino Observatory. Here we extend this analysis to probe the astrophysical flux down to 35 TeV and analyze its flavor composition by classifying events as showers or tracks. Taking advantage of lower atmospheric backgrounds for showerlike events, we obtain a shower-biased sample containing 129 showers and 8 tracks collected in three years from 2010 to 2013. We demonstrate consistency with the (f(e) : f(mu) : f(tau))(circle plus) approximate to (1 : 1 : 1)(circle plus) flavor ratio at Earth commonly expected from the averaged oscillations of neutrinos produced by pion decay in distant astrophysical sources. Limits are placed on nonstandard flavor compositions that cannot be produced by averaged neutrino oscillations but could arise in exotic physics scenarios. A maximally tracklike composition of (0 : 1 : 0)(circle plus) is excluded at 3.3 sigma, and a purely showerlike composition of (1 : 0 : 0)(circle plus) is excluded at 2.3 sigma.
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Details
- Title
- Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
- Creators
- Maryon Ahrens - Oskar Klein-centrum för kosmopartikelfysik (OKC)Christian Bohm - Stockholm UniversityJonathan P. Dumm - Stockholm UniversityChad Finley - Stockholm UniversitySamuel Flis - Stockholm UniversityPer Olof Hulth - Stockholm UniversityKlas Hultqvist - Stockholm UniversityChristian Walck - Stockholm UniversityMartin Wolf - Oskar Klein-centrum för kosmopartikelfysik (OKC)Marcel Zoll - Stockholm UniversityIceCube Collaboration
- Publication Details
- Physical review letters, v 114(17), pp 171102-171102
- Publisher
- Cold Spring Harbor Press
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000353547100004
- Scopus ID
- 2-s2.0-84930226137
- Other Identifier
- 991019168790304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Multidisciplinary