Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
By M. Aartsen, M. Ackermann, J. Adams, J. Aguilar, M. Ahlers, M. Ahrens, D. Altmann, T. Anderson, C. Arguelles, T. Arlen and 291 more. 2015
188 citations recorded by the source corpus.
A diffuse flux of astrophysical neutrinos above $100\,\mathrm{TeV}$ has been observed at the IceCube Neutrino Observatory. Here we extend this analysis to probe the astrophysical flux down to $35\,\mathrm{TeV}$ and analyze its flavor composition by classifying events as showers or tracks. Taking advantage of lower atmospheric backgrounds for shower-like 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 $(f_e:f_{\mu}:f_\tau)_\oplus\approx(1:1:1)_\oplus$ flavor ratio at Earth commonly expected from the averaged oscillations of neutrinos produced by pion decay in distant astrophysical sources. Limits are placed on non-standard flavor compositions that cannot be produced by averaged neutrino oscillations but could arise in exotic physics scenarios. A maximally track-like composition of $(0:1:0)_\oplus$ is excluded at $3.3\sigma$, and a purely shower-like composition of $(1:0:0)_\oplus$ is excluded at $2.3\sigma$.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/7409e822cf711a064e17e7e915ead1c02da067f3
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In Nuclear and High Energy Physics
Citations in the corpus
- IceCube-Gen2: the window to the extreme Universe (2020, methodology): “data [37, 43, 196] indicate consistency with the benchmark prediction from complete pion decay of νe ∶ νμ ∶ ντ = 1 ∶ 2 ∶ 0 which is transformed to approximately 1:1:1 by neutrino oscillations over astronomical distances [197].”
- All-sky Search for Time-integrated Neutrino Emission from Astrophysical Sources with 7 yr of IceCube Data (2016, methodology): “The second interesting event is a straight down-going starting track at 430 TeV deposited energy(Aartsen et al. 2015f).”
- The Blazar TXS 0506+056 Associated with a High-energy Neutrino: Insights into Extragalactic Jets and Cosmic-Ray Acceleration (2018, methodology): “The muon neutrino fluxes predicted in our model are shown in Figure 2, considering neutrino oscillations into equal fractions among the three flavors during their propagation (Aartsen et al. 2015).”